Date: December 22, 1999
Time: 18:38
Location: Great Hallingbury, United Kingdom
Operator: Korean Air
Flight #: 8509
Route: London, England - Milan, Italy
AC Type: Boeing 747-2B5F
Registration: HL-7451
cn / ln: 22480/448
Aboard: 4   (passengers:0  crew:4)
Fatalities: 4   (passengers:0  crew:4)
Ground: 0
Summary: Shortly after taking off the ADI comparator alarm sounded three times. Shortly afterwards, the warning sounded a further two times. As the captain initiated a procedural turn to the left, the comparator warning sounded 9 more times.. The aircraft then banked left progressively and entered a descent until it struck the ground in a 40 degree nose down attitude at a high rate of speed. The pilots did not respond appropriately to the comparator warnings during the climb after takeoff from Stansted despite prompts from the flight engineer. The commander, as the handling pilot, maintained a left roll control input, rolling the aircraft to approximately 90 of left bank and there was no control input to correct the pitch attitude throughout the turn. The first officer either did not monitor the aircraft attitude during the climbing turn or, having done so, did not alert the commander to the extreme unsafe attitude that developed.

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