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ASN Wikibase Occurrence # 215956
Last updated: 25 November 2021
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Time:11:15 UTC
Type:Silhouette image of generic G115 model; specific model in this crash may look slightly different
Grob G115E Tutor T1
Owner/operator:VT Aerospace Ltd./RAF
Registration: G-BYUU
MSN: 82105/E
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Minor
Location:near RAF Wittering, Cambridgeshire -   United Kingdom
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:RAF Wittering, Cambridgeshire
Destination airport:Wittering RAF Station (EGXT)
Investigating agency: AAIB
The pilot noted an uncommanded reduction in engine speed when returning to Wittering after a successful air test following an engine change. The engine initially recovered but, when the speed reduced again, the pilot made a PAN call. A further loss of power meant that he was unable to maintain height and he transmitted a MAYDAY and prepared to land in a field. The engine stopped prior to the landing, which was accomplished without damaging the aircraft.

Examination found that the engine oil sump drain cap was missing. Loss of the cap resulted in an oil leak and engine seizure. There is no requirement for the oil cap to be wire locked on the Grob 115E, which is equipped with a modified (inverted) engine oil system to cater for aerobatic manoeuvres.

The maintenance organisation considered that the most likely scenario is that the drain cap was not correctly secured after the engine was installed. The maintenance organisation is reviewing their procedures and, as part of their continuous airworthiness management, is liaising with the manufacturer about an alternative cap that can be wire locked. In the interim, they have introduced an independent check to ensure that the cap is correctly refitted

Damage sustained to airframe: Per the AAIB report the damage was restricted to a non-specific "Engine failure"


4. AAIB:
5. CAA:

Accident investigation:
Investigating agency: AAIB
Status: Investigation completed
Duration: 3 months
Download report: Final report


Revision history:

02-Oct-2018 17:30 Sirjames111 Added
02-Oct-2018 17:32 harro Updated [Aircraft type, Cn, Damage, Narrative]
02-Oct-2018 19:04 Iceman 29 Updated [Time, Source, Embed code, Narrative]
02-Oct-2018 19:05 Iceman 29 Updated [Location, Embed code]
02-Oct-2018 21:35 Geno Updated [Departure airport, Destination airport]
03-Oct-2018 17:51 Aerossurance Updated [Aircraft type, Operator, Location, Narrative]
10-Jan-2019 20:15 harro Updated [Departure airport, Destination airport, Narrative, Accident report, ]
10-Jan-2019 22:05 Dr. John Smith Updated [Time, Operator, Location, Source, Damage, Narrative]
24-Dec-2019 09:51 stehlik49 Updated [Operator, Departure airport, Operator]

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