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Accident description
Last updated: 19 October 2017
Status:Final
Date:Tuesday 25 September 1979
Time:20:20 UTC
Type:Silhouette image of generic BE20 model; specific model in this crash may look slightly different
Beechcraft 200 Super King Air
Operator:Eagle Aircraft Services
Registration: G-BGHR
C/n / msn: BB-508
First flight: 1979
Total airframe hrs:47
Engines: 2 Pratt & Whitney Canada PT6A-41
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 2 / Occupants: 2
Airplane damage: Damaged beyond repair
Location:19 km (11.9 mls) S of Nantes (   France)
Phase: En route (ENR)
Nature:Training
Departure airport:London-Stansted Airport (STN/EGSS), United Kingdom
Destination airport:Exeter Airport (EXT/EGTE), United Kingdom
Narrative:
While following an IFR flight plan from Stansted (STN) to Exeter (EXT), at FL310, the pilot requested permission to carry out an emergency descent exercise. He was authorised by ATC to descend to FL120. From that time onwards, G-BGHR failed to respond to calls from the controllers and began circling and drifting southwards. On reaching the end of its endurance the aircraft crashed near Le Tremblay, France.

Probable Cause:

PROBABLE CAUSES: "The immediate cause of the accident was the aircraft striking the ground at a steep angle.
The cause of the accident was depressurization of the cabin at high altitude by the pilot. This exercise is too dangerous to be carried out on an aircraft in this class, in view of the useful consciousness time available to the pilots in the case of any failure of the oxygen circuit. In this particular case, the oxygen masks were not connected and the crew died in flight due to hypoxia."

Classification:
Flightcrew incapacitation
Loss of control

Sources:
» AAIB


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from London-Stansted Airport to Exeter Airport as the crow flies is 282 km (176 miles).

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