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HOWEVER - the TF41 was not available until the late 1960s... it was created when the USAF decided it liked the A-7 and on 5 Nov. 1965 ordered its own version (A-7D) with an Allison-built modified version of the Spey.Development of the TF41 started in June 1966, and this became the TF41-A-1, which was more powerful than any RR-built Spey (14,500 lbst vs 12,250 lbst).The TF41 was first run at RR-Derby on 18 Oct. 1967, and production deliveries started in 1968 (the first A-7D with a TF41 first flew on 26 Sept. 1968 - the two prototypes had TF30 engines and flew in April 1968).The 15,000 lbst TF41-A-2 for the USN's A-7Es followed shortly after.
HOWEVER - the TF41 was not available until the late 1960s... it was created when the USAF decided it liked the A-7 and on 5 Nov. 1965 ordered its own version (A-7D) with an Allison-built modified version of the Spey.
Development of the TF41 started in June 1966, and this became the TF41-A-1, which was more powerful than any RR-built Spey (14,500 lbst vs 12,250 lbst).
The TF41 was first run at RR-Derby on 18 Oct. 1967, and production deliveries started in 1968 (the first A-7D with a TF41 first flew on 26 Sept. 1968 - the two prototypes had TF30 engines and flew in April 1968).
The 15,000 lbst TF41-A-2 for the USN's A-7Es followed shortly after.
