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A Boeing B-17, Duchess' Daughter, after a belly landing. (6 July 1944)

A belly landing or gear-up landing occurs when an aircraft lands without its landing gear fully extended and uses its underside, or belly, as its primary landing device. Normally the term gear-up landing refers to incidents in which the pilot forgets to extend the landing gear, while belly landing refers to incidents where a mechanical malfunction prevents the pilot from extending the landing gear.

During a belly landing, there is normally extensive damage to the airplane. Belly landings carry the risk that the aircraft may flip over, disintegrate, or catch fire if it lands too fast or too hard. Extreme precision is needed to ensure that the plane lands as straight and level as possible while maintaining enough airspeed to maintain control. Strong crosswinds, low visibility, damage to the airplane, or unresponsive instruments or controls greatly increase the danger of performing a belly landing. Belly landings are one of the most common types of aircraft accidents nevertheless, and are normally not fatal if executed carefully.[clarification needed][citation needed]

Causes and prevention

[edit]

Pilot error

[edit]
A C-17 Globemaster after a belly-landing at Bagram Airfield, Afghanistan (2009). The cause of this was later determined to be pilot error.[1][2]

The most common cause of gear-up landings is the pilot simply forgetting to extend the landing gear before touchdown. On any retractable gear aircraft, lowering the landing gear is part of the pilot's landing checklist, which also includes items such as setting the flaps, propeller and mixture controls for landing. Pilots who ritually perform such checklists before landing are less likely to land gear-up. However, some pilots neglect these checklists and perform the tasks by memory, increasing the chances of forgetting to lower the landing gear. Even careful pilots are at risk, because they may be distracted and forget to perform the checklist or be interrupted in the middle of it by other duties such as collision avoidance or another emergency. In the picture shown above, the B-17 Dutchess' Daughter had landed normally, when the copilot inadvertently flipped the landing gear switch to retract. The gear collapsed near the end of the landing roll.[3]

All aircraft with retractable landing gear are required to have a way to indicate the status of the landing gear, which is normally a set of lights that change colors from red to amber to green depending on whether the gear are up, in transit, or down. However, a distracted pilot may forget to look at these lights. This has led to aircraft designers building extra safety systems in the aircraft to reduce the possibility of human error. In small aircraft this most commonly takes the form of a warning light and horn which operate when any of the landing gear is not locked down and any of the engine throttles are retarded below a cruise power setting. However, the horn has been useless in situations when the pilot was unfamiliar with the aircraft and did not know what the horn sounding was meant to indicate. Pilots have sometimes confused the landing gear warning horn with the stall warning horn. In other cases, pilots cannot hear the horn on older aircraft due to wearing a modern noise-canceling headset.

In 1951, Eastern Airlines Flight 601 operated by a Lockheed L-749 Constellation performed a successful belly landing at Curles Neck Farm in Virginia during a storm.

In larger aircraft, the warning system usually excludes the engine power setting and instead warns the pilot when the flaps are set for landing but the landing gear is not. An alternative system uses the ground proximity warning system or radar altimeter to engage a warning when the airplane is close to the ground and descending with the gear not down. Most airliners incorporate a voice message system which eliminates the ambiguity of a horn or buzzer and instead gives the pilot a clear verbal indication: "GEAR NOT DOWN". In addition, large aircraft are designed to be operated by two pilots working as a team. One flies the aircraft and handles communications and collision avoidance, while the other operates the aircraft systems. This provides a sort of human redundancy which reduces the workload placed on any one crew member, and provides for one crew member to be able to check the work of the other. The combination of advanced warning systems and effective crew training has made gear-up landing accidents in large aircraft extremely rare.

In some cases, the pilot may be warned of an unsafe gear condition by the aircraft's flying characteristics. Often very sleek, high-performance airplanes will be very difficult to slow to a safe landing speed without the aerodynamic drag of the extended landing gear.[citation needed]

Mechanical failure

[edit]
An A-10 after a belly landing at Edwards Air Force Base (2008)

Mechanical failure is another cause of belly landings. Most landing gear are operated by electric motors or hydraulic actuators. Multiple redundancies are usually provided to prevent a single failure from failing the entire landing gear extension process. Whether electrically or hydraulically operated, the landing gear can usually be powered from multiple sources. In case the power system fails, an emergency extension system is always available. This may take the form of a manually operated crank or pump, or a mechanical free-fall mechanism which disengages the uplocks and allows the landing gear to fall and lock due to gravity and/or airflow.

In cases where only one landing gear leg fails to extend, the pilot may choose to retract all the gear and perform a belly landing because he or she may believe it to be easier to control the aircraft during rollout with no gear at all than with one gear missing.

Some aircraft, like the A-10 Thunderbolt II, are specifically designed to make belly landings safer. In the A-10's case, the retracted main wheels protrude out of their nacelles, so the plane virtually rolls on belly landings.

Unmanned belly landings

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The Cornfield Bomber, prior to recovery from its landing site (1970)

There are examples of aircraft making comparatively successful belly landings after being abandoned by their crew in flight.

