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ASN Wikibase Occurrence # 42638
Last updated: 26 November 2021
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Date:26-AUG-1991
Time:07:15
Type:Silhouette image of generic B412 model; specific model in this crash may look slightly different
Bell 412
Owner/operator:Petroleum Helicopters (PHI)
Registration: N3909F
MSN: 33015
Fatalities:Fatalities: 1 / Occupants: 13
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Garden Banks, Gulf of Mexico, TX -   United States of America
Phase: Landing
Nature:Offshore
Departure airport:Ship Shole 248, Gulf of Mexico
Destination airport:Garden Banks, Gulf of Mexico
Investigating agency: NTSB
Narrative:
THE HELICOPTER WAS ON FINAL APCH TO AN OIL RIG IN THE GULF OF MEXICO, WHEN TAIL ROTOR AUTHORITY & DRCTNL CTL WERE LOST. AS THE CREW BEGAN AN AUTOROTATION TO THE WATER, THE HELICOPTER SPUN OUT OF CTL TO THE RGT. IT MADE 2 TO 3 REVOLUTIONS & IMPACTED THE WATER. THE RGT FLOATATION GEAR DEPLOYED, BUT THE LEFT FLOATATION GEAR DIDN'T DEPLOY, BECAUSE THE PNEUMATIC LINES WERE PULLED APART DRG IMPACT. SUBSEQUENLTY, THE HELICOPTER ROLLED OVER DRG TOUCHDOWN IN THE WATER. THE CREW & 10 OF 11 PSGRS ESCAPED THRU THE EMERG WINDOWS. THE OTR PSGR REMAINED IN HIS SEAT (INCAPACITATED FM INJURIES) & DROWNED. AN INVESTIGATION REVEALED THE #1 HANGER BEARING HAD OVERHEATED & DISINTEGRATED AT AN EXTREMELY HIGH TEMPERATURE. SUBSEQUENTLY, THE TAIL ROTOR DRIVE SHAFT FAILED. CAUSE: OVERHEATING AND SUBSEQUENT FAILURE OF THE NUMBER ONE TAIL ROTOR HANGER BEARING FOR AN UNDETERINED REASON, AND FAILURE OF THE TAIL ROTOR DRIVE SHAFT.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X17861
http://www.ntsb.gov/ntsb/GenPDF.asp?id=FTW91FA155&rpt=fi
http://www.ntsb.gov/ntsb/GenPDF.asp?id=FTW91FA155&rpt=fa


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
14-Aug-2010 13:54 Alpine Flight Updated [Other fatalities, Destination airport, Source]
29-Sep-2010 09:15 TB Updated [Operator, Location, Country, Nature, Departure airport]
29-Sep-2010 09:36 TB Updated [Damage]
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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