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ASN Wikibase Occurrence # 60120
Last updated: 24 January 2020
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Date:16-MAY-2009
Time:16:30
Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172N
Owner/operator:California Flight Academy
Registration: N738LF
C/n / msn: 17270056
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:40 miles from Blythe, California -   United States of America
Phase: Unknown
Nature:Private
Departure airport:El Cajon, CA (SEE)
Destination airport:El Cajon, CA (SEE)
Investigating agency: NTSB
Narrative:
In cruise flight, the airplane experienced a loss of power to the avionics. While focusing on that situation, the pilot reported a partial loss of engine power and the inability of the airplane to maintain altitude. The pilot elected to make a precautionary landing at a nearby airport. Believing he was in gliding distance of the airport, he shut down the engine. The approach was too high and the airplane overshot the runway. The pilot attempted a turn back to the runway; however, he had to make a sharper-than-normal turn due to wires in his immediate flight path. While performing the tighter turn, the airplane lost further altitude and the pilot had to make a forced landing adjacent to the runway on uneven terrain, coming to rest inverted. During a postaccident examination of the engine it was discovered that the number one cylinder's intake valve had deposits on the valve seat, preventing it from making a tight seal and resulting in the partial loss of engine power. No electrical problems could be identified during the examination.
Probable Cause: A partial loss of engine power due to low compression from an obstructed intake valve. Contributing to the accident was the pilotís decision to shut down the engine while in flight.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20090518X04245&key=1


Revision history:

Date/timeContributorUpdates
18-May-2009 09:01 slowkid Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 14:54 ASN Update Bot Updated [Cn, Operator, Total occupants, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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