ASN Wikibase Occurrence # 180560
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| Date: | Sunday 18 October 2015 |
| Time: | 07:45 |
| Type: |  Beechcraft 23 Musketeer |
| Owner/operator: | Old School Aircraft LLC |
| Registration: | N2339J |
| MSN: | M-285 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 3096 hours |
| Engine model: | Lycoming O-320 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | NE of Humbolt Municipal Airport (M53), Humbolt, TN -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Humboldt, TN (M53) |
| Humboldt, TN (M53) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The student pilot and flight instructor reported that ground operations were normal. During the initial climb, when the airplane was about 950 ft above ground level, the engine lost partial power. Unable to return to the departure airport, the flight instructor performed a forced landing in a field. During the landing roll, the nose gear collapsed, which resulted in substantial damage to the airframe.
A postaccident examination of the engine revealed that the No. 2 cylinder only produced minimal compression and that the intake valve would not seat fully due to carbon deposits. The No. 2 cylinder exhaust pipe flange was separated from the cylinder exhaust seat face by about 0.25 inch on the outer left side, and the stud was missing the nut and both washers. One of the spark plugs had lead deposits and produced a weak spark when tested. Also, the right magneto was inoperative; the permanent magnet breaker end bearing had failed, and six teeth were missing from the large distributor timing gear. The partial loss of engine power was likely the result of both the low No. 2 cylinder compression and an inoperative right magneto.
Probable Cause: A partial loss of engine power due to low No. 2 cylinder compression and an inoperative right magneto.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N2339J
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Oct-2015 21:07 | Geno | Added |
| 20-Oct-2015 21:08 | Geno | Updated [Source] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 15-Aug-2020 16:00 | ASN Update Bot | Updated [Operator, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
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