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ASN Wikibase Occurrence # 179559
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Type:Silhouette image of generic R66 model; specific model in this crash may look slightly different    
Robinson R66
Owner/operator:London Rock Supplies Ltd.
Registration: G-LROK
MSN: 0581
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Denham Aerodrome, Buckinghamshire -   United Kingdom
Phase: Take off
Departure airport:Denham, Buckinghamshire (EGLD)
Destination airport:
Investigating agency: AAIB
Confidence Rating: Accident investigation report completed and information captured
Robinson R66 G-LROK rolled over on take off from Denham Aerodrome,Gerrards Cross, Buckinghamshire. The helicopter was involved in an accident that left it on its side. The aircraft is registered to London Rock Supplies Limited. One of the two occupants onboard the aircraft received minor injuries. Damage to the main rotor blades, drive train, transmission bay, tail boom and windshield.

The student pilot had commenced training for his PPL(H) on the R44, in which he had flown solo, before changing to the R66 some 18 flying hours before the accident flight. On the day, he completed five dual circuits with his instructor. They then landed and the instructor exited the helicopter, to allow the student to conduct his first solo flight on the R66. As the student lifted into the hover, the helicopter rolled right and the rotors struck the ground. The helicopter came to rest on its side and the student, who sustained minor injuries, was able to vacate the cabin. The instructor, who was standing 50 yards away, commented that it appeared a dynamic rollover had occurred.

In 1982 the Robinson Helicopter Company issued Safety Notice SN-9, concerning dynamic rollover. It states:

‘A dynamic rollover can occur whenever the landing gear contacts a fixed object, forcing the aircraft to pivot about the object instead of about its own center of gravity…Once started, dynamic rollover cannot be stopped by application of opposite cyclic alone…Quickly applying down collective is the most effective way to stop dynamic rollover.’


1. AAIB:
2. CAA:

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



Photo of G-LROK courtesy

High Wycombe - Wycombe Air Park / Booker (EGTB / HYC)
14 June 2018; (c) Mick Bajcar

Revision history:

14-Sep-2015 17:38 Aerossurance Added
14-Sep-2015 19:09 APikesley Updated [Date]
14-Sep-2015 21:07 Geno Updated [Time, Operator, Total occupants, Location, Phase, Departure airport, Source, Narrative]
15-Sep-2015 11:57 Dr. John Smith Updated [Nature, Source, Embed code, Narrative]
15-Sep-2015 11:58 Dr. John Smith Updated [Source, Embed code, Narrative]
03-Feb-2016 15:08 Anon. Updated [Damage]
11-Feb-2016 17:24 Dr.John Smith Updated [Time, Location, Nature, Departure airport, Source, Narrative]
11-Aug-2020 09:52 Aerossurance Updated [Location, Narrative]

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