ASN Wikibase Occurrence # 147491
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| Date: | Tuesday 7 August 2012 |
| Time: | 09:45 |
| Type: |  Cessna 177B Cardinal |
| Owner/operator: | Hawkeye Helicopter |
| Registration: | N17201 |
| MSN: | 17702517 |
| Total airframe hrs: | 9212 hours |
| Engine model: | Lycoming O-360-A1F6D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Panola County, 4 miles NE of Carthage, TX -
 United States of America
|
| Phase: | Landing |
| Nature: | Survey |
| Departure airport: | Shreveport, TX (SHV) |
| Shreveport, TX (SHV) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The engine lost partial power without warning during a pipeline patrol flight at 500 feet above ground level. The airplane impacted logs during a forced landing on a logging site. A postaccident examination revealed that the No. 1 cylinder intake valve was not present under its rocker arm tip and that its retainers were worn, deformed, and segmented in the bottom of its rocker box. The tip of the rocker arm was worn consistent with the rocker arm contacting the upper valve stem and its retainer. Inboard of the tip, the rocker arm exhibited a wear mark consistent with contact with the valve spring retainer. Further, the piston exhibited impact marks consistent with valve contact, and the No. 1 intake port exhibited a hole consistent with a liberated valve stem impacting the side of the intake port. It is likely that, when sufficient rocker arm wear occurred, the intake valve was released. The liberated valve was found in pieces in the Nos. 3 and 4 intake tubes. The No. 1 intake valve examination revealed no indications of fatigue in any of the fractures, and the valve face did not exhibit erosion or wear. The intake valve and its guide exhibited no evidence indicating that the valve was stuck. The Nos. 2 through 4 intake valve rocker arms were sectioned, and they met the minimum overhaul hardness specifications, but the depth of the carburized case layer was somewhat shallow consistent with its having been resurfaced during overhaul, which the engine had undergone 878.5 hours before the accident. The wear damage to the failed rocker arm tip precluded the determination of the depth of its carburized layer. However, it is likely that the rocker arm tip’s wear occurred because of the thin carburized case layer.
Probable Cause: The loss of engine power during a low-level aerial observation flight as the result of the wearing of the rocker arm tip due to a thin carburized case layer, which resulted in a forced landing.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: https://www.cbs19.tv/story/19218435/no-injuries-in-small-plane-crash-near-carthage
http://www.kltv.com/story/19217713/faa-to-investigate-tuesday-morning-etx-plane-crash
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=17201
https://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20120807X31724&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Aug-2012 17:16 | Geno | Added |
| 08-Aug-2012 00:05 | Geno | Updated [Time, Operator, Phase, Nature, Source, Damage, Narrative] |
| 08-Aug-2012 00:07 | Geno | Updated [Departure airport] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 13:15 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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