A German Junkers Ju 88 bomber, after an attack on Soviet shipping in April 1942, was abandoned by its crew and came down on a hillside at Garddevarre in Finnmark in the far north of Norway. It was recovered in 1988 and is currently displayed at the Norsk Luftfartsmuseum, the Norwegian Aviation Museum at Bodø Airport.[4]

On 27 September 1956 a Bell X-2 experimental aircraft, after establishing an airspeed record of Mach 3.2, landed unmanned in the desert after a series of stalls and glides. It was deemed only superficially damaged, breaking up into three pieces on impact. The pilot had used his escape system at about 40,000 ft (12,000 m) after losing control of the aircraft. He was killed when his capsule hit the desert.[5]

Possibly the most well-known is a United States Air Force Convair F-106 Delta Dart, tail number 58-0787. In February 1970, the aircraft entered a flat spin over Montana. Following the pilot ejecting, the aircraft's spin stabilised, and the Delta Dart proceeded to fly for several miles until it came down in a field near Big Sandy, Montana. The aircraft (later nicknamed the Cornfield Bomber) was repaired and returned to service. After the F-106 was withdrawn from service, the aircraft was presented to the National Museum of the United States Air Force.[6]

Examples

[edit]

On 29 September 1940, during the 1940 Brocklesby mid-air collision, two Avro Ansons became wedged together after colliding, one on top of the other. Both of the upper aircraft's engines had been knocked out in the collision but those of the one below continued to turn at full power. The pilot of the lower Anson was injured and bailed out, but the pilot of the upper Anson, Leonard Graham Fuller, found that he was able to control the piggybacking pair of aircraft with his ailerons and flaps. He managed to travel 8 kilometres (5 mi) after the collision before making a successful emergency belly landing in a large paddock 6 kilometres (4 mi) south-west of Brocklesby, New South Wales, Australia.

On 13 June 1991, Korean Air Flight 376 (HL7350), a Boeing 727 operating a domestic flight from Jeju to Daegu, performed an unexpected gear-up landing at Daegu. The crew failed to read out the landing procedure checklist and therefore did not select the gear down option. Subsequent investigation revealed that the pilot instructed the co-pilot to pull the fuse case from the warning system because the repeated warnings that the landing gear was not deployed were "irritating and distracting". With the warning horn disabled, the South Korean pilot brought the plane in and slid down the length of the runway on the central structural rib in the belly of the aircraft. There were no serious injuries but the aircraft was written off.[7]

On 4 July 2000, Malév Flight 262, a Tupolev Tu-154, accidentally performed a gear-up touchdown during the landing and skidded on the runway, but was able to take off and land normally after a go-around. No injuries were reported.[8][9]

On 9 April 2006, a Canadair CL-215 water bomber sold by Buffalo Airways to the Turkish government belly landed on the runway at İzmir Adnan Menderes Airport when the Turkish pilots did not put the landing gear down. The hull was damaged in the crash and there were no injuries, but Buffalo had to fly in new drop doors to replace the ones damaged in the crash. [10]

On 8 May 2006, a United States Air Force B-1 Lancer strategic bomber landed on the atoll of Diego Garcia in the Indian Ocean without lowering its undercarriage.[11] A fire ensued, but was extinguished with only minor personnel injuries. The pilots had reportedly switched off the warning system that would have warned them of the oversight and overlooked the red warning light on the instrument panel throughout the landing. The aircraft, after nearly $8 million in repairs, was returned to service the following year.

On 1 November 2011, LOT Polish Airlines Flight 16, a Boeing 767, Captain Tadeusz Wrona declared an emergency with a loss of landing gear en route from Newark Liberty International Airport to Warsaw Chopin Airport. The aircraft involved was the newest 767 airframe in the fleet. It made a belly landing in Warsaw with a small fire, but all passengers and crew were evacuated with no injuries. The airport was closed for over a day afterwards.[12]

On 22 May 2020, Pakistan International Airlines Flight 8303, an Airbus A320, made a belly landing with landing gear not deployed due to pilot error. Though the crew attempted to perform a go-around, the belly landing had damaged both engines, which failed after the go-around. The plane crashed into a densely populated residential area near Karachi Jinnah International Airport, killing 97 of 99 people aboard, as well as one on the ground.

On 5 October 2023, FedEx Flight 1376, a Boeing 757 taking off from Chattanooga Metropolitan Airport headed for Memphis International Airport, was forced to return and conduct a belly landing after its gear was unable to lower. It skidded off the runway, with no injuries to the crew onboard.[13]

On 29 December 2024, Jeju Air Flight 2216, a Boeing 737-800 landing at Muan Airport in South Korea was forced to conduct a belly landing after what some reports currently suggest may have been a landing gear failure following a reported bird strike. The aircraft failed to stop on the runway, hitting a raised earthwork embankment and bursting into flames, killing 179 out of 181 onboard.[14][15]

On January 27, 2026, N927NA, a Martin/General Dynamics WB-57F Canberra operated by NASA was forced to perform a belly landing at Ellington Field Joint Reserve Base due to a mechanical issue. Both crew members onboard survived with no injuries.[16] The aircraft sustained significant damage, however it is unknown if it will be repaired or not[17]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Belly landing

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A belly landing, also known as a gear-up landing, is an emergency aviation procedure in which an aircraft touches down without its landing gear fully extended, relying on the fuselage underside, or belly, to make contact with the ground or runway surface.[1] This maneuver is most often necessitated by landing gear malfunction, such as failure to extend or lock due to hydraulic, electrical, or mechanical issues, though pilots may also opt for it intentionally in scenarios like off-airport forced landings to minimize risks to occupants.[2] Belly landings are classified as precautionary or forced emergency landings, distinct from ditching on water, and prioritize aircraft survivability by using expendable structures like wings and fuselage to absorb impact energy.[1] Pilots prepare by selecting a suitable airport with rescue and firefighting services, jettisoning excess fuel to reduce fire hazards and weight, deactivating non-essential electrical systems, and configuring the aircraft for the lowest controllable airspeed with full flaps if feasible.[1] The approach involves a shallow descent angle, wings level to avoid propeller strikes in fixed-gear aircraft, and a nose-high attitude at touchdown to distribute drag evenly across the belly, propellers, and wings.[1] Air traffic controllers support this by declaring a full emergency, clearing runways, and alerting ground services for immediate post-landing response.[2] Key risks include structural damage from high sink rates or uneven contact, potential sparks on hard surfaces igniting leaking fuel, and post-impact fires, which modern aircraft mitigate through fire-resistant materials, self-sealing fuel tanks, and rapid evacuation designs.[1] While belly landings often result in the aircraft being written off due to extensive underside abrasion and component deformation, they have historically enabled survivability for crews and passengers when executed properly on prepared runways, due to design features prioritizing occupant protection.[1] Human factors, such as forgetting to extend gear during routine operations, can also lead to unintentional belly landings, though these are not deemed emergencies unless complications arise.[2]

