Pilot Debrief

GRUMMAN AMERICAN AVN. CORP. AA-1B near Creswell, OR — 2009-09-12

Final reportWPR09LA446
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Date
2009-09-12
Location
Creswell, OR, USA
Airport
77S
Aircraft
GRUMMAN AMERICAN AVN. CORP. AA-1B
Registration
N9682L
Category
Airplane
Highest injury
Minor
Fatalities
0
Phase of flight
Initial climb

Probable cause

A partial loss of engine power due to the malfunction of the engine's right magneto.

NTSB narrative

Just after takeoff, the airplane's engine experienced a partial power loss, so the pilot elected to make an emergency landing on rough terrain when it appeared that he would not clear trees in his path. During the pilot's attempts to stop, the airplane nosed over onto its back. A post-accident inspection determined that the engine's right magneto had malfunctioned due to the resistance of the secondary coil windings being out of serviceable limits.

Analysis

Primary failure mode
Engine power loss
First missed decision gate
Pilot could have grounded the aircraft due to known magneto issues before the flight.

NTSB coding

Evidence available

  • 3 docket documents
View NTSB final reportView NTSB docket

Docket documents3

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