12 Facts About Douglas DC-9

McDonnell Douglas DC-9 is an American five-abreast single-aisle aircraft designed by the Douglas Aircraft Company.

In 1960, Douglas DC-9 signed a two-year contract with Sud Aviation for technical cooperation.

None were ordered and Douglas DC-9 returned to its design studies after the cooperation deal expired.

Unlike the competing but larger Boeing 727 trijet, which used as many 707 components as possible, the Douglas DC-9 was an all-new design.

Douglas DC-9 series, the first generation of the Douglas DC-9 family, was a commercial success for the manufacturer.

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Douglas DC-9 family is one of the longest-lasting aircraft in production and operation.

Between 1973 and 1975 McDonnell Douglas studied the possibility of re-engining the DC-9 with the JT8D-109 turbofan, a quieter and more efficient variant of the JT8D.

Original Douglas DC-9 series was followed in 1980 by the introduction of the second generation of the Douglas DC-9 family, the MD-80 series.

All versions of the Douglas DC-9 are equipped with an AlliedSignal GTCP85 APU, located in the aft fuselage.

All versions of the Douglas DC-9 are equipped with a tricycle undercarriage, featuring a twin nose unit and twin main units.

In 1969, a DC-9 Series 20 at Long Beach was fitted with an Elliott Flight Automation Head-up display by McDonnell Douglas and used for successful three-month-long trials with pilots from various airlines, the Federal Aviation Administration, and the US Air Force.

Some visual cues to distinguish this version from other Douglas DC-9 variants include side strakes or fins below the side cockpit windows, spray deflectors on the nose gear, and thrust reversers angled inward 17 degrees as compared to the original configuration.