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ASN Wikibase Occurrence # 190569
Last updated: 20 January 2022
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Time:14:36 UTC
Type:Silhouette image of generic RF47 model; specific model in this crash may look slightly different
Fournier RF-47
Registration: F-PNDF
MSN: 01
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Oordegem near Aalst -   Belgium
Phase: En route
Departure airport:Koksijde (EBFN)
Destination airport:Grimbergen (EBGB)
Investigating agency: AAIU Belgium
During a navigation flight, the engine began to sputter and lose power. The pilot searched for a suitable location for a forced landing and decided to land on a ploughed field. The engine completely stopped operating in final before touch-down. During the landing, the aeroplane flipped over, leaving the pilot slightly injured and the aeroplane significantly damaged.

The direct cause of the accident (the flip-over) is an improper pitch-up attitude (not enough “holding off”) during a forced landing on a soft terrain as a consequence of an engine failure. The engine breakdown (=indirect cause) was due to an insufficient gap between the valve rotators and the rocker arms. This caused an unwanted mechanical contact between these parts followed by a rapid wear of the valve keys ending in the engine failure.

Contributing safety factor:
Performing non-routine maintenance on critical aircraft components without having extensive technical experience.
Other safety factor:
The lack of technical documentation and/or guidance from the engine manufacturer to warn the mechanics about the “valve stem wear phenomenon”, possibly causing an insufficient gap between the valve rotators and the rocker arms.


Accident investigation:
Investigating agency: AAIU Belgium
Status: Investigation completed
Download report: Final report


Photo of F-PNDF courtesy

Schaffen - Diest (EBDT)
11 August 2012; (c) Mick Bajcar

F-PNDF at Keiheuvel Airfield, 30 July 2011 (c) H. Ranter/ASN

Revision history:

09-Oct-2016 07:09 jan olieslagers Added
09-Oct-2016 07:09 harro Updated [Operator, Total fatalities, Total occupants, Source, Plane category]
09-Oct-2016 07:12 harro Updated [Aircraft type, Cn, Other fatalities, Nature, Damage, Narrative, Photo, ]
09-Oct-2016 07:45 jan olieslagers Updated [Location, Damage, Narrative]
09-Oct-2016 07:46 harro Updated [Plane category]
21-Sep-2018 10:20 harro Updated [Phase]
14-Nov-2018 18:59 harro Updated [Time, Phase, Departure airport, Destination airport, Narrative, Accident report, ]

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