Dassault Falcon 900 Loss of Control In Flight

During climb, the flight crew noticed, on the warning panel, the 'PITCH FEEL' light, was illuminated. The captain disengaged the autopilot, checked the forces on the control column and re-engaged the autopilot. The "PITCH FEEL" warning light, remained continuously ON, during cruise and descent until the slats were extended. The Falcon reached a cruising altitude of FL400 until 47 minutes from take-off, when a normal descent to FL150 was initiated. During descent the Indicated Air Speed (IAS) increased from 240 knots to 332 knots. Approaching FL150, the first officer had a request for a further descent. Just before FL150 the ATC recleared the flight to continue descent to FL50. One second later autopilot disengaged and thereafter the aircraft was manually flown by the captain. Between FL150 and FL140, for approximately 24 seconds, the aircraft experienced 10 oscillations in pitch axis which exceeded the limit manoeuvring load factor. Maximum recorded values were: 4.7 g and -3:26 g. During the event the thrust power was reduced. At about FL130, after aircraft recovery from the encountered oscillations, the first officer declared an emergency. At the request of the flight crew, radar vectoring was provided by the ATC, and a visual approach and landing was performed on runway 08R. It appeared that the cabin interior had been completely destroyed, resulting in fatal injuries to seven passengers.

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