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Pratt & Whitney JT9D-1GT2 Turbofan Engine, Cutaway


Display Status:

This object is on display in the Jet Aviation exhibition at the National Air and Space Museum in Washington, DC.

Collection Item Summary:

The Pratt & Whitney JT9D turbofan was developed to power the first generation of wide-body commercial jets. It first ran in 1966, was flight tested in 1968, and received FAA certification in 1969.

JT9D engines powered the Boeing 747 on its first flight on February 9, 1969, and entered airline service in 1970. The JT9D also powered some versions of the McDonnell Douglas DC-10, and Airbus Industrie A300 and A310.

An advanced design, the JT9D was the first of the very large, high bypass ratio turbofans in commercial service. The JT9D displayed here is a pre-production engine built for ground testing rather than for flight, although it is outwardly identical to production examples.

Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


Credit Line

Gift of Pratt & Whitney Aircraft, Division of United Technologies Corporation


Metal, plastic


Length 305.1 cm (128.0 in.,) Diameter 241.3 cm (95.0 in.)

Country of Origin

United States of America



Physical Description

  • Type: Turbofan, 2-shaft
  • Thrust: 235,700 N (53,000 lb)
  • Compressor: Single-stage fan, 3-stage low pressure, 11-stage high pressure
  • Combustor: Annular
  • Turbine: 2-stage high pressure , 4-stage low pressure
  • Weight: 4,153 kg (9,155 lb)


PROPULSION-Turbines (Jet)

Inventory Number


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