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Accident description
Last updated: 11 December 2017
Status:
Date:Thursday 27 November 1952
Type:Avro 685 York I
Operator:Surrey Flying Service
Registration: G-AMGM
C/n / msn: 1355
First flight: 1946
Engines: 4 Rolls-Royce Merlin
Crew:Fatalities: 0 / Occupants: 3
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 3
Airplane damage: Damaged beyond repair
Location:Lyneham (   United Kingdom)
Phase: Approach (APR)
Nature:Ferry/positioning
Departure airport:London-Stansted Airport (STN/EGSS), United Kingdom
Destination airport:Lyneham RAF Station (LYE/EGDL), United Kingdom
Narrative:
The Avro York was on a positioning flight from London-Stansted to Lyneham. Approaching Lyneham, the crew started a Ground Controlled Approach (GCA) to runway 07, intercepting the glide path at 2000 feet. At a distance of 400 m short of the runway, the aircraft suddenly attained a high rate of descent. The aircraft struck some treetops and crashed onto a ridge.

Probable Cause:

PROBABLE CAUSE: "The accident occurred as a result of the captain's allowing the aircraft to descend below critical height during a Ground Controlled Approach without having visual reference to the ground. The contributory causes were: 1) The captain was not warned by the talk-down controller that the aircraft was approaching break-off altitude. 2) The visibility at the threshold of runway 07 was less than airfield visibility which had been reported to the captain. 3) The aircraft was effected by a downdraft which caused it to sink below the glide path. The glide path at Lyneham allows for less obstacle clearance than is normal with a civil installation."

Sources:
» ICAO Accident Digest Circular 39-AN/34 (12-16)


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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 Lyneham RAF Station as the crow flies is 158 km (99 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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