ASN Wikibase Occurrence # 121307
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Date: | Thursday 24 March 2011 |
Time: | 16:55 |
Type: | Bell 206L-3 LongRanger III |
Owner/operator: | PHI Inc |
Registration: | N32041 |
MSN: | 51539 |
Year of manufacture: | 1991 |
Total airframe hrs: | 11510 hours |
Engine model: | Allison 250-C30 SER |
Fatalities: | Fatalities: 0 / Occupants: 3 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Main Pass 61A offshore platform, Gulf of Mexico -
United States of America
|
Phase: | Take off |
Nature: | Offshore |
Departure airport: | Main Pass 61A, GM |
Destination airport: | Main Pass 61A, GM |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:After the helicopter was refueled with the engine running, the pilot departed from an offshore oil platform. The pilot and the two passengers reported a loud bang just after the turboshaft-powered helicopter lifted off. The pilot immediately lowered the helicopter’s nose and entered an autorotation to the water below; as the helicopter descended, the pilot activated the helicopter’s float system. The floats inflated; however, the helicopter impacted the water and rolled inverted. Examination of the helicopter’s engine found no preaccident mechanical malfunctions or failures that would have precluded normal operation. A review of data downloaded from the engine’s data monitoring system revealed a “spike” in the engine’s turbine outlet temperature and torque readings. The oil platform was venting un-ignited methane gas at the time the helicopter departed the platform. It is likely that the helicopter’s engine experienced a compressor stall due to ingesting the methane gas, and the pilot immediately reacted by initiating an autorotation.
Probable Cause: The loss of engine power due to an engine compressor stall as a result of ingesting methane gas during takeoff.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | CEN11LA252 |
Status: | Investigation completed |
Duration: | 1 year and 4 months |
Download report: | Final report |
|
Sources:
NTSB
Location
Revision history:
Date/time | Contributor | Updates |
25-Mar-2011 08:59 |
gerard57 |
Added |
25-Mar-2011 14:09 |
TB |
Updated [Aircraft type, Operator, Source, Damage, Narrative] |
25-Mar-2011 14:42 |
Anon. |
Updated [Aircraft type, Registration, Cn, Nature, Damage, Narrative] |
25-Mar-2011 16:22 |
TB |
Updated [Aircraft type, Operator, Source, Narrative] |
02-Sep-2014 17:37 |
Aerossurance |
Updated [Source, Narrative] |
02-Sep-2014 17:39 |
Aerossurance |
Updated [Time, Location, Phase, Nature, Departure airport] |
02-Sep-2014 18:29 |
Aerossurance |
Updated [Source, Narrative] |
02-Sep-2014 18:30 |
Anon. |
Updated [Source, Narrative] |
18-Jan-2015 15:54 |
Aerossurance |
Updated [Source] |
21-Dec-2016 19:25 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
27-Nov-2017 16:46 |
ASN Update Bot |
Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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