ASN Wikibase Occurrence # 384657
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| Date: | Monday 12 April 1982 |
| Time: | 04:00 LT |
| Type: |  S.n.i.a.s. AS350D ASTAR |
| Owner/operator: | Mountain Coals Inc. |
| Registration: | N3605B |
| MSN: | 1215 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 729 hours |
| Engine model: | Lycoming LTS101-600A-2 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Alcoa, TN -
 United States of America
|
| Phase: | Approach |
| Nature: | Executive |
| Departure airport: | Middesboro, KY |
| Alcoa, TN | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE PREPARING TO LAND, THE PILOT EXPERIENCED A TAIL ROTOR DRIVE FAILURE AT A SPEED OF LESS THAN 60 KNOTS. AT THAT SPEED, HE WAS UNABLE TO MAKE THE NECESSARY RIGHT TURN FROM HIS POSITION TO LAND ON THE RUNWAY. INSTEAD, HE CLIMBED ABOUT 50 FT IN A LEFT TURN TO LINE-UP FOR A RUN-ON LANDING. AS HE SLOWED TO ABOUT 20 KNOTS AT LOW ALTITUDE, THE HELICOPTER BEGAN TO YAW HARD TO THE LEFT. THE COLLECTIVE WAS LOWERED TO TOUCHDOWN BEFORE CONTROL WAS LOST. DURING THE LANDING, THE HELICOPTER BOUNCED AND ROTATED ABOUT 90 DEGREES BEFORE COMING TO REST. AN EXAMINATION REVEALED THAT THE NUMBER 4 TAIL ROTOR DRIVE SHAFT BEARING, PN 6007-2RS1MT47CA, HAD SEIZED. THE TAIL ROTOR DRIVE SHAFT AND RUBBER MOUNTING COLLAR CONTINUED TURNING UNTIL THE SEIZED BEARING CHAFFED THROUGH THE COLLAR AND ALSO THE DRIVE SHAFT ITSELF. SUBSEQUENTLY, THE TAIL ROTOR DRIVE SHAFT, PN 350A34-0110-02, SHEARED. THE TAIL ROTOR DRIVE SHAFT BEARING WAS FACTORY LUBED AND SEALED AND HAD NO RETIREMENT TIME LIMIT. THE BEARING FAILED AFTER 729 HOURS OF OPERATION.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB ATL82DA100
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2024 13:30 | ASN Update Bot | Added |
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