ASN Wikibase Occurrence # 291931
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| Date: | Thursday 10 August 2006 |
| Time: | 07:30 LT |
| Type: |  Piper PA-24-260 |
| Owner/operator: | Private |
| Registration: | N8741P |
| MSN: | 24-4192 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 3358 hours |
| Engine model: | Lycoming IO540D4A5 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Harrisburg, Nebraska -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Garden City Municipal Airport, KS (GCK/KGCK) |
| Billings-Logan International Airport, MT (BIL/KBIL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight at an altitude of approximately 8,500 feet, the pilot heard a "loud bang," and the engine oil pressure decreased. Shortly thereafter, engine oil was noted on the windscreen, and the engine lost power. Subsequently, the pilot initiated a forced landing to a field. During the forced landing, the airplane impacted terrain and the nose and right main landing gears collapsed. Examination of the airplane revealed the right wing was buckled. A review of the maintenance records revealed that most recent annual inspection was completed on November 11, 2005, at a total airframe time of 3,358 hours. The engine had accumulated 257 hours since major overhaul and 49 hours since the annual inspection. No additional maintenance besides an oil change was performed on the engine since the November 11th inspection. Examination and disassembly of the engine revealed that connecting rods had been fractured and separated. The pistons were found separated from the connecting rods. The six pistons displayed cracks and fractures along the piston pin bosses, and mechanical damage was noted on the bottom side of the piston. The pistons were retained for further examination by the NTSB materials laboratory. The connecting rod and main bearings displayed evidence of discoloration and heat signatures. The crankshaft counterweights were separated from the crankshaft. Metallurgical examination of two pistons revealed that fractures along the boss for the piston pin were consistent with overstress separation in a casting.
Probable Cause: The loss of engine power resulting from mechanical failure of a connecting rod for undetermined reasons. A contributing factor was the lack of suitable terrain for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB DEN06LA112
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 06:54 | ASN Update Bot | Added |
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