JT9D-59B

Engine model
Retired
Manufacturer Pratt & Whitney
Engine type Turbofan

Technical specifications

Design
Fan stages
1
HP compressor stages
11
HP turbine stages
2
LP compressor stages
4
LP turbine stages
4
Dimensions
Fan diameter
2.43 m
7.97 ft
Performance
Bypass ratio
4.8:1
Pressure ratio
25.2:1