ASN Wikibase Occurrence # 370071
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| Date: | Saturday 6 August 1988 |
| Time: | 20:30 LT |
| Type: |  Bell 222UT |
| Owner/operator: | Petroleum Helicopters, Inc. |
| Registration: | N3190K |
| MSN: | 47531 |
| Total airframe hrs: | 2712 hours |
| Engine model: | LYCOMING LT5-101-750C1 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Cameron, LA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | East Cameron245, GM |
| Lake Charles, LA (LCH | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
PLT STATED THAT THE ACFT PITCHED 20 DEG NOSE DOWN WITHOUT WARNING WHILE IN CRUISE FLT AT 1,200' AND 120 KTS. FOLLOWING RECOVERY, THE ACFT REQUIRED ADDITIONAL RT PEDAL TO STAY IN TRIM AND IT FLEW ABOUT 10 DEG NOSED DOWN IN LVL FLT. FLT DIVERTED TO THE OPR'S BASE AND LANDED SUCCESSFULLY. EXAMINATION REVEALED THAT THE RT HORZ STAB HAD SEPARATED JUST OUTBOARD OF THE TAILBOOM. METALLURGICAL EXAMINATION OF THE SEPARATION REVEALED MULTIPLE FATIGUE ORIGINS IN THE AREAS OF BOTH THE FORWARD AND AFT TOP SPAR CAP RIVET HOLES AND THAT THE CRACK IN THE AFT SPAR HAD BEEN PRESENT FOR SOME TIME. PREVIOUS FAILURES IN THIS AREA HAD BEEN ATTRIBUTED TO WORKING RIVETS CAUSING STRESS CONCENTRATIONS IN THE RIVET HOLES. PREVENTION OF THIS TYPE FAILURE IS EFFECTED BY REPLACING THE AFFECTED RIVETS IN A TIMELY MANNER. MAINTENANCE RECORDS REVEALED THAT THE LEFT HORIZONTAL STABILIZER HAD BEEN REPAIRED ON 3 PRIOR OCCASIONS, BUT THERE WERE NO RECORDS OF REPAIRS ON THE RT STABILIZER.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB FTW88IA145
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 06:28 | ASN Update Bot | Added |
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