Definition and Overview

Definition

A belly landing, also known as a gear-up landing, occurs when a fixed-wing aircraft touches down without its landing gear fully extended, causing the fuselage or underside to make contact with the ground or runway surface.[1][3] This contrasts with a standard landing, where the gear absorbs the impact and allows for a rolling touchdown. The procedure is typically employed in emergencies to ensure a controlled stop, with the aircraft sliding along its belly rather than attempting an unsupported descent. Mechanically, the aircraft is configured for a stable, low-drag approach, often involving the extension of flaps to reduce stall speed while maintaining control. Pilots may also jettison excess fuel to lighten the aircraft, thereby lowering landing speed and minimizing post-impact fire risk from potential fuel leaks or sparks.[1] Upon touchdown, friction from the surface causes the aircraft to decelerate, with outcomes varying based on terrain—smoother surfaces like runways allow for longer slides with less structural damage compared to rough or soft ground.[3] Belly landings are primarily intentional emergency measures, such as in response to landing gear malfunction, but they can occur unintentionally due to oversight or failure. They primarily affect fixed-wing aircraft, though certain designs incorporate features to mitigate damage; for instance, the A-10 Thunderbolt II has partially exposed main gear wheels that remain visible even when retracted, reducing abrasion to the fuselage during such landings.[1][4]

Terminology and Distinctions

A belly landing, also referred to as a gear-up landing, occurs when an aircraft touches down without its landing gear extended, relying on the fuselage underside for contact with the surface.[5] The terms are often used interchangeably and apply to both intentional emergency procedures necessitated by mechanical failure and unintentional events resulting from pilot error, such as forgetting to deploy the gear.[2][6] Related terminology includes "dead-stick landing," which describes a forced descent without engine power, where the aircraft glides unpowered to the ground; this may or may not involve retracted gear, as the focus is on propulsion loss rather than undercarriage status.[2] In contrast, "ditching" refers to an emergency water landing by a land-based aircraft unable to reach solid ground, typically without gear extension but emphasizing the aquatic environment over fuselage contact.[6] These terms overlap in emergency contexts but differ in primary causes and execution: dead-stick prioritizes glide management, while ditching involves water-specific preparations like cabin securing.[2] The terminology originated during World War II, with the first recorded use of "belly-land" in 1942, reflecting the era's frequent instances of damaged fighters and bombers executing undersurface touchdowns to avoid total loss.[7] In modern aviation, the term is codified in regulatory and safety frameworks, such as those from aviation authorities emphasizing emergency gear-up scenarios due to malfunction.[2] Belly landings primarily apply to fixed-wing aircraft equipped with retractable landing gear, where the procedure involves skidding the fuselage on a prepared surface like a runway.[5] For rotary-wing aircraft like helicopters, which often use fixed skids or non-retractable wheels, the concept is less applicable; instead, emergencies typically involve autorotation descents to cushion impact vertically, avoiding the horizontal skid of a traditional belly landing.[8]

Causes

Pilot Error

Pilot error represents a primary human-induced cause of belly landings, particularly in incidents involving the failure to extend retractable landing gear before touchdown. Common errors include overlooking checklist procedures during pre-landing preparations, often due to distractions such as air traffic control communications, instrument fixation, or external environmental factors like wildlife on the runway. For instance, in general aviation operations, pilots have reported gear extension oversights stemming from cognitive overload during approach, where attention shifts away from gear status verification. Fatigue exacerbates these issues by impairing decision-making and attention to routine tasks, leading to incomplete execution of landing checklists.[5][9][10] A notable military example occurred on January 30, 2009, when a C-17 Globemaster III performed a belly landing at Bagram Airfield, Afghanistan, after the pilots failed to lower the landing gear, resulting in substantial damage to the aircraft's fuselage as it slid over 4,500 feet along the runway. The accident investigation determined that the pilots' oversight during the approach phase, compounded by high-workload conditions in a combat environment, directly contributed to the error, with no mechanical faults identified. Such incidents highlight how even experienced crews can neglect gear deployment amid operational pressures.[11][12] Psychological factors, including automation reliance in modern cockpits, foster "gear-up" complacency, where pilots develop overconfidence in automated systems and reduce vigilance for manual verifications like gear extension. Safety reports from the NASA Aviation Safety Reporting System document cases where seasoned pilots, accustomed to autopilot assistance, inadvertently omitted gear checks, mistaking routine familiarity for thorough preparation. According to analyses of general aviation incidents from 2003 to 2023 by the Australian Transport Safety Bureau, pilot error—encompassing these complacency-driven oversights and distractions—accounts for a substantial portion of the 321 reported wheels-up landings, underscoring the need for reinforced procedural discipline.[13][14][10]

