ASN Wikibase Occurrence # 214791
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| Date: | Monday 6 April 2015 |
| Time: | 15:45 LT |
| Type: |  Robinson R22 Mariner |
| Owner/operator: | Private |
| Registration: | F-GLHC |
| MSN: | 2281M |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Le Plessis Belleville Airport, Oise, Hauts-de-France -
 France
|
| Phase: | Standing |
| Nature: | Private |
| Departure airport: | Le Plessis Belleville Airport (LFPP) |
| Le Plessis Belleville Airport (LFPP) | |
| Investigating agency: | BEA |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The pilot performs the start-up for a local flight departing from the Plessis-Belleville aerodrome (LFPP). The collective is in low braked position. The cyclic is also braked. It checks the magnetos at 75% of the engine speed and checks that the freewheel is working properly. When it engages the governor (or governor, aiming at keeping the rotor speed constant by regulating the power of the engine), the helicopter starts to "move" to the left. He ensures that the collective, always braked, is well positioned at full speed and finds that the helicopter is animated by stronger movements. He pulls on the collective but not noticing any improvement, he lowers it. The helicopter then switches to the left side.
The 61-year-old pilot, with a private helicopter pilot license, had 81 hours of flight type at the time of the accident. He said he was surprised by the speed of the engine revving after the governor was engaged, and did not think to reduce the throttle.
The pilot's decision to increase the collective pitch while the helicopter was encountering probably vibratory movements, could lead to increase these movements, or even to create a resonance phenomenon on the ground. The pilot then lost control of the helicopter.
Vibratory phenomena sometimes appear when starting the engine of the helicopter. Several factors can contribute to this: imperfections in the floor covering, the adjustment of the wing or improvements in drag dampers. In general, these vibrations stop after start-up, when the rotor and the motor have exceeded a certain speed. If they get worse, it is generally recommended to stop the start up.
Accident investigation:
 |
|
Sources:
1. BEA France: https://www.bea.aero/fileadmin/documents/docspa/2015/BEA2015-0141/pdf/BEA2015-0141.pdf
2. http://helihub.com/2015/04/06/06-apr-15-f-glhc-robinson-r22m-le-plessis-belleville-france/
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Aug-2018 22:18 | Dr.John Smith | Added |
Corrections or additions? ... Edit this accident description
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