ASN Wikibase Occurrence # 166926
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| Date: | Friday 13 June 2014 |
| Time: | 17:00 LT |
| Type: |  Hughes 269C |
| Owner/operator: | Ramimmo |
| Registration: | OO-JCS |
| MSN: | S-1749 |
| Fatalities: | Fatalities: 1 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Cerfontaine Airfield, Namur -
 Belgium
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Cerfontaine EBCF |
| Cerfontaine Airfield (EBCF) | |
| Investigating agency: | AAIU Belgium |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Accident investigation:
 |
|
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
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 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] |
| 09-Nov-2022 01:06 | Ron Averes | Updated [Location, Departure airport, Destination airport] |
| 09-Nov-2022 01:07 | Ron Averes | Updated [Location] |
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