Date:	Tuesday 14 January 1958
Time:	day
Type:	Bristol 171 Sycamore Mk 3A
Owner/operator:	A&AEE Boscombe Down
Registration:	WT939
MSN:	12896
Fatalities:	Fatalities: 0 / Occupants: 2
Aircraft damage:	Destroyed
Location:	Boscombe Down, Wiltshire -   United Kingdom
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Military
Departure airport:	Boscombe Down Wiltshire (EGDM)
Destination airport:
Confidence Rating:	Information is only available from news, social media or unofficial sources

Narrative:
Ex-G-ALTB, first registered as such 17/11/1950 to the Bristol Aeroplane Co, Filton, Bristol, Gloucestershire (C of R 12809/1, larer R.2778/1). Registration cancelled as "transferred to Air Ministry as WT939" on 22/2/1953. Sent to Edmonton, Alberta, Canada, for cold weather trials

Written off 14/01/1958: The crew of two was engaged on a conversion sortie for a newly-appointed test pilot, and the aircraft captain was demonstrating rearwards flight. The pilot exceed the maximum speed during rearward flight at Boscombe Down, Wiltshire and lost control. WT939 struck the ground and rolled over. One of the two crew were injured.

1. Halley, James (1999) Broken Wings – Post-War Royal Air Force Accidents Tunbridge Wells: Air-Britain (Historians) Ltd. p.194 ISBN 0-85130-290-4.
2. Royal Air Force Aircraft WA100-WZ999 (James J Halley, Air Britain, 1983 p 98)
3. Category Five; A Catalogue of RAF Aircraft Losses 1954 to 2009 by Colin Cummings p.277
4. http://www.ukserials.com/losses-1958.htm
5. https://cwsprduksumbraco.blob.core.windows.net/g-info/HistoricalLedger/G-ALTB.pdf
6. https://www.flightglobal.com/pdfarchive/view/1953/1953
7. https://www.helis.com/database/cn/48224/
8. http://www.ukserials.com/results.php?serial=WT

Date/time	Contributor	Updates
21-Apr-2013 18:21	Dr. John Smith	Added
19-Oct-2014 17:29	Route	Updated [Operator]
30-Aug-2020 20:06	Dr. John Smith	Updated [Time, Operator, Source, Narrative]