ASN Wikibase Occurrence # 363745
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| Date: | Wednesday 22 April 1992 |
| Time: | 08:10 LT |
| Type: |  Bell UH-1B |
| Owner/operator: | Colony Services, Inc. |
| Registration: | N4028F |
| MSN: | 62-1948HC |
| Total airframe hrs: | 6979 hours |
| Engine model: | LYCOMING TH53-L110 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | La Belle, FL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT STATED THAT THE FLT PATH OF THE HELICOPTER WAS PERPENDICULAR TO POWER LINES THAT WERE AHEAD. THE FLIGHT CONTINUED AND HE FURTHER STATED THAT HE HEARD A LOUD EXPLOSION & THE ENG QUIT. HE PULLED THE COLLECTIVE CONTROL & CLEARED THE POWER LINES THEN LOWERED IT, & PRIOR TO IMPACT WITH THE GROUND, PULLED THE COLLECTIVE CONTROL TO CUSHION THE IMPACT. THE HELICOPTER LANDED HARD, BOUNCED, TOUCHED DOWN, ROLLED OVER ON THE LT SIDE, THEN NOSED OVER & CAME TO REST INVERTED. A SMALL FIRE WAS EXTINGUISHED BY SEVERAL INDIVIDUALS WHO RESPONDED TO THE ACCIDENT SITE. THE ENG WAS REMOVED & SENT TO THE MANUFACTURER'S FACILITY FOR EXAMINATION. EXAM OF THE ENG REVEALED THAT A MOUNTING BOSS ON THE AIR DIFFUSER FAILED DUE TO FATIGUE. THE LINE ATTACHED TO THE BOSS WAS THE INTERSTAGE BLEED AIR LINE. ALSO, A POWER TURBINE BLADE FAILED DUE TO FATIGUE. REVIEW OF THE ENG LOGBOOKS REVEALED THAT THIS ENG WAS REMOVED FROM ANOTHER HELICOPTER & INSTALLED IN THIS HELICOPTER 6 DAYS PRIOR TO THE ACCIDENT. THE ENG HAD ACCUMULATED ABOUT 10 HRS SINCE THEN & 703 HRS SINCE MAJOR OVERHAUL. ACCORDING TO THE ENG DAILY INSPECTION CHECKLIST, THE AIR DIFFUSER EXTERNAL VANE BRAZEMENTS SHOULD BE CHECKED FOR CRACKS.
Probable Cause: IMPROPER PREFLIGHT BY THE PILOT-IN-COMMAND, IN HIS FAILURE TO IDENTIFY A CRACK IN A BRAZED AREA SURROUNDING AN ATTACH POINT ON THE AIR DIFFUSER. CONTRIBUTING TO THE ACCIDENT FOLLOWING THE LOSS OF ENGINE POWER WAS OBSTACLES THAT WERE AHEAD OF THE FLIGHT PATH.
Accident investigation:
 |
|
Sources:
NTSB MIA92LA111
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 20:35 | ASN Update Bot | Added |
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