ASN Wikibase Occurrence # 366172
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| Date: | Thursday 20 September 1990 |
| Time: | 13:30 LT |
| Type: |  Cessna A188B |
| Owner/operator: | Gardner Flying Services |
| Registration: | N8677G |
| MSN: | 18801309T |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 2701 hours |
| Engine model: | CONTINENTAL IO-520D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hertsboro, AL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Eaufala, AL (KEUF) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING AERIAL APPLICATION ONE PROPELLER BLADE SEPARATED FROM THE ACFT. THE ACFT COLLIDED WITH A TREE DURING THE FORCED LANDING ROLL. EXAM OF THE PROPELLER REVEALED THAT A FATIGUE FRACTURE ORIGINATED AT A SCORE MARK IN THE HUB THREADS OF THE BLADE. DEPOSITS WERE FOUND IN THE FRACTURE ENRICHED BY CARBON & OXYGEN. GRAPHITE, THE LUBRICANT USED IN THE PROPELLER ASSEMBLY, IS CARBON BASED. TESTING SHOWED THAT THE BLADE'S HARDNESS & TENSILE STRENGTH WAS BELOW MFG SPECIFICATIONS. THE SAFETY BOARD BELIEVES THAT THE FRACTURE WAS OPENED UP DURING THE LAST PROPELLER OVERHAUL, ABOUT 583 OPERATING HOURS PRIOR TO THE ACCIDENT. ALSO, OIL REQUIRED IN THE HUB TO ALLOW EARLY DETECTION OF BLADE CRACKS WAS ABSENT.
Probable Cause: FATIGUE FAILURE OF THE PROPELLER BLADE WHICH RESULTED FROM IMPROPER OVERHAUL PROCEDURES, AND THE ABSENCE OF OIL IN THE PROPELLER HUB WHICH WOULD ALLOW THE DETECTION OF BLADE CRACKS.
Accident investigation:
 |
|
Sources:
NTSB ATL90LA173
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 18:07 | ASN Update Bot | Added |
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