ASN Wikibase Occurrence # 358634
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| Date: | Monday 17 July 1995 |
| Time: | 10:35 LT |
| Type: |  Bell 206B |
| Owner/operator: | Air Logistics |
| Registration: | N57536 |
| MSN: | 3124 |
| Total airframe hrs: | 9284 hours |
| Engine model: | Allison250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West Cameron, -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE IN LEVEL FLIGHT AT AN ALTITUDE OF 500 TO 700 FEET THE PILOT FELT A HIGH FREQUENCY VIBRATION IN THE TAIL ROTOR ANTI TORQUE PEDALS. SUBSEQUENTLY, A LOW PITCH 'HUM' AND A 'SHUDDERING VIBRATION' WAS FELT, 'FOLLOWED BY A LOUD BANG FROM THE REAR OF THE AIRCRAFT.' THE AIRCRAFT BEGAN TO 'ROTATE TO THE RIGHT', AND THE APPLICATION OF 'FULL LEFT PEDAL' HAD NO EFFECT IN STOPPING THE ROTATION. AFTER 'SEVERAL' 360 DEGREE TURNS, THE PILOT ATTEMPTED UNSUCCESSFULLY TO STREAMLINE THE HELICOPTER. AN AUTOROTATION WAS INITIATED, AND THE AIRCRAFT'S ROTATION WAS REDUCED TO A 'SLOW RIGHT MOTION SPIRAL OR FLAT SPIN.' DURING THE COMPLETION OF THE AUTOROTATION, THE LEFT FLOAT TOUCHED DOWN ON THE WATER FIRST AND THE HELICOPTER ROLLED INVERTED. EXAMINATION OF THE HELICOPTER REVEALED THAT A BOLT HAD SEPARATED FROM THE TAIL ROTOR AFT SHORT SHAFT FORWARD FLEX COUPLING AND THE DRIVE SHAFT WAS FRACTURED.
Probable Cause: THE DISCONNECT OF THE TAIL ROTOR DRIVE SYSTEM FOR UNDETERMINED REASONS. FACTORS WERE THE PILOT'S INABILITY TO MAINTAIN DIRECTIONAL CONTROL, AND THE LACK OF SUITABLE TERRAIN FOR THE FORCED LANDING.
Accident investigation:
 |
|
Sources:
NTSB FTW95LA303
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 16:33 | ASN Update Bot | Added |
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