Mechanical Failure

Mechanical failures leading to belly landings primarily involve malfunctions in the landing gear system that prevent proper extension or retraction, often stemming from hydraulic, electrical, or structural issues. Hydraulic problems, such as leaks or pump failures in the high-pressure hoses, can disrupt the fluid pressure required to deploy the gear, resulting in incomplete extension during approach.[15][16] Electrical faults in gear actuators, including wiring degradation or solenoid malfunctions, may similarly halt the powered extension sequence, forcing reliance on backup methods.[17] Structural damage, like stress corrosion cracking or fatigue in the main landing gear cylinder supports, can physically obstruct gear deployment, as seen in military aircraft incidents. For instance, in a 2014 A-10 Thunderbolt II event, the main landing gear failed to extend due to a mechanical malfunction, necessitating a controlled belly landing at Davis-Monthan Air Force Base.[18][19] Aircraft are equipped with emergency extension systems to mitigate such failures, including free-fall mechanisms that use gravity and air pressure to lower the gear, manual cranks for mechanical override, or alternate hydraulic sources. These backups, detailed in flight manuals, allow pilots to attempt deployment when normal systems fail, though dormant faults in these systems have prompted FAA airworthiness directives for inspections on certain models like Bombardier business jets.[20][21][22] Diagnostic processes for suspected gear failures begin with pre-landing checks, such as verifying gear position indicator lights during the "before landing" checklist to confirm extension and locking. If lights indicate a problem, pilots follow emergency procedures outlined in the aircraft's flight manual, including recycling the gear handle or activating alternate extensions while circling to troubleshoot.[1][23] Older aircraft are particularly susceptible to these failures due to accumulated wear, with corrosion in landing gear struts and fittings accelerating structural degradation over time. Studies on aging fleets highlight how prolonged exposure to environmental factors increases fatigue and corrosion risks, leading to higher incidence of gear-related incidents compared to newer airframes.[24][25][26]

Other Causes

Belly landings have occasionally resulted from combat or battle damage that renders the landing gear inoperable. During World War II, Allied aircraft frequently sustained hits to their undercarriage from enemy gunfire, flak, or shrapnel during missions over Europe, necessitating gear-up landings upon return to base. For instance, Boeing B-17 Flying Fortresses of the U.S. Army Air Forces often executed belly landings after flak damaged hydraulic systems or struts, allowing many crews to survive despite severe structural harm to the aircraft.[27] Similarly, fighter planes like the P-51 Mustang were forced into belly landings when battle damage compromised gear extension mechanisms. Fuel exhaustion can lead to a loss of electrical or hydraulic power, preventing the extension of retractable landing gear and forcing a belly landing. In such cases, the aircraft's engines fail due to depleted fuel reserves, cutting off the systems required for gear deployment. A notable example is Varig Flight 254 in 1989, where navigational error caused the Boeing 737 to exhaust its fuel over the Amazon jungle; the crew performed a belly landing in remote terrain, resulting in 13 fatalities but highlighting the critical role of power loss in gear failure.[28] Another incident involved a Colonial C-1 in 1996 near Halls Crossing, Utah, where fuel exhaustion during approach led to engine failure; the pilot executed a belly landing that resulted in the aircraft rolling inverted, but both occupants survived with substantial damage to the airframe.[29] Environmental factors, including bird strikes and severe weather, have also precipitated belly landings by directly or indirectly compromising the landing gear. Bird strikes can damage gear components if birds impact the undercarriage during low-altitude flight, though more commonly they affect engines and lead to power loss that hinders gear operation. The 2019 Ural Airlines Flight 178 incident exemplifies this: shortly after takeoff from Zhukovsky Airport, a bird strike into both engines caused thrust loss, forcing the Airbus A321 to belly land in a nearby cornfield with all 233 occupants surviving, though the aircraft was written off. A more recent case is Jeju Air Flight 2216 on December 29, 2024, when a Boeing 737-800 belly-landed at Muan International Airport, South Korea, after a suspected bird strike caused landing gear failure; the aircraft overshot the runway and collided with structures, resulting in 179 fatalities. Severe weather, such as icing or storms, can cause structural compromise to the gear through accumulation of ice on mechanisms or lightning-induced electrical failures. Icing, in particular, has led to gear malfunctions by freezing hydraulic lines, as seen in various general aviation forced landings where pilots opted for belly approaches to avoid collapse during touchdown. Rare cases of sabotage or mid-air collisions have similarly rendered landing gear unusable, compelling belly landings. Sabotage, though infrequent, might involve tampering with gear hydraulics or controls prior to flight, leading to in-flight failure. Mid-air collisions provide a more documented example: on September 29, 1940, two Avro Anson trainers from Australia's No. 2 Service Flying Training School collided near Brocklesby, New South Wales, locking together in mid-air. The pilot of the upper aircraft, Leading Aircraftman Leonard Graham Fuller, maintained control using the lower plane's engine and executed a successful belly landing in a paddock, allowing all four crew members to survive; three had parachuted earlier. This extraordinary event underscored the adaptability required in such external causal scenarios.

