ASN Wikibase Occurrence # 155643
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| Date: | Saturday 27 April 2013 |
| Time: | 18:00 |
| Type: |  Cessna 172N Skyhawk |
| Owner/operator: | Private |
| Registration: | N5944J |
| MSN: | 17273846 |
| Total airframe hrs: | 2748 hours |
| Engine model: | Lycoming O-320-H2AD |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Dade City, Florida -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Hernando County, FL (BKV) |
| Fort Pierce, FL (FPR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the accident flight, the exhaust gas temperature on the No. 3 cylinder began as the coldest and then transitioned to the hottest. Subsequently, the cylinder head temperature on the No. 3 cylinder also transitioned to the hottest. According to the pilot, the engine then began to run roughly, and he adjusted the throttle and mixture positions to gain control of the malfunctioning engine. During emergency communications with air traffic control, the engine lost all power, and the pilot conducted an emergency landing to a field.
Examination of the engine revealed that the No. 3 cylinder exhaust valve rocker arm stud had backed out of the cylinder, which prevented the exhaust valve from opening properly. Specifically, the loose rocker arm stud prevented the pushrod from depressing the exhaust valve far enough in to release exhaust from the cylinder, which damaged the intake valve pushrod and caused a complete loss of engine power. The No. 3 cylinder had been replaced about 14 months before the accident and had accumulated 480.9 hours since installation. It is likely that the rocker arm and nut assembly became loose over time; the initial torque value could not be determined.
Probable Cause: The in-flight loosening of the No. 3 cylinder exhaust valve rocker arm stud, which resulted in a complete loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Apr-2013 09:21 | afm10 | Added |
| 02-May-2013 05:20 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:32 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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