ASN Wikibase Occurrence # 370719
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| Date: | Tuesday 12 July 1988 |
| Time: | 08:30 LT |
| Type: |  Bell TH-1L |
| Owner/operator: | S. Eastern Helicopter Logging |
| Registration: | N465JR |
| MSN: | 157828 |
| Total airframe hrs: | 7676 hours |
| Engine model: | LYCOMING T53-L13BA |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Walterboro, SC -
 United States of America
|
| Phase: | Taxi |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE MILITARY SURPLUS HELICOPTER EXPERIENCED A 42 DEGREE GEAR BOX FAILURE WHILE LIFTING A LOAD OF LOGS. THE HELICOPTER SUBSEQUENTLY LANDED HARD AS THE PLT WAS ATTEMPTING TO AUTOROTATE TO A LDG. METALLURGICAL EXAMINATION OF THE GEARBOX REVEALED THAT A GEAR TOOTH ON THE INPUT QUILL PINION HAD FAILED DUE TO FATIGUE. NO EVIDENCE OF PREEXISTING DAMAGE OR IMPROPER OVERHAUL PROCEDURES WAS FOUND. THE GEARBOX TSO WAS ABOUT 440 HRS. THE 42 DEG GEAR BOX MAY BE OVER- HAULED ON CONDITION. INVESTIGATION REVEALED THAT THE HELICOPTER HAD EXPERIENCED IN EXCESS OF 13,000 LIFT CYCLES IN 380 HRS SINCE IT WAS PLACED IN SERVICE IN A LOGGING OPERATION. THE HELICOPTER HAD BEEN FAA-CERTIFICATED IN THE RESTRICTED CATEGORY FOR EXTERNAL LOAD OPERATIONS; HOWEVER, BELL RPTS THAT THE ACFT WAS NOT DESIGNED FOR REPEATED HEAVY LIFTING. THERE HAVE BEEN AT LEAST 2 OTHER SIMILAR FAILURES INVOLVING SURPLUS UH-1/TH-1 HELICOPTERS USED IN LOGGING OPERATIONS. THE LANDING SITE WAS STREWN WITH CUT TIMBER AND SMALL TREES.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB ATL88FA213
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 14:13 | ASN Update Bot | Added |
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