Procedures

Preparation

When a belly landing becomes inevitable due to landing gear failure, pilots initiate preparation by declaring an emergency with air traffic control (ATC) to secure priority handling, vectoring to a suitable airport, and coordination of ground emergency services.[1] This declaration must occur immediately upon confirming the gear malfunction through visual indicators, checklist verification, and any alternate extension attempts as outlined in the aircraft's flight manual (AFM) or pilot's operating handbook (POH).[5] Fuel management is a critical early step if time and altitude permit, with pilots opting to burn off excess fuel in a holding pattern or, for larger aircraft equipped with jettison systems, dump fuel to reduce landing weight, speed, and post-impact fire potential.[1] This reduces the risk of fuel-related hazards by minimizing the volume of flammable liquid on board during impact, though the procedure is only feasible when sufficient altitude allows safe dispersal away from populated areas.[5] In multi-crew operations, roles are assigned promptly: one pilot focuses on flying the aircraft and troubleshooting the gear, while others handle communications with ATC, passenger briefings, and cabin security.[5] Passengers are informed calmly of the situation and instructed to adopt brace positions, secure personal items, and remain seated with seatbelts fastened; crew members ensure all loose objects in the cabin are stowed or jettisoned to prevent injury from shifting debris.[30] Aircraft configuration continues with deactivating non-essential electrical systems to conserve battery power and mitigate spark risks, while maintaining essential avionics for navigation.[5] Pilots select and assess the landing site—preferring a long, straight runway or flat, open terrain—through a low-level flyover if off-airport landing is necessary, evaluating surface firmness, obstacles, and wind conditions to optimize safety.[1] Preparation typically spans from several minutes to over an hour, depending on remaining fuel endurance and altitude, allowing for methodical checklist execution without rushing the approach.[5]

Execution

During the execution of a belly landing, the pilot maintains a controlled approach to minimize impact forces and structural damage. The approach is typically conducted at a shallow descent angle to ensure a stable descent path, with full flaps extended to increase lift and reduce stall speed, allowing for a slower touchdown velocity around 1.2 to 1.5 times the aircraft's stall speed in landing configuration.[1][5] The aircraft must be aligned straight with the runway or selected landing surface to prevent yaw-induced veering, using rudder and aileron inputs to keep wings level and maintain directional control.[30] At touchdown, the pilot adopts a nose-high attitude to protect critical components such as the propeller, engines, and cockpit while allowing the tail or rear fuselage to contact the surface first, distributing the impact energy across the belly.[1][5] Power is reduced to idle during the flare to control deceleration through aerodynamic drag, with the engine often shut down immediately prior to contact to eliminate risks from spinning components.[10] Following initial contact, the aircraft slides along its underside, and the pilot applies brakes sparingly—if wheels are partially extended—to avoid uneven deceleration that could cause flipping or further damage, relying primarily on surface friction for stopping.[30] In cases of potential fire from fuel leaks or sparks, rapid evacuation is essential, with occupants exiting via the nearest clear door or hatch after securing the aircraft.[5] Procedures vary by aircraft type to account for design differences. For propeller-driven aircraft, the nose-high attitude is critical to prevent propeller strikes, and engine shutdown is prioritized; tail-dragger configurations naturally facilitate tail-first contact, reducing forward fuselage exposure.[1] In jets, reverse thrust can supplement deceleration if available, with less emphasis on propeller protection but similar focus on fuselage-first sliding to protect engines mounted on the wings or rear.[30]

Risks and Outcomes

Hazards

Belly landings pose significant physical risks to the aircraft structure, primarily due to the absence of landing gear to absorb impact forces. Upon touchdown, the fuselage may scrape against the surface, leading to potential structural breakup if the aircraft encounters obstacles or if the initial contact is uneven. Propeller strikes are a common hazard in propeller-driven aircraft, where a nose-down pitch during deceleration can cause the blades to dig into the ground, resulting in severe imbalance, vibration, and further structural compromise. These risks are exacerbated on hard surfaces like runways, where friction generates high drag and heat, potentially causing the aircraft to veer uncontrollably.[5][10] Fire and explosion represent one of the most immediate and lethal dangers during and immediately after a belly landing. Friction between the metal fuselage and the landing surface can produce sparks, which may ignite fuel leaks from ruptured tanks or lines, especially if hot engine components are exposed. According to the Federal Aviation Administration, such sparks on hard runways are a primary fire initiation mechanism in gear-up landings, with the potential for rapid fire spread leading to explosions if unmitigated. Post-impact fires have been identified as a significant cause of fatalities in survivable aviation accidents, particularly through smoke inhalation and thermal injuries, underscoring the need for swift evacuation.[1][5][31] Injuries to occupants during belly landings often stem from the sudden deceleration and sliding motion, with common patterns including whiplash from rapid forward-backward head movement and blunt trauma from impact with interior surfaces. Debris penetration, such as shattered cockpit glass or dislodged components, can cause lacerations or punctures, particularly in high-speed slides where kinetic energy is higher. The FAA notes that unrestrained passengers are especially vulnerable to secondary collisions, amplifying injury severity, while restrained occupants may still experience bruising or spinal strain from the jolting forces. These injury risks are heightened without the cushioning effect of landing gear, making occupant positioning critical.[1][5] Environmental factors further compound the hazards of belly landings, with uneven terrain posing a high risk of cartwheeling or tumbling. Rough or sloped surfaces can cause the aircraft to catch on protrusions, leading to uncontrolled rolling motions that disintegrate the structure and endanger occupants. The Civil Aviation Safety Authority highlights that wet or soft grass, while reducing friction-related sparks, increases the likelihood of veering on uneven ground, potentially resulting in flips or collisions with obstacles. Selection of flat, obstacle-free terrain is essential to minimize these dynamics.[10][1]

