ASN Wikibase Occurrence # 369441
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| Date: | Monday 5 December 1988 |
| Time: | 16:06 LT |
| Type: |  MBB Bo 105S |
| Owner/operator: | Air Logistics |
| Registration: | N2785B |
| MSN: | S-636 |
| Total airframe hrs: | 1751 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | South Marsh 113, -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | South Marsh 7, GM |
| Patterson, LA (KPTN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AS THE HELICOPTER WAS CLIMBING THRU ABOUT 500 FT, THE PLT HEARD A LOUD NOISE, FELT A SEVERE VIBRATION & SAW DEBRIS FALLING IN FRONT OF THE ACFT. HE BEGAN AN AUTOROTATION & DEPLOYED THE EMERGENCY FLOATS BEFORE LANDING ON WATER IN THE GULF OF MEXICO. THE HELICOPTER REMAINED AFLOAT & THE OCCUPANTS DEPLOYED & ENTERED A RAFT FROM WHICH THEY WERE PICKED UP ABOUT 1 HR LATER. AN INVESTIGATION REVEALED THAT ONE OF THE TAIL ROTOR BLADES HAD SEPARATED & STRUCK A MAIN ROTOR BLADE. THE RESULTING IMBALANCE CAUSED THE GEARBOX TO SEPARATE & FALL IN THE WATER. THE 90 DEG GEARBOX, TAIL ROTOR HUB AND TAIL ROTOR BLADES WERE NOT RECOVERED FROM THE GULF OF MEXICO.
Probable Cause: FAILURE AND SEPARATION OF ONE OF THE TAIL ROTOR BLADES FOR UNDETERMINED REASONS. THR RESULTING IMBALANCE AND VIBRATION CAUSED THE SEPARATION OF THE 90 DEGREE GEARBOX AND A PORTION OF THE VERTICAL PYLON WHICH NECESSITATED THE EMERGENCY AUTOROTATION TO THE WATER.
Accident investigation:
 |
|
Sources:
NTSB FTW89LA031
History of this aircraft
Other occurrences involving this aircraft
| 7 May 1989 | N2785B | Air Logistics LLC | 1 | West Cameron Blk, LA | |
w/o |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 14:37 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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