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Aviation Accident

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NTSB Identification: WPR15LA058
14 CFR Part 91: General Aviation
Accident occurred Wednesday, December 10, 2014 in Sheridan, WY
Probable Cause Approval Date: 12/14/2015
Aircraft: MCHOLLAND GLASTAR, registration: N16XP
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot reported that he had not flown the airplane in “some time.” He added that, on the day of the accident, he performed a full power run-up and that the airplane “felt normal.” The takeoff and climbout were normal; however, while the airplane was at 1,200 ft above ground level, the engine began to lose power. During the attempted forced landing, the main landing gear impacted an irrigation pipe, the left wing tip impacted a fence post, and the airplane then slid about 60 ft before coming to rest upright.
The pilot reported that, after exiting the airplane, he observed a broken wire on the cowl flap cable, which he believed would have allowed the cowl flap to completely close and then resulted in the engine overheating. However, during a postaccident engine examination, it could not be determined if the wire on the cowl flap broke before or during the impact. The examination revealed no other evidence of a mechanical malfunction or failure that would have precluded normal engine operation. 

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
  • A loss of engine power while maneuvering at low altitude for reasons that could not be determined during postaccident examination.