ASN Wikibase Occurrence # 381341
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Date: | Sunday 24 July 1983 |
Time: | 21:30 LT |
Type: | Cessna U206 |
Owner/operator: | Rust's Flying Service |
Registration: | N4661Z |
MSN: | |
Engine model: | Lycoming O-320 |
Fatalities: | Fatalities: 0 / Occupants: 0 |
Aircraft damage: | Unknown |
Category: | Accident |
Location: | Near Iliamna, AK -
United States of America
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Phase: | |
Nature: | Unknown |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE ENG LOST POWER JUST AFTER A WATER TAKEOFF. THE ACFT LANDED STRAIGHT AHEAD IN MUSKEG & TUNDRA COLLAPSING THE FLOATS. ENG TEARDOWN REVEALED A METALLIC 'NUGGET' IN THE LEFT INTAKE MANIFOLD BETWEEN THE #4 & #6 PORTS. NUMEROUS MARKS WERE FOUND ON THE INSIDE OF BOTH INTAKE MANIFOLDS. THERE WAS MINOR DENTING, SCRATCHING & PEENING ON THE INTERIOR OF THE 90 DEG ELBOWS FROM BOTH ENDS OF THE CROSSOVER TUBE, INTAKE VALVE PORTS, SEATS & VALVE FACES OF CYLS 4,5 & 6. THE NUGGET WAS COMPOSED OF THE SAME MATERIAL AS THE AIRBOX ASS'Y, CESSNA P/N 1250705, WHICH CONTAINED TWO HOLES APRX 2-1/2 SQUARE INCHES EACH IN THE AIRBOX WALL. THE HOLES WERE CAUSED BY FATIGUE CRACKS. THE SOURCE OF LOADING CAUSING THE FATIGUE CRACKPROPAGATION WAS DUE TO MEMBRANE &/OR BENDING LOADS IN THE AIRBOX WALL CAUSED BY OUT-OF-PLANE DEFORMATION. THESE DEFORMATION WERE MOST LIKELY CAUSED BY EXCITING A NATURAL MODE OF VIBRATION IN THE WALL. THREE DUCT FAILURES WERE REPORTED TO THE FAA IN 1983, TWO OF WHICH WERE IN C-210 ACFT.
Probable Cause:
Accident investigation:
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Investigating agency: | NTSB |
Report number: | ANC83FA131 |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
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Sources:
NTSB ANC83FA131
Revision history:
Date/time | Contributor | Updates |
02-Apr-2024 02:23 |
ASN Update Bot |
Added |
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