ASN Wikibase Occurrence # 58850
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| Date: | Saturday 10 November 2007 |
| Time: | 14:30 |
| Type: |  Bell 206B JetRanger II |
| Owner/operator: | Celtic Helicopters Ltd |
| Registration: | EI-BYJ |
| MSN: | 1897 |
| Year of manufacture: | 1976 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Location: | North of Balbriggan, Co. Dublin -
 Ireland
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Test |
| Departure airport: | |
| Investigating agency: | AAIU |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The pilot, having completed a commercial flight earlier that morning, was requested by a member of the operators maintenance staff to carry out a local test flight on EI-BYJ, to confirm that the maximum and minimum autorotation RPM was set correctly, among other requirements. His passenger, a qualified helicopter engineer, was on board to record various readings.
The pilot stated that he entered an autorotation at 2,000 ft to observe rotor RPM by lowering the collective lever and closing the throttle to idle. He observed the NR (Rotor RPM) rising sharply towards 107% (maximum RPM Rotor) and applied collective pitch to stop this rise. While descending at 60 mph IAS he observed a sharp reduction in the NR, followed by the Rotor Low RPM warning cautions (audio and light), as the NR decayed towards 80% (minimum is 90% Rotor RPM). He estimated that the time from applying collective to the sharp reduction in NR was 2 -3 seconds.
While initiating recovery he felt two severe aircraft vibrations in quick succession. N1 and NR stabilised at 100% and the helicopter flew normally as he routed back to his base, where he carried out some ground work prior to landing.
A post flight inspection by the operator showed that the tail boom upper skin was wrinkled, the aft fuselage skin also showed signs of wrinkling, and that there were indications that the engine to transmission driveshaft had contacted the isolation mount.
Accident investigation:
 |
|
Sources:
http://www.aaiu.ie/upload/general/11347-0.pdf
History of this aircraft
Other occurrences involving this aircraft
| 13 June 2004 | EI-BYJ | Celtic Helicopters Ltd | 0 | Inniskeen, Co. Monaghan | |
sub |
| Fuel starvation | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Mar-2009 23:57 | harro | Added |
| 23-Aug-2014 17:21 | Aerossurance | Updated [Operator, Narrative] |
Corrections or additions? ... Edit this accident description
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