ASN Wikibase Occurrence # 42638
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| Date: | Monday 26 August 1991 |
| Time: | 07:15 |
| Type: |  Bell 412 |
| Owner/operator: | Petroleum Helicopters (PHI) |
| Registration: | N3909F |
| MSN: | 33015 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 10337 hours |
| Engine model: | P&W PT6T-3B |
| Fatalities: | Fatalities: 1 / Occupants: 13 |
| 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 |
| Garden Banks, Gulf of Mexico | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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/time | Contributor | Updates |
|---|---|---|
| 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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