McDonnell Douglas DC-10

The McDonnell Douglas DC-10 is a three-engine widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of thevertical stabilizer. The DC-10 has range for medium to long haul flights. The model was a successor to the company's DC-8 for long-range operations, and competed in the same markets as theLockheed L-1011 Tristar, which has a similar layout to the DC-10.

Production of the DC-10 ended in 1989 with 386 delivered to airlines and 60 to the U.S. Air Force as air-to-air refueling tankers, designated the KC-10 Extender. The DC-10 was succeeded by the relatedMcDonnell Douglas MD-11 which entered service in 1990.

Following an unsuccessful proposal for the US Air Force's CX-HLS (Heavy Logistics System) in 1965, Douglas Aircraft began design studies based on its CX-HLS design. In 1966, American Airlines offered a specification to manufacturers for a widebody aircraft smaller than the Boeing 747 but capable of flying similar long-range routes from airports with shorter runways. The DC-10 became McDonnell Douglas's first commercial airliner after the merger between McDonnell Aircraft Corporation and Douglas Aircraft Company in 1967.

The DC-10 was first ordered by launch customers American Airlines with 25 orders, and United Airlines with 30 orders and 30 options in 1968. The DC-10, a series 10 model, made its first flight on August 29, 1970. Following a flight test program with 929 flights covering 1,551 hours, the DC-10 was awarded a type certificate from the FAA on July 29, 1971. It entered commercial service with American Airlines on August 5, 1971 on a round trip flight between Los Angeles and Chicago. United Airlines began DC-10 service on August 16, 1971. The DC-10's similarity to the L-1011 in terms of passenger capacity and launch in the same timeframe resulted in a head to head sales competition which affected profitability of the aircraft.

The first DC-10 version was the "domestic" series 10 with a range of 3,800 miles (3,300 nmi, 6,110 km) with a typical passenger load and a range of 2,710 miles (2,350 nmi, 4,360 km) with maximum payload. The series 15 had a typical load range of 4,350 miles (3,780 nmi, 7,000 km). The series 20 was powered by Pratt & Whitney JT9D engines, whereas the series 10 and 30 engines were General Electric CF6. Before delivery of its aircraft, Northwest's president asked that the "series 20" aircraft be redesignated "series 40" because the aircraft was much improved over the original design. The FAA issued the Series 40 certificate on October 27, 1972.

The series 30 and 40 were the longer range "international" versions. One of the main visible differences between the models is that the series 10 has three sets of landing gear (one front and two main) while the series 30 and 40 have four gear (one front, three main). The center main two-wheel landing gear (which extends from the center of the fuselage) was added to accommodate the extra weight by distributing the weight and providing additional braking. The series 30 had a typical load range of 6,220 mi (10,010 km) and a maximum payload range of 4,604 mi (7,410 km). The series 40 had a typical load range of 5,750 miles (9,265 km) and a maximum payload range of 4,030 miles (3,500 nmi, 6,490 km).

Eventually, the DC-10 was able to distinguish itself from its competitors with two engine options, as well as earlier introduction of longer range variants than the L-1011. The 446th and final DC-10 rolled off the production line in December 1988 and was delivered to Nigeria Airwaysin July 1989. The DC-10 was assembled at McDonnell Douglas's Douglas Products Division in Long Beach, California. As the final few DC-10 deliveries were occurring, McDonnell Douglas had already started production of the DC-10's successor, the MD-11.

The DC-10 is a low-wing cantilever monoplane with a conventional tail unit with a single fin and rudder. It is powered by two turbofan engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. It has a retractable tricycle landing gear. The later series 30 and 40 have an additional two-wheel main landing gear on the centerline of the fuselage. It was designed to be a medium to long-range airliner with a widebody fuselage to seat over 250 passengers. It is operated by a flight-crew of three located on the flightdeck in the nose on the same level as the passenger cabin. The fuselage has underfloor stowage for cargo and baggage.