ASN Wikibase Occurrence # 359903
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| Date: | Friday 26 August 1994 |
| Time: | 20:00 LT |
| Type: |  Cessna 150J |
| Owner/operator: | Eagle Wings Aviation |
| Registration: | N50446 |
| MSN: | 15069309 |
| Total airframe hrs: | 3324 hours |
| Engine model: | Continental O-200-A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Spruce Pine, NC -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING CRUISE FLIGHT OVER MOUNTAINOUS TREE COVERED TERRAIN, THE ENGINE LOST POWER. IT CONTINUED TO DECREASE TO IDLE AS THE PILOT GLIDED THE ACFT TO A SMALL CLEARING. THE AIRPLANE WAS LANDED UPSLOPE, ROLLED OVER A HILL, AND COULD NOT BE STOPPED BEFORE COLLIDING WITH TREES. THERE WAS NO BRAKING FRICTION BECAUSE OF WET GRASS. DURING A POST ACCIDENT INSPECTION, A STUCK EXHAUST VALVE WAS FOUND IN THE NUMBER 2 CYLINDER. THE HEAD OF THE VALVE STEM WAS DISCOLORED AND HAD THE APPEARANCE OF A VARNISH-LIKE COATING. MEASUREMENTS OF THE VALVE STEM AND GUIDE SHOWED THAT THE STEM WAS 0.0075 MICROMETERS LARGER THAN THE GUIDE. FOURTEEN MONTHS EARLIER A VALVE HAD STUCK IN THE NUMBER 4 CYLINDER. SINCE THE AVAILABILITY OF THE AUTO FUEL STC, THE ENGINE HAD BEEN OPERATED ABOUT 25%-50% OF ITS HOURS WITH AUTO FUEL. RECENT CYLINDER COMPRESSION CHECKS HAD BEEN WITHIN LIMITS.
Probable Cause: A seized cylinder exhaust valve because of deposits on the valve and an oversized valve stem. The lack of suitable terrain for a forced landing was a factor.
Accident investigation:
 |
|
Sources:
NTSB ATL94LA165
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 15:47 | ASN Update Bot | Added |
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