Lockheed C-141 Starlifter

The Lockheed C-141 Starlifter is a retired military strategic airlifter that served with the Military Air Transport Service (MATS), its successor organization the Military Airlift Command (MAC), and finally the Air Mobility Command (AMC) of the United States Air Force (USAF). The aircraft also served with airlift and air mobility wings of the Air Force Reserve (AFRES), later renamed Air Force Reserve Command (AFRC), the Air National Guard (ANG) and, later, one air mobility wing of the Air Education and Training Command (AETC) dedicated to C-141, C-5, C-17 and KC-135 training.

Introduced to replace slower propeller driven cargo planes such as the Douglas C-124 Globemaster II and Douglas C-133 Cargomaster, the C-141 was designed to requirements set in 1960 and first flew in 1963. Production deliveries of an eventual 285 planes began in 1965: 284 for the USAF, and a company demonstrator later delivered to National Aeronautics and Space Administration (NASA) for use as an airborne observatory. The aircraft remained in service for over 40 years until the USAF withdrew the last C-141s from service in 2006, after replacing the airlifter with the C-17 Globemaster III.

Throughout the early 1960s, the United States Air Force's Military Air Transport Service (MATS) relied on a substantial number of propeller-driven aircraft for strategic airlift. As these aircraft were mostly obsolescent designs and the USAF needed the benefits of jet power, the USAF ordered 48 Boeing C-135 Stratolifters as an interim step. The C-135 was a useful stop-gap, but only had side-loading doors, thus much of the bulky and oversize equipment employed by the U.S. Army would not fit.

In spring 1960, the USAF released Specific Operational Requirement (SOR) 182, calling for a new aircraft that would be capable of performing both strategic and tactical airlift missions. The strategic role demanded that the aircraft be capable of missions with a radius of at least 3,500 nautical miles (6,500 km) with a 60,000 pounds (27,000 kg) load. The tactical role required it to be able to perform low-altitude air drops of supplies, as well as carry and drop combat paratroops. The final version of SOR 182 was released in fall 1960, and requests for proposals were sent to Boeing, Douglas, Convair, and Lockheed-Georgia.

Lockheed's design team produced their own unique design in response to the requirement, internally designated as the Lockheed Model 300; it would be the first large jet designed from the start to carry freight. In comparison to the firm's previous utility transport, the turboprop-powered Lockheed C-130 Hercules, it was considerably bigger, as well as possessing greater speed and more power. In terms of its basic configuration, the Model 300 was a large airlifter, furnished with a T-tail and a high-mounted swept wing, under which a total of four pod-mounted TF33 turbofan engines were fitted. The Model 300 possessed a lengthy, unobstructed cargo deck, which provided sufficient space and fittings to safely accommodate up to 154 troops or 42,869 kg (94,510 lb) of cargo.

During March 1961, Lockheed's submission was selected as the winner. President John F. Kennedy's first official act after his inauguration was to order the development of the Lockheed 300 on 13 March 1961, placing an initial contract for five aircraft for test and evaluation, to be designated the C-141. One unusual aspect of the aircraft was that it was designed to meet both military and civil airworthiness standards. The prototype C-141A serial number 61-2775 was manufactured and assembled in record time, having been rolled out of Lockheed's factory at Marietta, Georgia on 22 August 1963. It was also the first aircraft to be designed and produced at the plant that would go into full-rate production. The prototype performed its maiden flight on 17 December of that year, coinciding with the 60th anniversary of the Wright brothers' first flight.

In conjunction with the USAF, Lockheed subjected the prototype to an intensive flight testing program, which would involve five testing and evaluation aircraft. The first delivery of a production C-141 occurred during April 1965. Over the course of three years, a total of 284 C-141s were manufactured, excluding five aircraft constructed for testing purposes. Production of new-build C-141s ended in February 1968.

During the 1960s, Lockheed had made efforts to market the aircraft on the civilian market; this resulted in provisional orders having been placed by both Flying Tiger Line and Slick Airways for four aircraft each. These were to be a stretched version, 37 feet (11 m) longer than the C-141A, which was marketed as the L-300 SuperstarLifter. Other changes were also incorporated to adapt the design to be more suited to the commercial sector, including the use of a different control yoke. The development was not sustained and only the one civilian demonstration aircraft was built. When no commercial sales were made, Lockheed donated the aircraft to NASA.