ASN Wikibase Occurrence # 354559
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| Date: | Saturday 25 April 1998 |
| Time: | 14:30 LT |
| Type: |  Cessna 172N |
| Owner/operator: | Aspen Air Corp. |
| Registration: | N6356D |
| MSN: | 17272742 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 2121 hours |
| Engine model: | Lycoming O-320-H2AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Parker, CO -
 United States of America
|
| Phase: | Approach |
| Nature: | Training |
| Departure airport: | Englewood, CO (APA |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor pilot (CFI) said that after completing a local instructional flight, he and his student entered an extended right base for runway 35R, about 5 miles southeast of the airport. He 'suddenly heard the engine lose a major portion of power.' While performing an emergency check of the instruments, the instructor noted that the engine power had dropped to 1,800 rpm. Realizing they would be unable to glide to the airport due to the loss of engine power, the CFI executed an emergency landing on a field near a golf course. The ground was muddy due to an accumulation of rain and snow from the previous night. After the airplane traveled a short distance, the nose wheel struck a rut, and the airplane nosed over. Examination of the aircraft engine revealed that the #1 (right front) cylinder intake pushrod was bent. After removing the valve cover, a stud that anchored the #1 exhaust valve rocker arm was found to be fractured, and the #1 exhaust valve was in the closed position. There was no damage to the valve lifters or camshaft.
Probable Cause: a fractured #1 exhaust valve rocker arm stud, which subsequently resulted in loss of engine power and a forced landing. The lack of suitable terrain in the forced landing area was a related factor.
Accident investigation:
 |
|
Sources:
NTSB FTW98LA198
History of this aircraft
Other occurrences involving this aircraft
| 6 December 1988 | N6356D | Private | 0 | Englewood, CO | |
sub |
| 27 April 1990 | N6356D | Pc Flyers | 0 | Englewood, CO | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 15:47 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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