ASN Wikibase Occurrence # 370987
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 4 June 1988 |
| Time: | 13:00 LT |
| Type: |  Fairchild Hiller FH-1100 |
| Owner/operator: | Private |
| Registration: | N53EP |
| MSN: | 182 |
| Year of manufacture: | 1969 |
| Total airframe hrs: | 2023 hours |
| Engine model: | Allison 250-C18C |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lihue, HI -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Lihue, HI (LIH) |
| (KLIH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT SAID THAT THE AIRCRAFT WAS IN NORMAL CRUISE FLIGHT WHEN HE NOTICED THAT THE ENGINE WAS NO LONGER DRIVING THE ROTOR SYSTEM. THE PILOT ENTERED AN AUTOROTATION AND HAD TO STRETCH THE GLIDE SLIGHTLY TO A SUITABLE LANDING AREA ON AN OFF SHORE REEF. THE HELICOPTER MADE A HARD LANDING ON THE REEF IN ABOUT ONE FOOT OF WATER. ON SITE EXAMINATION OF THE HELICOPTER BY FAA AIRWORTHINESS INSPECTORS REVEALED THAT THE BENDIX COUPLING ON THE ENGINE TO TRANSMISSION SHAFT HAD RUPTURED ON THE ENGINE END OF THE SHAFT. METALLURGICAL EXAMINATION OF THE FAILED COUPLING REVEALED A FATIGUE FRACTURE IN A CIRCUMFERENTIAL ORIENTATION ON THE COUPLING DISK. THE DRIVE SHAFT COUPLINGS ARE THE SUBJECT OF A RECURRING AD WHICH MANDATES ALIGNMENT MEASUREMENTS OF THE DRIVE SHAFT EVERY 100 HOURS. THE LAST ALIGNMENT CHECK WAS DONE ABOUT 60 HOURS PRIOR TO THE ACCIDENT.
Probable Cause: FATIGUE FAILURE OF THE ENGINE TO TRANSMISSION DRIVE SHAFT ENGINE COUPLING DUE TO AN ANGULAR MISALIGNMENT OF THE DRIVE SHAFT.
Accident investigation:
 |
|
Sources:
NTSB LAX88LA212
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 16:50 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation