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ASN Wikibase Occurrence # 31902
Last updated: 5 July 2020
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Date:12-MAR-1981
Time:c. 15:12 LT
Type:Silhouette image of generic S76 model; specific model in this crash may look slightly different
Sikorsky S-76A
Owner/operator:Bristow Helicopters
Registration: G-BGXY
C/n / msn: 760021
Fatalities:Fatalities: 4 / Occupants: 4
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:South Kirkton, near Peterhead, Aberdeenshire -   United Kingdom
Phase: En route
Nature:Training
Departure airport:Aberdeen Airport, Dyce (ABZ/EGPD)
Destination airport:Aberdeen Airport, Dyce (ABZ/EGPD)
Narrative:
Broke up in flight after a main rotor blade separated due to a fatigue failure of the spindle, killing all four persons on board.

Blade spindle loading had increased due to wear of a dry lubricated bearing and load had increased due to a deburring technique that did not replicate that tested during certification.

AAIB recommended that spindles be inspected after 200 flying hours, instead of 300, and replaced completely after 300 hours.

Another S-76A (PT-HKB) had crashed on 23 Mar 1980 after a spindle failure. AAIB note that G-BGXY suffered its failure 12 Mar 1981 prior to maintenance instructions for a dimensional check being issued after the accident to PT-HKB (though they had been drafted some months prior).

Sources:

https://www.caa.co.uk/docs/HistoricalMaterial/G-BGXY.pdf
http://aviation-safety.net/wikibase/wiki.php?id=33292
https://www.gov.uk/aaib-reports/9-1983-sikorsky-s-76a-spirit-g-bgxy-12-march-1981


Revision history:

Date/timeContributorUpdates
27-Sep-2008 01:00 ASN archive Added
11-Jun-2010 12:32 TB Updated [Date, Time, Aircraft type, Registration, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative, Plane category, ]
17-Nov-2012 13:21 Dr. John Smith Updated [Time, Departure airport, Source, Narrative]
25-Nov-2012 12:09 TB Updated [Time, Source, Narrative]
04-Jun-2013 17:34 Dr. John Smith Updated [Source, Narrative]
23-Oct-2015 18:28 Dr.John Smith Updated [Location, Departure airport, Destination airport, Source, Narrative]
28-Mar-2016 18:24 Aerossurance Updated [Time, Location, Source, Narrative]
09-May-2016 13:20 Aerossurance Updated [Narrative]

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