ASN Wikibase Occurrence # 32231
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| Date: | Thursday 14 September 1995 |
| Time: | 18:50 LT |
| Type: |  MBB Bo 105CBS-2 |
| Owner/operator: | Hermann Hospital Life Flight |
| Registration: | N650MS |
| MSN: | S-650 |
| Year of manufacture: | 1984 |
| Total airframe hrs: | 3635 hours |
| Engine model: | ALLISON 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Houston, TX -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | (TE11) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during cruise flight at 800 feet MSL, a 'whine' was heard, which was 'slightly' different from the normal whine of the engines. A loud 'snap' or 'bang' was heard followed by severe vibrations. After determining a dual engine failure, the number one engine fire warning light illuminated, and the smell of smoke was noticed. An autorotation was initiated to a mall parking lot. During the autorotation, the pilot increased collective to clear trees bordering the parking lot. The helicopter touched down and slid approximately 200 feet to a stop. When the nurse opened the door to evacuate, smoke billowed into the cabin from the 'tunnel area.' After confirming that the flight crew was well clear, the pilot exited the helicopter. Examination of the helicopter revealed the drive shaft for the left engine had separated from the transmission input shaft flange. Examination of the main transmission lower housing revealed debris partially blocking the oil channel for the left side input pinion. Examination of both engines revealed internal thermal and foreign object damage.
Probable Cause: the failure of the main transmission's #1 (left) input pinion assembly, due to the partially blocked oil passage which reduced oil flow, resulting in the disconnect of the drive shaft.
Accident investigation:
 |
|
Sources:
NTSB FTW95FA394
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 26-Oct-2012 13:00 | TB | Updated [Time, Aircraft type, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative] |
| 04-May-2016 18:21 | Aerossurance | Updated [Time, Destination airport, Source, Narrative] |
| 04-May-2016 18:21 | Aerossurance | Updated [Narrative] |
| 04-May-2016 18:25 | Aerossurance | Updated [Narrative] |
| 11-Oct-2016 16:59 | TB | Updated [Time, Source, Narrative] |
| 11-Oct-2016 16:59 | TB | Updated [Narrative] |
| 09-Apr-2024 11:58 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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