test instrumentation boom present on HB1001's nose. As the aircraft was used to test RCS returns, the unstealthy spin recovery chute was removed, and the aircraft was covered in radar-absorbent material. It first flew on 20 July 1978 with Dyson at the controls, who would be the only pilot to fly the aircraft. HB1002 was lost on 11 July 1979 during the aircraft's 52nd flight. A hydraulic leak caused an engine fire, resulting in the loss of hydraulic pressure, which in turn caused severe pitch oscillations. The pilot ejected safely, and the aircraft was destroyed. It was later discovered that an engine exhaust clamp had loosened, allowing the hot exhaust to migrate to the right engine compartment. The heat built up there, causing the hydraulic lines to fail. The debris from both aircraft was secretly buried somewhere within the Nellis Air Force Base Complex. Despite the crashes, Have Blue was considered a success. Senior Trend In October 1977, just prior to Phase 2 of the XST competition, Lockheed was tasked with exploring possible operational aircraft. Just a month later, on the day HB1001 was transported to Groom Lake, the Air Force awarded the company a contract under the code name Senior Trend. The Air Force wanted to exploit the revolutionary technologies developed during the Have Blue program. Tactical Air Command ordered five full-scale development and twenty production aircraft. Based on the Have Blue demonstrators, Senior Trend aircraft were different from their predecessors in several aspects. The wings exhibited less sweep to resolve a center-of-gravity problem discovered during tests. The front fuselage was shortened to give the pilot a better view, and the vertical stabilizers were canted outwards from the centerline. Additionally, provisions were made to include two weapons bays, each of which would accommodate a single laser-guided bomb, or the B61 tactical nuclear bomb. Beset by early construction problems, the first FSD aircraft was transferred to Groom Lake in May 1981 inside a C-5. Further problems, this time with fuel leaks, delayed the first flight. Under the control of Harold Farley, the aircraft took off on 18 June for its maiden flight, nine months after the July 1980 first flight originally envisaged. The first production F-117A was delivered in 1982, and operational capability was achieved in October 1983; the 59th and last F-117A was delivered in 1990. Specifications See also References Notes Citations Bibliography Aronstein, David C. and Albert C.