ASN Wikibase Occurrence # 245625
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| Date: | Sunday 13 December 2020 |
| Time: | 12:50 LT |
| Type: |  Cessna 172N Skyhawk |
| Owner/operator: | Plus One Flyers |
| Registration: | N5098E |
| MSN: | 17271711 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 6653 hours |
| Engine model: | Lycoming O-320-H2AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Montgomery-Gibbs Executive Airport (MYF/KMYF), San Diego, CA -
 United States of America
|
| Phase: | Take off |
| Nature: | Training |
| Departure airport: | San Diego-Montgomery-Gibbs Executive Airport, CA (MYF/KMYF) |
| San Diego-Montgomery-Gibbs Executive Airport, CA (MYF/KMYF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the flight instructor, the purpose of the flight was for the student pilot to practice touch-and-go landings. During the second takeoff, as the airplane was about 100-150 ft above ground level, he detected a loss of engine power and assumed control of the airplane. He landed the airplane on the remaining runway but overran the departure end of the runway and struck the airport perimeter fence. Both wings sustained substantial damage.
Examination of the engine revealed that the No. 3 exhaust rocker arm stud was fractured. Metallurgical examination of the fracture surfaces on the rocker arm stud revealed that it had fractured due to fatigue. The fatigue fracture of the No. 3 exhaust valve rocker arm stud likely led to the partial loss of engine power.
Probable Cause: A partial loss of engine power due to the fatigue fracture of the No. 3 exhaust valve rocker arm stud.
Accident investigation:
 |
|
Sources:
NTSB WPR21LA069
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Dec-2020 23:01 | Geno | Added |
| 14-Dec-2020 14:39 | Fholbert | Updated [Registration, Source] |
| 14-Dec-2020 14:54 | RobertMB | Updated [Aircraft type, Registration, Cn, Operator, Nature, Source, Narrative] |
| 07-Jul-2022 19:05 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
| 07-Jul-2022 19:07 | harro | Updated [Departure airport, Destination airport, Narrative] |
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