ASN Wikibase Occurrence # 167743
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| Date: | Wednesday 2 July 2014 |
| Time: | 08:42 |
| Type: |  Piper PA-28-140 Cherokee |
| Owner/operator: | Iron Compass Aviation |
| Registration: | N9898W |
| MSN: | 28-23418 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 3464 hours |
| Engine model: | Lycoming 0-320-E2A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Granbury Regional Airport (KGDJ), Granbury, TX -
 United States of America
|
| Phase: | Take off |
| Nature: | Training |
| Departure airport: | Granbury, TX (GDJ) |
| Waco, TX (ACT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor reported that, after takeoff, when the airplane was about 500 ft above ground level, the engine started to run roughly and lose power. The engine rpm decreased to about 1,100 rpm as the flight instructor attempted to turn the airplane 180 degrees back toward the airport. However, he was unable to land at the airport, so he made a forced landing to a field short of the runway.
During a postaccident engine test run, the engine initially ran roughly, and black smoke was observed coming from the exhaust. After a brief warmup, the engine could only produce about 1,600 rpm at full throttle, and the engine test run was stopped. The examination of the No. 3 cylinder revealed that the exhaust valve was broken in several pieces and that some fragments remained in the cylinder, which produced gouging and scraping to the piston and cylinder head. The broken exhaust valve, spring, exhaust valve keepers, and rotating cap exhibited carbon buildup. Examination revealed a wear pattern on the top of the No. 3 cylinder exhaust valve rotator cap consistent with rocker arm wear. No rotational signatures were observed along the edge of the cap near the heavy carbon buildup, indicating that the rotator cap had stopped rotating, which subsequently led to a hot spot on the exhaust valve and caused the valve to fail.
Probable Cause: The partial loss of engine power due to the failure of the exhaust valve.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Jul-2014 02:16 | Geno | Added |
| 03-Jul-2014 22:25 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Phase, Destination airport, Source] |
| 08-Jul-2014 05:43 | Geno | Updated [Time, Destination airport, Source, Narrative] |
| 08-Jul-2014 06:39 | MArnold | Updated [Operator] |
| 22-Jul-2014 04:26 | Geno | Updated [Time, Phase, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 30-Nov-2017 18:50 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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