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ASN Wikibase Occurrence # 166926
Last updated: 13 June 2019
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Date:13-JUN-2014
Time:17:00 LT
Type:Silhouette image of generic H269 model; specific model in this crash may look slightly different
Hughes 269C
Owner/operator:Ramimmo
Registration: OO-JCS
C/n / msn: S-1749
Fatalities:Fatalities: 1 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Cerfontaine Airport (EBCF) -   Belgium
Phase: Unknown
Nature:Training
Departure airport:EBCF
Destination airport:EBCF
Investigating agency: AAIU Belgium
Narrative:
The purpose of the flight was to perform the yearly proficiency check of the pilot. The helicopter took off from the EBCF airfield with the pilot and an examiner on board. The proficiency check started with the performance of 2 circuit patterns. At the end of the second circuit pattern, when flying in short final of runway 30, the helicopter was seen falling vertically from a height of 10-15m.
The pilot suffered serious injuries and the examiner was fatally injured. The helicopter was destroyed.

The inspection of the wreckage had determined that the rotor RPM was very low and that the engine was stopped before impact.
Extensive investigation could not found any technical cause explaining the low rotor RPM.
However, one spark plug of the engine was found unserviceable during a post-accident test on a test bench.
Interview of the pilot determined that the low rotor RPM was perceived in short final by feeling shocks in the helicopter structure. This was detected too late, at too low height, both by the pilot and the examiner to recover a normal rotor RPM. The examiner took control a few moments before the crash.
The cause of the low rotor RPM could not be determined with certainty, however, it is likely that it was caused by a lack of appropriate throttle action by the pilot when pulling the collective to correct the glide path.
The cause of the engine stoppage could be related to an uncommanded engine shut down due to the examiner rapid roll on of the throttle.
It might be possible that the unserviceable spark plug is a contributing factor, but not the cause, to the low rotor RPM and the uncommanded engine shut down.

Sources:

http://mobilit.belgium.be/sites/default/files/14-2.pdf

http://www.lalibre.be/actu/belgique/crash-d-helicoptere-a-cerfontaine-un-mort-et-un-blesse-grave-539b18683570ceda9d83474e
https://www.rtbf.be/info/regions/detail_crash-d-helicoptere-a-cerfontaine-un-des-deux-occupants-est-decede?id=8291578
https://helispot.be/hs/page/detail.asp?oid=C3F2E5&sub=logboek

Accident investigation:
cover
  
Investigating agency: AAIU Belgium
Status: Investigation completed
Duration: 3 years and 10 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
13-Jun-2014 16:29 Belga11 Added
13-Jun-2014 16:29 harro Updated [Aircraft type, Total fatalities, Total occupants, Other fatalities, Nature, Source, Narrative]
13-Jun-2014 18:20 harro Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Source]
13-Jun-2014 18:20 harro Updated [Total fatalities]
15-Jun-2014 07:25 helispot Updated [Aircraft type, Operator, Phase, Departure airport, Destination airport, Source, Damage, Narrative]
15-Jun-2014 07:27 harro Updated [Operator]
07-Oct-2015 17:17 harro Updated [Source, Narrative]
25-Apr-2018 19:35 harro Updated [Time]

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