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ASN Wikibase Occurrence # 121307
Last updated: 15 September 2021
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Date:24-MAR-2011
Time:16:55
Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206L-3 LongRanger III
Owner/operator:PHI Inc
Registration: N32041
MSN: 51539
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
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 helicopterís nose and entered an autorotation to the water below; as the helicopter descended, the pilot activated the helicopterís float system. The floats inflated; however, the helicopter impacted the water and rolled inverted. Examination of the helicopterís engine found no preaccident mechanical malfunctions or failures that would have precluded normal operation. A review of data downloaded from the engineís data monitoring system revealed a ďspikeĒ in the engineís 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 helicopterís 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.

Sources:

NTSB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
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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