Most JT3D engines still in service today are used on military aircraft, where the engine is referred to by its US military designation of TF33.

The TF33 is the United States Air Force designation for the Pratt & Whitney JT3 commercial engine which boasts decades of proven performance in both military and civilian service.

The Pratt & Whitney TF33 turbofan engine was developed from the highly successful Pratt & Whitney J57 engine core. Starting in 1960, the civilian version (designated the JT3D) powered …

Initially introduced in the late 1950s, the JT3D variant has powered iconic aircraft such as the Boeing 707 and the Douglas DC-8, while the military designation TF33 has been a stalwart in …

Jun 24, 2025 · The most significant difference between the B-52H and the earlier Stratofortresses is the replacement of the eight Pratt & Whitney J57-series turbojet engines with eight Pratt & …

Nov 16, 2023 · Pratt & Whitney has secured a $870 million contract to support TF33 engines powering the B-52 Stratofortress and E-3 Sentry aircraft.

Nov 16, 2023 · Pratt & Whitney, an RTX subsidiary, has agreed to sustain the US Air Force’s (USAF) TF33 engines, which power the service’s B-52 Stratofortress and E-3 Sentry aircraft.

Therefore, the TF33 is still very much in use and the need to understand its ability to operate and predict its potential for failure is at an all-time high. Another important factor is that the depot …

Jun 6, 2015 · The Air Force began using the TF33 to power B-52 Stratofortresses in March 1961 and it still uses them today. The engine also has been keeping E-3 Sentry Airborne Warning …

Designed in the 1950s and manufactured in the 1960s and 1970s, the TF33 is one of the oldest engine families in the Air Force inventory.