Pilot Debrief

BOEING A75N1(PT17) near Junction City, KS — 2011-06-04

Final reportCEN11LA375
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Date
2011-06-04
Location
Junction City, KS, USA
Aircraft
BOEING A75N1(PT17)
Registration
N50052
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Takeoff roll

Probable cause

The degraded engine performance due to low compression on the cylinder and delayed ignition timing.

NTSB narrative

According to the pilot, during the initial climb after takeoff, the engine started losing power. The pilot believed the airplane was too far down the runway to abort the takeoff, so he continued the climb. Shortly after, the airplane impacted a tree and a house resulting in substantial damage to both wings. A postaccident examination of the engine revealed that the No. 6 cylinder had measured compression of 34/80 and that the ignition timing on the forward and aft bank of spark plugs was delayed resulting in a degradation of engine power. The airplane was loaded to within 150 pounds of the airplane's gross weight, and calculations of relevant meteorological data revealed that the density altitude was 3,350 feet.

Analysis

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

NTSB coding

Evidence available

  • 1 docket document
View NTSB final reportView NTSB docket

Docket documents1

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