ASN Wikibase Occurrence # 132901
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| Date: | Wednesday 3 August 1994 |
| Time: | 15:25 LT |
| Type: |  Cessna 150J |
| Owner/operator: | Waxhaw Aero Club |
| Registration: | N60182 |
| MSN: | 15070129 |
| Total airframe hrs: | 4470 hours |
| Engine model: | CONTINENTAL O-200-A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Waxhaw, NC -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Training |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE FLIGHT INSTRUCTOR AND HIS STUDENT WERE TAKING OFF ON A LOCAL, INSTRUCTIONAL FLIGHT. ABOUT 300 FEET AGL, DURING THE INITIAL CLIMB, THE ENGINE LOST POWER, ACCOMPANIED BY A STRONG VIBRATION. THE AIRCRAFT WAS FORCE LANDED, AND COLLIDED WITH TREES. A POST- ACCIDENT EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 2 EXHAUST VALVE WAS STUCK OPEN. FURTHER INSPECTION SHOWED COKING AND CARBON DEPOSITS ON THE VALVE STEM AND GUIDE. AFTER CLEANING, THE VALVE STEM DIAMETER WAS MEASURED TO BE .4328'. THE ALLOWABLE RANGE IS .4335' TO .4340'. THE ENGINE HAD A HISTORY OF STICKING VALVES; THE NUMBER TWO EXHAUST VALVE WAS FREED BY MAINTENANCE PERSONNEL 5 HOURS BEFORE THE CRASH. THEY ALSO REPORTED THAT THE VALVE WAS FREED WITHOUT REMOVING THE CYLINDER OR THE VALVE.
Probable Cause: A LOSS OF ENGINE POWER DUE TO A STUCK, AND WORN, EXHAUST VALVE, AND THE INADEQUATE INSPECTION OF THE ENGINE BY OTHER MAINTENANCE PERSONNEL. A FACTOR WAS THE TREES AT THE FORCED LANDING AREA.
Accident investigation:
 |
|
Sources:
NTSB ATL94LA150
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 05:32 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Source, Narrative, Category, Accident report] |
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