ASN Wikibase Occurrence # 76234
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| Date: | Monday 5 June 2006 |
| Time: | 12:20 |
| Type: |  Eurocopter EC 145 |
| Owner/operator: | Sécurité Civile |
| Registration: | F-ZBPB |
| MSN: | 9007 |
| Year of manufacture: | 2002 |
| Fatalities: | Fatalities: 3 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Gavarnie, Hautes-Pyrénées 65 -
 France
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Ambulance |
| Departure airport: | |
| Investigating agency: | BEAD |
| Confidence Rating: |  Accident investigation report completed and information captured |
Crashed in mountains (west slope of Petit Astazou).
Causes of the event
The accident resulted from a loss of yaw control.
The investigation identified two possible hypotheses as to the cause of the loss of control:
- a rock fall(s) damaging the CARs or the main rotor:
- the occurrence of a long-term stationary flight, in an area unfavourable to this risk, may have been a determining factor.
- reaching the efficiency limit of the RAC during the clearance manoeuvre :
The absence of a flight-parameter recorder did not make it possible to determine the circumstances and determining factors for this hypothesis. However, it was considered that :
- the theoretical margin available could have been consumed by the cumulative effects:
- of unfavourable local aerology (turbulence, downdrafts);
- the installation of yaw inertia;
- of the clearance trajectory used (straight translation);
- weak right tailwind.
- The absence of a reconnaissance passage did not allow the pilot to assess the local aerology and may have contributed to an overestimation of the available margin;
-the pilot's lack of expertise in the mountain rescue mission on BK117 C2 may have led to a lack of comfort which contributed to reaching this limit:
-by overdosing the power control;
-by a difficulty to identify the foot margin and to control the yaw rate under autopilot;
-by incomplete and/or late rudder action, allowing yaw inertia to build up.
-the phenomenon of "false foot stop" (forces felt on the rudder pedals in transit) may have been encountered and contributed to a momentarily incomplete rudder action;
-it is likely that the yaw rotation was initiated by the pilot; late detection by the pilot of the yaw control problem encountered is then likely the cause of the lack of backup manoeuvring when the aircraft first found itself facing the valley (engagement of forward translation). Second, the margins in relation to the terrain did not allow the pilot to apply the control magnitudes required to stop the rotation, or, if they were applied, the impact with the terrain could not be avoided.
Accident investigation:
 |
|
Sources:
http://www.aerosteles.net/fiche.php?code=gavarnie-ec145
https://www.defense.gouv.fr/english/content/download/105576/1032042/Rapport%20public%20BEAD-air-S-2006-013-A.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Aug-2010 10:30 | TB | Added |
| 01-Nov-2012 11:26 | TB | Updated [Aircraft type, Location, Source, Narrative] |
| 23-Nov-2012 09:56 | TB | Updated [Aircraft type] |
| 13-Sep-2017 08:47 | harro | Updated [Total occupants] |
| 27-Jul-2020 15:04 | KagurazakaHanayo | Updated [Time, Source, Narrative] |
| 27-Jul-2020 15:36 | harro | Updated [Phase, Nature, Narrative, Accident report, ] |
| 24-Oct-2020 12:21 | Aerossurance | Updated [Aircraft type, Accident report] |
| 09-Jun-2022 08:03 | Ron Averes | Updated [Location] |
Corrections or additions? ... Edit this accident description
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