Survival and Damage Assessment

Belly landings in modern commercial aviation exhibit high survivability rates, consistent with an overall 95.7% occupant survival in U.S. air carrier accidents under Part 121 operations from 1983 to 2000.[32] Recent analyses, such as in Australian general aviation up to 2024, report no serious or fatal injuries in 321 gear-up events.[10] In general aviation, gear-up landings—often synonymous with belly landings—are even more survivable, rarely resulting in serious injuries when executed on prepared runways, as they seldom meet the criteria for reporting as accidents due to minimal occupant harm.[33] Survival rates tend to be lower in older propeller aircraft, where less robust fuselage designs and higher propeller strike risks contribute to increased injury potential during uncontrolled slides.[34] Damage from belly landings primarily manifests as fuselage abrasion from runway friction, exposure and potential contamination of landing gear wells, and structural deformation in the underbelly skin, though these impacts are often confined to replaceable components like panels and doors.[35] In many cases, the aircraft remains repairable rather than a total loss; for instance, single-engine piston planes typically incur repair costs around $40,000 for minor to moderate belly damage, allowing return to service after skin replacement and inspections, in contrast to severe cases classified as substantial damage requiring extensive airframe evaluation.[36] Multi-engine aircraft may face higher costs due to propeller and nacelle involvement but still often avoid write-off if the core structure remains intact.[37] Outcomes improve significantly with design features in military aircraft, such as the A-10 Thunderbolt II's rugged landing gear and reinforced underbelly that minimize structural compromise during gear-up scenarios, enabling rapid post-landing recovery.[38] Additionally, crew training in rapid evacuation drills enhances survivability by facilitating quick egress before potential fire or further sliding damage escalates risks.[31] Post-incident assessments by regulatory bodies like the NTSB involve detailed examinations of airframe stress, including non-destructive testing of the fuselage for cracks and deformation, to determine airworthiness for repairs.[35] Insurance evaluations similarly focus on categorizing damage—such as repairable Category C versus economic total loss—factoring in salvage value and labor costs to approve hull claims, often resulting in targeted fixes like belly skin resurfacing rather than full replacement.[37]

Prevention

Technological Systems

Technological systems designed to prevent or mitigate belly landings primarily focus on early detection of landing gear issues and built-in redundancies to ensure reliable operation. Warning systems are a cornerstone of these efforts, providing pilots with immediate visual and aural cues to address unsafe configurations. In most fixed-wing aircraft with retractable gear, visual indicators such as green lights signal that the gear is down and locked, while amber or red "gear unsafe" lights illuminate if the gear is up, in transit, or not fully extended. These lights are activated by position sensors, including squat switches on the main landing gear struts that detect compression under weight. Aural warnings complement these visuals; for instance, a continuous or repeating horn activates in landing configuration—typically when airspeed is low (below about 1/3 of stall speed or a set threshold), flaps are extended, and throttles are retarded—but the gear remains retracted. In commercial airliners, these aural alerts often use synthesized voice announcements, such as "landing gear" or "gear unsafe," to convey the issue clearly amid high-workload phases. Regulatory standards mandate these systems: under 14 CFR § 25.729, transport-category airplanes must provide an aural warning if a landing is attempted without the gear down and locked, with the system designed to minimize false activations through integration with airspeed, flap, and throttle sensors. Similarly, takeoff configuration warning systems, required by 14 CFR § 25.703, deliver aural alerts (e.g., a horn or voice cue) if the aircraft attempts takeoff with flaps or gear in an unsafe state, preventing inadvertent departures that could lead to later gear-up landings.[39][40] Redundancy features enhance gear reliability, particularly against mechanical failures that could force a belly landing. Modern aircraft typically employ multiple independent hydraulic systems—often three in large jets like the Boeing 777 or Airbus A320 family—to power gear extension and retraction, with each system capable of handling the full load if others fail. Backup hydraulic pumps, powered by engines, auxiliary power units, or electric motors, provide additional failover capability. For emergency scenarios, alternate extension methods allow gravity-assisted free-fall deployment: pilots can release hydraulic pressure and uplocks, enabling the gear to drop under gravity and lock via downlocks, bypassing primary systems. This "blowdown" or free-fall process is standard in transport aircraft and is initiated via cockpit controls that vent hydraulic fluid. Additionally, some designs incorporate automatic retraction logic during takeoff; once weight is off the wheels (detected by squat switches) and thrust exceeds a threshold, the gear retracts if the handle is up, reducing pilot workload but with safeguards against erroneous inputs. These redundancies ensure that gear failures, which account for a subset of mechanical issues leading to belly landings, are survivable without compromising extension.[41][42] Advancements in post-2010 aircraft, particularly those with fly-by-wire (FBW) architectures like the Airbus A350 and Boeing 787, integrate sophisticated sensors for proactive anomaly detection in landing gear systems. FBW flight control computers monitor gear position, hydraulic pressure, and strut compression in real-time via embedded sensors, such as linear variable differential transformers (LVDTs) and proximity detectors, cross-checking data against expected parameters during flight phases. If discrepancies arise—such as asymmetric extension or pressure drops—the system generates prioritized alerts through the electronic centralized aircraft monitor (ECAM) or engine indicating and crew alerting system (EICAS), often before pilots notice. These digital twins of gear health, supported by built-in test equipment (BITE), enable predictive maintenance by logging anomalies for ground analysis, reducing in-flight surprises. Such integrations have contributed to overall safety gains, with studies showing a 40% reduction in air carrier mishaps attributed to pilot error (including gear-related oversights) from the 1980s to the early 2000s, a trend bolstered by ongoing technological refinements.[43][44]

