NTSB Identification: ANC11CA075
14 CFR Part 91: General Aviation
Accident occurred Friday, August 12, 2011 in Kodiak, AK
Probable Cause Approval Date: 02/06/2012
Aircraft: PIPER PA-32-301, registration: N8152Z
Injuries: 2 Uninjured.
NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.
The pilot and the operator's director of maintenance (DOM) were on a postmaintenance check flight. According to the pilot, while approaching to land, the throttle control became inoperative, resulting in a partial loss of engine power. The pilot selected a tidal beach as a forced landing site but was unable to reach it and landed in shallow water short of the site. The airplane sustained substantial damage to the wings and fuselage. The DOM reported that, while troubleshooting a recurring complaint of low engine manifold pressure, he noticed that the castellated nut, which connects the throttle linkage to the fuel control servo, was loose. He said that he removed the cotter pin, tightened the nut, and reinstalled the cotter pin. A postaccident engine examination revealed that a self-locking nut was missing from the throttle linkage arm, resulting in the disconnection of the throttle cable. The DOM said that the missing locknut was not the same one that he tightened but was a nut on the other end of the throttle linkage arm, about 2 inches from the castellated nut that he tightened. The DOM noted that he should have checked the security of the self-locking nut, but he did not. The self-locking nut was not recovered.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: A partial loss of engine power while on approach to land due to a disconnected throttle control linkage, and the maintenance director's inadequate inspection of the throttle linkage during maintenance. Full narrative available
Index for Aug2011 | Index of months