ASN Wikibase Occurrence # 360958
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| Date: | Wednesday 29 December 1993 |
| Time: | 18:55 LT |
| Type: | Kaman HH-43B/F |
| Owner/operator: | Scott Paper Co. |
| Registration: | N5197W |
| MSN: | 59-1564 |
| Total airframe hrs: | 6068 hours |
| Engine model: | LYCOMING T53-L-13B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mobile, AL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Mt. Vernon, AL |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER WAS BEING USED FOR EXTERNAL LIFT, LONG-LINE LOGGING OPERATIONS. AFTER LIFTING A LOAD OF LOGS, THE PILOT EXPERIENCED CONTROL PROBLEMS WITH THE HELICOPTER. THE LOAD, AND THEN THE LONG LINE, WERE JETTISONED, AND AN EMERGENCY DESCENT WAS BEGUN TO THE REMOTE, TEMPORARY LOG HELIPORT. AS THE PILOT ATTEMPTED TO SLOW THE HELICOPTER'S DESCENT RATE, CONTROL WAS LOST. POWER WAS REDUCED, A LEVEL ATTITUDE REGAINED, AND THE MAIN ROTOR BLADES CONTACTED THE GROUND. THE FUSELAGE THEN LANDED HARD. THE WRECKAGE WAS EXAMINED, WHICH REVEALED THAT THE COTTER PIN FOR THE RIGHT ROTOR HEAD TEETER PIN RETAINING NUT WAS ABSENT. ABSENCE OF THE COTTER PIN WOULD ALLOW THE TEETER PIN RETENTION NUT TO LOSE TORQUE, AND EVENTUAL SEPARATION OF THE ROTOR HEAD FROM THE HELICOPTER.
Probable Cause: AN INADEQUATE MAJOR REPAIR BY COMPANY MAINTENANCE PERSONNEL WHO FAILED TO INSTALL THE COTTER PIN WHICH SECURED THE RETAINING NUT OF THE RIGHT MAIN ROTOR HUB TEETER PIN.
Accident investigation:
 |
|
Sources:
NTSB ATL94LA035
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 13:15 | ASN Update Bot | Added |
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