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A U.S. Air Force YF-97 Starfire on test flight; later to be redesignated the F-94 | |
Role | All-weather interceptor |
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National origin | United States |
Manufacturer | Lockheed Corporation |
First flight | 16 April 1949 |
Introduction | May 1950 |
Retired | 1958 (USAF)1959 (ANG) |
Primary users | United States Air Force Air National Guard |
Produced | 1949–1954 |
Number built | 855 |
Developed from | Lockheed T-33 Shooting Star |
On 8 October 1948, the United States Air Force (USAF) issued a new general operating requirement that called for a radar-equipped interceptor to replace the aging Northrop F-61 Black Widow and North American F-82 Twin Mustang. This new interceptor was specifically designed to counter the emergence of new Soviet aircraft such as the Tupolev Tu-4 bomber (reverse engineered from the Boeing B-29 Superfortress). The Curtiss-Wright XF-87 Blackhawk had been developed with the intention of becoming the USAF's first jet-powered night fighter, but its performance was subpar. Accordingly, Lockheed was approached by the service with a request to design a jet night fighter on a crash program basis.
The resulting aircraft was derived from the TF-80C (later designated T-33A Shooting Star) which was a two-seat trainer version of the F-80 Shooting Star. Designated F-94 Starfire, it was redesigned with a lengthened nose area to accommodate the addition of guns, radar, and an automatic fire control system. In November 1948, the P-94 was met with the approval of James Forrestal, United States Secretary of Defense. Having observed the conversion to be relatively straightforward, USAF officials chose to issue a letter contract to Lockheed during January 1949. Months later, a definitive contract for 150 production aircraft was received. By December 1949, the number on order had risen to 368 aircraft.
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The C-5 is a large, high-wing cargo aircraft with a distinctive high T-tail fin (vertical) stabilizer, with four TF39 turbofan engines mounted on pylons beneath wings that are swept 25°. (The C-5M uses newer GE CF6 engines.)
The first C-5A was delivered to the USAF on 17 December 1969. Wings were built up in the early 1970s at Altus AFB, Oklahoma;
Following a study showing that 80% of the C-5 airframe's service life was remaining,[99] Air Mobility Command (AMC) began an aggressive program to modernize all remaining C-5Bs and C-5Cs and many of the C-5As.