Pratt & Whitney Canada PT6T
The Pratt & Whitney Canada PT6T Twin-Pac is a turboshaft engine designed for helicopters. Manufactured by Pratt & Whitney Canada, its first application was in the Bell 212 and UH-1N Twin Huey helicopter family. The PT6T Twin-Pac consists of two PT6A power turbines driving a common output reduction gearbox, producing up to 2,000 hp at 6,000 rpm. The engine is designated T400 by the U.S. military.
Development
The U.S. military came very close to not procuring the UH-1N Twin Huey because of the PT6T. The purchase of the aircraft for U.S. military use was opposed by the Chairman of the House Armed Services Committee at the time, Mendel Rivers. Rivers took this position because the PT6T was produced in Canada. The Canadian government had not supported U.S. involvement in Vietnam, and had opposed U.S. policies in southeast Asia, as well as accepting U.S. draft dodgers. Rivers was also concerned that procurement of the engines would result in a negative trade deficit situation with Canada. Congress only approved the purchase when it was assured that a U.S. source would be found for the PT6T engines. This source was Pratt & Whitney Engine Services in Bridgeport, West Virginia, which was established in 1971 to assemble and test new T400-WV-402 engines. As a result, the U.S. military ordered 294 Bell 212s under the designation UH-1N, with deliveries commencing in 1970.Variants
;PT6T-3;PT6T-3A
;PT6T-3B
;PT6T-3BE
;PT6T-3BF
;PT6T-3BG
;PT6T-3D
;PT6T-3DE
;PT6T-3DF
;PT6T-6
;PT6T-6B
;PT6T-9
;T400-C-400
;T400-CP-401
;T400-WV-402
Applications
- Bell 212
- Bell 309
- Bell 412
- Bell AH-1J and AH-1T SeaCobra
- Bell CH-146 Griffon
- Bell UH-1N Twin Huey
- Sikorsky S-58T
- Sikorsky S-69
| VARIANT | APPLICATION |
| PT6T-3 | Leonardo Helicopters AB212 |
| PT6T-3 | Sikorksy S-58T |
| PT6T-3B | Bell Model 212 |
| PT6T-3B | Bell Model 412/SP/HP/EP |
| PT6T-3B | Leonardo Helicopters AB412 |
| PT6T-3BE | Bell Model 412/SP/HP/EP |
| PT6T-3BE | Leonardo Helicopters AB412 |
| PT6T-3BF | Bell Model 412/SP/HP/EP |
| PT6T-3BG | Bell Model 412/SP/HP/EP |
| PT6T-3D | Bell Model 412/SP/HP/EP |
| PT6T-3D | Bell CFUTTH CH-146 Griffon |
| PT6T-3D | Leonardo Helicopters AB412 |
| PT6T-3DF | Bell Model 412/SP/HP/EP |
| PT6T-3DF | Leonardo Helicopters AB412 |
| PT6T-3G | Leonardo Helicopters AB412 |
| PT6T-6 | Leonardo Helicopters AB212 |
| PT6T-6 | Leonardo Helicopters AB412 |
| PT6T-6 | Sikorsky S-58T |
| PT6T-9 | Bell Model 412 EPI |