Training and Protocols

Pilot training programs incorporate mandatory simulator scenarios simulating landing gear failures to prepare crews for emergency belly landings. Under the U.S. Federal Aviation Administration's (FAA) regulations in 14 CFR Part 121, Appendix E outlines flight training requirements that explicitly include maneuvers and procedures for landing gear and flap systems failure or malfunction, ensuring pilots practice these scenarios during recurrent training and certification.[45] This simulator-based approach allows for safe replication of high-risk situations, emphasizing decision-making, aircraft control, and post-landing procedures without real-world hazards.[46] Standardized checklists form a core procedural measure to prevent inadvertent gear-up landings. Before-landing flows, such as the widely adopted GUMPS mnemonic—encompassing Gas, Undercarriage, Mixture, Propeller, and Seatbelts—require explicit verification of the landing gear position, typically through visual inspection of indicators and three-green-light confirmation on the panel.[47] These checklists are integrated into airline operations manuals and FAA guidelines, promoting a systematic "challenge-response" or "do-verify" process to minimize oversight during the high-workload approach phase.[48] Crew Resource Management (CRM) training reinforces collective vigilance through cross-checks, where pilots mutually confirm critical actions like gear extension to detect errors early. FAA resources highlight CRM's role in enhancing communication and workload sharing during landing, reducing the likelihood of single-point failures in gear deployment.[49] This human-factors approach, mandated in pilot certification, fosters a culture of assertive monitoring and challenge, as outlined in international standards from the International Civil Aviation Organization (ICAO).[50] Regulatory frameworks evolve through post-incident reviews to strengthen protocols. Following the 2020 crash of Pakistan International Airlines Flight 8303, attributed to human error resulting in an erroneous belly landing despite the gear being extended,[51] Pakistan's Civil Aviation Authority implemented enhanced training mandates across operators, focusing on CRM and checklist adherence as part of Asia-Pacific safety reforms audited by the European Union Aviation Safety Agency (EASA).[52] Such updates often integrate technological aids, like gear warning simulators, into recurrent sessions to align human protocols with advancing systems.

Unmanned Belly Landings

Historical Examples

One of the earliest documented cases of an unmanned belly landing occurred during World War II, when a Boeing B-17G Flying Fortress, known as the "Phantom Fortress," approached a Royal Air Force base near Cortenberg, Belgium, on November 23, 1944. Severely damaged by flak during a bombing mission over Merseburg, Germany, the crew of the 91st Bombardment Group had bailed out earlier using personal parachutes, leaving the aircraft on autopilot with emergency parachutes still aboard. The bomber, flying at low altitude with its landing gear extended, executed an emergency belly landing in a field at high speed, snapping off its propellers and damaging its wings while three engines continued running post-impact; no battle damage was evident beyond the crash itself, and all nine crew members were later found safe in Belgium after evading capture.[53] In the pre-GPS era, such incidents relied on rudimentary autopilot systems for stability, which maintained basic trim and heading without advanced navigation, often resulting in unpredictable but sometimes fortuitous outcomes like controlled glides to the ground. These early autopilots, typically gyroscopic devices introduced in the 1930s, provided limited attitude control but proved sufficient in cases where aircraft configuration changes—such as reduced weight from crew ejection—allowed natural recovery from instability.[54] A notable Cold War example demonstrating this reliance on autopilot occurred on February 2, 1970, involving a Convair F-106A Delta Dart interceptor, serial number 58-0787, during a training flight from Malmstrom Air Force Base, Montana. Assigned to the 71st Fighter-Interceptor Squadron, the aircraft entered an uncontrollable flat spin at approximately 15,000 feet due to an aerodynamic anomaly, prompting pilot 1st Lt. Gary Foust to eject safely. Unmanned, the F-106 recovered level flight on its own—likely due to the center-of-gravity shift from the ejection seat departure and its pre-trimmed landing configuration—before gliding to a gentle belly landing in a snow-covered field near Big Sandy, Montana, where it skidded to a stop with its engine running for nearly two hours afterward. The aircraft sustained only minor damage, was repaired, and returned to service for over a decade, eventually retiring to the National Museum of the United States Air Force.[55]

Modern Applications

In the development of unmanned aerial vehicles (UAVs), intentional belly landings serve as a critical testing method to evaluate structural durability and recovery protocols, particularly for operations in austere environments lacking runways. Researchers at Chalmers University of Technology modeled the dynamics of belly landings for the LocalHawk UAV, simulating impacts to optimize fuselage design and reduce damage during ground contact, thereby enhancing reusability in field testing scenarios.[56] Similarly, studies on composite materials for mini-UAV fuselages have analyzed stress distribution during belly impacts, informing designs that prioritize lightweight yet resilient structures for repeated testing cycles.[57] Remote-controlled recoveries in military operations increasingly incorporate belly landings as a viable option following in-flight damage or gear malfunctions, enabling asset preservation without specialized infrastructure. For instance, in September 2018, a U.S. Navy MQ-4C Triton UAV executed an emergency belly landing at Naval Base Ventura County after its landing gear failed to deploy during a training flight, allowing safe recovery of the high-value surveillance platform with minimal structural compromise.[58] This approach aligns with broader tactical UAV designs, such as modular systems employed by various militaries, which integrate belly landings alongside parachutes for rapid field retrieval in combat zones.[59] Autonomous systems in experimental programs leverage AI to execute guided maneuvers, adapting to real-time failures for optimized outcomes. With testing beginning in 2025, DARPA's EVADE initiative equips small UAS with AI-driven autonomy for full-mission navigation in contested environments.[60] Integrated autopilots from providers like UAV Navigation further support emergency procedures to limit damage, as validated in post-2020 field trials for beyond-visual-line-of-sight operations.[61] Despite these advancements, modern belly landing applications in unmanned systems remain emerging and under-documented as of November 2025, particularly for large-scale cargo platforms. While 2025 tests of China's CH-YH1000 unmanned cargo drone emphasized conventional flight profiles with belly-access hatches for loading, explicit belly landing validations in autonomous cargo contexts are sparse, highlighting a gap in public reporting for high-payload recoveries.[62]

