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Aviation History
1989
1989 - 0073.PDF
Instructor blamed for crash A Royal Air Force British Aero space Bulldog crashed after the qualified flying instructor (QFI) initiated a simulated emergency in what the investigation des cribed as a hazardous manner. The aircraft had taken off from RAF Linton-on-Ouse on September 29, 1986, on an intermediate handling test. Following a practice forced landing, an overshoot was initiated at between 150ft and 250ft. While climbing away at full power the QFI reported a simulated flock of birds ahead and, after some delay, the student attempted emergency avoiding action. The Bulldog was seen to enter a turn to the right, which steepened to wings vertical and to sideslip, before recovering to wings level close to the ground. The aircraft then hit two trees 150ft apart before striking the ground. The aircraft was exten sively damaged and both aircrew suffered major injuries. The aircraft was written off. The investigation stated that the accident had been caused by the student mishandling the controls in response to a simu lated emergency and that the QFI had insufficient height or time to effect a safe recovery. Considering the limited experi ence of the student, the investigation concluded that the test had been conducted in a hazardous manner. US Army clears Chinook The US Army has returned its Boeing Vertol CH-47D Chinooks to flying status follow ing the fleet's grounding as a precautionary measure on December 23, after Boeing reported that some trans missions may have been incor rectly assembled. The Army decided to ground the fleet until Boeing contractor teams could carry out an inspection. The US Army has cleared 219 of its 234 CH-47Ds for flight operations. Of the fifteen aircraft still awaiting inspection, ten are used for the instruction of aircraft mechan ics and five are in depot-level maintenance or are undergoing modification.^,, The inspection has been aimed at ensuring that the bear ing retainer bolt assembly has been properly installed. The bearing retainer bolt assembly provides for the proper alignment of the internal gear ing and bearings within the transmission. An incorrectly installed bear ing retainer bolt assembly has been eliminated as the cause of the US Army CH-47D crash at Chico, Texas, in February 1988. The investigation into the December 8, 1988, crash of the US Army CH-47D in Honduras is still under way and, according to the US Army, it is too early to tell whether the bearing retainer bolt assembly was to blame. • An Israeli Air Force Sikorsky CH-53 crashed near Eilat on December 29, 1988. The pilot, Capt Mordechai Sharon, was killed, and his co-pilot and two technicians were injured. The helicopter was lowering a border marker at the time. 'Phantom dive' caused Meteor crash The fatal crash of a Gloster Meteor T.7 during an airshow at Coventry Airport on May 30, 1988, was caused by a phenom enon known to 1950s Meteor pilots as "the phantom dive". This results from airflow being disturbed at high angles of attack by turbulence from the airbrakes. The investigation following the crash determined that the display had followed the normal sequence for about three minutes, but with airbrakes extended throughout, contrary to normal practice. Following a wingover to the right with gear and flaps extended, the aircraft began a descending run, the bank increased to 45° and the nose dropped. The Meteor turned rapidly through 90°, settled into a dive and crashed on an area of open ground. It was destroyed. There were no ejection seats fitted, and there was insufficient height or time for successful abandonment. There was no evidence of any pre-crash defect in the aircraft's airbrake system. Norway plans new silo radars Norway plans to build two radar and warning installations at an estimated cost of NKr308 million ($47 million). Norway's plans depend on the project being financed through Nato's infrastructure programme. The Norwegians have already built three radars of the silo type. The construction allows the radar to be lowered below ground for maintenance, either during extreme weather or when under attack. The proposed radars would be constructed in Troms in north ern Norway on the mountain summits of Njunis (5,139ft) and Innhesten (2,748ft). If Nato approves the programme, work could start in the middle of the year. The Norwegian Defence Establish ment calculates construction time for Innhesten to be 3] years and 5 years for the Njunis instal lation. Norway would provide power, water and roads. A cross-sectional view of the Norwegian silo radar FLIGHT INTERNATIONAL, 14 January 1989 15
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