Pilot Debrief

CESSNA 150H near Washougal, WA — 2009-07-24

Final reportWPR09LA364
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Date
2009-07-24
Location
Washougal, WA, USA
Airport
4WA1
Aircraft
CESSNA 150H
Registration
N22278
Category
Airplane
Highest injury
Serious
Fatalities
0
Phase of flight
Initial climb

Probable cause

A loss of engine power during initial climb due to a stuck exhaust valve.

NTSB narrative

The pilot reported that the airplane’s engine lost power immediately after takeoff from a private airfield. The left wing then struck a large tree and the airplane subsequently crashed into wooded terrain, which resulted in structural damage to both wings and fuselage. Post accident examination of the engine disclosed that the (top) electrode areas of the spark plugs were oil soaked, and severe wear was noted to the ground and center electrodes. Further examination revealed that the number 4 cylinder exhaust valve was stuck in the open position. The valve remained stuck during a functional check and was later removed utilizing a punch and heavy hammer. A dark brown material and smearing was noted along the exhaust valve neck. Comparable material and smearing was observed along the interior surface of the exhaust valve guide. No additional mechanical anomalies were noted with the engine.

Analysis

Primary failure mode
Engine power loss
First missed decision gate
Pilot could have aborted takeoff upon engine power loss.

NTSB coding

Evidence available

  • Photos
  • 12 docket documents
View NTSB final reportView NTSB docket

Docket documents12

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