Notable Examples

Military and Early Incidents

One of the earliest notable incidents involving a belly landing occurred on September 29, 1940, when two Avro Anson training aircraft from the Royal Australian Air Force's No. 2 Service Flying Training School collided mid-air over Brocklesby, New South Wales, Australia. The aircraft locked together, with one perched atop the other, but pilot Leading Aircraftman Leonard G. Fuller managed to control the combined structure using the lower aircraft's ailerons and flaps, executing a successful belly landing in a nearby paddock. Both pilots survived without injury, and the entangled planes slid approximately 180 meters before stopping; the incident is preserved as a unique example of aviation ingenuity during World War II training operations.[63] In military aviation during World War II, belly landings were frequently employed by pilots of damaged fighters to return to base. The P-51 Mustang, a key U.S. Army Air Forces fighter, often required such maneuvers when battle damage from flak or enemy fighters compromised the landing gear or hydraulics, allowing pilots to salvage aircraft and provide post-mission intelligence. U.S. Air Force serial number records document numerous P-51D variants involved in wheels-up belly landings at bases like RAF Bury St Edmunds in 1945, with pilots surviving despite substantial airframe damage.[64] Early civilian incidents highlighted the risks and successes of belly landings in commercial aviation. On July 19, 1951, Eastern Air Lines Flight 601, a Lockheed L-749A Constellation (N119A) en route from Newark to Atlanta, experienced a gear extension failure caused by an in-flight access door opening, leading to hydraulic issues. The captain elected to divert and perform a belly landing on Curles Neck Farm near Richmond, Virginia, where the aircraft slid through a cornfield; all 39 passengers and crew survived with no serious injuries, though the plane was substantially damaged.[65] Similarly, on June 13, 1991, Korean Air Flight 376, a Boeing 727-281 (HL7350) on a domestic flight from Jeju to Daegu, South Korea, conducted an inadvertent gear-up landing at Daegu International Airport due to the crew omitting the landing checklist and pulling the gear circuit breaker. The aircraft skidded along the runway, resulting in minor injuries to several of the 109 people on board but no fatalities, with the plane later repaired.[66]

Civilian and Recent Incidents

One notable civilian belly landing occurred on July 4, 2000, involving Malév Hungarian Airlines Flight 262, a Tupolev Tu-154B-2 operating from Budapest to Thessaloniki, Greece. During the approach to Thessaloniki Airport, the flight crew attempted a go-around after a high sink rate, but the landing gear failed to extend on the subsequent landing attempt, resulting in a gear-up touchdown that caused the aircraft to skid along the runway. The incident led to two fatalities among the 109 passengers and crew due to injuries sustained during the evacuation, with the aircraft suffering substantial damage from the belly contact and fire.[67] In 2011, LOT Polish Airlines Flight 16, a Boeing 767-300ER en route from Newark to Warsaw, experienced a hydraulic system failure shortly after takeoff, preventing the landing gear from extending during the emergency return to Warsaw Chopin Airport on November 1. The captain executed a controlled belly landing on the runway, allowing all 231 people on board to evacuate safely without serious injuries, though the aircraft was damaged beyond repair. This event highlighted effective crew training in managing hydraulic failures leading to gear-up scenarios.[68][69] The crash of Pakistan International Airlines Flight 8303 on May 22, 2020, marked a tragic civilian belly landing involving an Airbus A320 from Lahore to Karachi, Pakistan. After both engines lost power due to pilot error in ignoring warnings during a go-around attempt amid low fuel and gear issues, the aircraft struck a residential area short of the runway, resulting in a belly-down impact followed by a post-crash fire that killed 97 of the 99 people on board and two on the ground. The official investigation attributed the outcome to the crew's disregard of engine flameout indications and sterile cockpit violations.[70] On October 4, 2023, FedEx Flight 1376, a Boeing 757-200SF cargo flight from Memphis to Chattanooga, Tennessee, suffered a left hydraulic system failure due to a ruptured hose and electrical issues, rendering the landing gear inoperable during the diversion back to Chattanooga Metropolitan Airport. The crew performed a successful belly landing with no injuries to the two pilots, though the aircraft overran the runway and sustained significant fuselage damage; the NTSB report emphasized the role of aging hydraulic components in the failure.[71][72] The deadliest recent civilian incident was Jeju Air Flight 2216 on December 29, 2024, a Boeing 737-800 from Bangkok to Muan International Airport, South Korea. A bird strike damaged both engines, leading to a loss of thrust and a runway excursion during the belly landing attempt; the aircraft collided with a wall, burst into flames, and resulted in 179 fatalities among the 181 on board, with only two flight attendants surviving. Preliminary investigations revealed duck DNA in the engines and potential pilot error in shutting down the wrong engine, exacerbating the power loss.[73][74] In 2025, several smaller civilian belly landings underscored the prevalence of such events in general aviation. On April 11, a Mooney M20 with two occupants made a gear-up landing at Tucson International Airport due to an unspecified gear malfunction, with both aboard escaping unharmed. On June 11, a Transair Shorts SD3-60 cargo flight experienced a gear-up landing at Daniel K. Inouye International Airport due to crew distraction in failing to extend the landing gear, resulting in a belly landing but no injuries to the five crew members. Finally, on August 29, a Piper PA-23-250 Aztec at Port St. Lucie-Treasure Coast Airpark in Florida suffered nose gear failure, leading to a controlled belly landing by the sole pilot, who walked away uninjured. These incidents, often involving older general aviation aircraft, highlight ongoing challenges in small-plane operations that extend beyond the coverage of many public records up to 2024.[75][76][77]

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