ASN Wikibase Occurrence # 356886
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| Date: | Friday 9 August 1996 |
| Time: | 08:00 LT |
| Type: |  Piper PA-28-180 |
| Owner/operator: | Private |
| Registration: | N2559R |
| MSN: | 28-5648 |
| Year of manufacture: | 1969 |
| Total airframe hrs: | 3504 hours |
| Engine model: | Lycoming O-360-A4A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Midlothian, TX -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | |
| Angel Fire, NM (KAXX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during the takeoff initial climb, there was an engine vibration and a partial loss of power. A forced landing was made in a soft field, and structural damage occurred to the landing gear, propeller, firewall, engine mounts, and the left wing. During an engine test run at full power, FAA inspectors observed an engine power drop of 200 RPM; however, they were not able to duplicate the engine vibrations. Magneto timing was at 27 degrees BTDC, and a carbon brush was missing from the right magneto. The specification for timing was 25 degrees BTDC. The rocker arms had been installed in reverse positions on all four cylinders, and the FAA inspector reported that 'the exhaust valve was not receiving adequate lubrication.' Physical evidence on the exhaust valve rotator caps indicated binding of the exhaust valves. Time in service since a major engine overhaul and magneto overhaul was 170 hours. The pilot reported that before this accident 'there had not been any previous indications of engine problems since the engine overhaul.'
Probable Cause: maintenance personnel's improper engine overhaul procedures resulting in the installation of the rocker arms in reversed positions, which led to improper lubrication and binding of the exhaust valves. A related factor was the lack of suitable terrain for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB FTW96LA343
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 11:54 | ASN Update Bot | Added |
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