ASN Wikibase Occurrence # 352762
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| Date: | Saturday 21 August 1999 |
| Time: | 16:30 LT |
| Type: |  Bellanca 7ECA |
| Owner/operator: | Attitude Aviation |
| Registration: | N88408 |
| MSN: | 1062-75 |
| Year of manufacture: | 1974 |
| Engine model: | Lycoming O-235-C1 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Livermore, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Training |
| Departure airport: | (KLVK) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the takeoff initial climb a partial loss of power was experienced, with the rpm's decreasing to 1,500 accompanied by roughness. The CFI took the controls from the student, made a 180-degree turn back to the runway, and landed hard on a taxiway. Both pilots indicated that there were no discrepancies noted with the preflight, engine start, taxi, or run-up. During the engine examination the number 3 exhaust valve was found broken, and the head found embedded in the piston. A review of the engine logbook revealed that the engine had accumulated 3,711.0 hours since the last major overhaul, which took place on November 30, 1993. According to the engine manufacturer, 2,400 hours or 12 calendar years is the maximum recommended time between overhaul. A Lycoming Mandatory Service Bulletin addresses the need to inspect exhaust valves and valve guides to prevent sticking and possible failure due to excessive guide wear. The bulletin recommends an inspection at 400-hour intervals. No record was found in the logbooks of compliance with the bulletin.
Probable Cause: The failure of the no. 3 cylinder exhaust valve due to the operator's failure to adhere to recommended overhaul periods set by the engine manufacturer. A factor in the accident was the operator's failure to comply with the manufacturer's mandatory service bulletin.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA279
History of this aircraft
Other occurrences involving this aircraft
| 10 November 2002 | N88408 | Attitude Aviation | 0 | Livermore, California | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Mar-2024 17:50 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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