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ASN Wikibase Occurrence # 217665
Last updated: 7 December 2019
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Type:Silhouette image of generic AFOX model; specific model in this crash may look slightly different
Halley Apollo Fox
Registration: OO-G60
C/n / msn: RO-270207
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Mochamps near St Hubert Airfield (EBSH) -   Belgium
Phase: En route
Departure airport:St Hubert Airfield (EBSH)
Destination airport:St Hubert Airfield (EBSH)
Investigating agency: AAIU Belgium
A few minutes after take-off from the St Hubert airfield, the pilot noticed that the engine oil pressure had dropped to zero. Shortly after, the engine stopped operating. Attempts to activate the emergency parachute failed leaving the pilot with no choice but to perform a forced landing.

The cause of the accident is an engine failure resulting from a complete loss of engine oil pressure due to a failure of an oil cooler hose connection. The hose failure occurred as a consequence of the modification of the engine lubrication system causing the oil cooler and associated oil hoses to be submitted to oil pressure instead of oil suction.
Because the emergency parachute system could not be activated, a forced landing on a very uneven terrain had to be executed, causing the aeroplane to flip over.

Contributing safety factors
- Unawareness of the hazards associated with the application of a non-validated modification.
- Inadequate position of the emergency parachute handle.
- Generally speaking, the absence of review of the different modifications by a competent/experienced third party, independent from the person who performed the modification.
- There is no formal technical standard such as Certification Specification for initial design and/or modification of ultralight aircraft.
- Regular generation of false alarms during take-offs.


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

Revision history:

12-Nov-2018 19:08 wrstefan Added
12-Nov-2018 19:12 harro Updated [Aircraft type, Cn, Total fatalities, Other fatalities, Location, Nature, Departure airport, Destination airport, Narrative, Accident report, ]
12-Nov-2018 19:14 harro Updated [Registration, Cn, Source]

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