Saturday, April 15, 2017

Taylorcraft BC12-D, N43616: Accident occurred August 16, 2015 at Libby Airport (S59), Lincoln County, Montana

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Aviation Accident Factual Report - National Transportation Safety Board:  https://app.ntsb.gov/pdf

Docket And Docket Items - National Transportation Safety Board: https://dms.ntsb.gov/pubdms


The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:

Federal Aviation Administration Flight Standards District Office;  Salt Lake City, Utah

http://registry.faa.gov/N43616

NTSB Identification: WPR15LA246
14 CFR Part 91: General Aviation
Accident occurred Sunday, August 16, 2015 in Libby, MT
Probable Cause Approval Date: 05/23/2017
Aircraft: TAYLORCRAFT BC12 D, registration: N43616
Injuries: 2 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 private pilot of the tailwheel-equipped airplane stated that, during the landing roll, the airplane began to veer to the left. The pilot used both brake and rudder inputs in an effort to return to the runway centerline; however, despite the pilot's attempts to regain directional control, the airplane continued off the left side of the runway and ground looped. Postaccident examination of the left landing gear and braking system revealed no evidence of mechanical malfunction or failure that would have precluded normal operation.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The pilot's failure to maintain directional control during the landing roll, which resulted in a runway excursion.

On August 16, 2015, about 1915 mountain daylight time, a Taylorcraft BC-12D, N43616, experienced a brake system malfunction during the landing roll at the Libby Airport, Libby, Montana. A private individual owned the airplane and the pilot was operating it under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The private pilot and passenger were not injured; the airplane sustained substantial damage. The cross-country personal flight departed from a remote grass airstrip in Yaak, Montana about 1845 with a planned destination of Libby. Visual meteorological conditions prevailed and the pilot had not filed a visual flight rules (VFR) flight plan.

The pilot stated that after completing the approximate 20 minute flight, he configured the airplane to land on runway 33 at the Libby Airport. Upon touchdown, the airplane began to veer to the left. The pilot used both the brake and rudder inputs in an effort to return to the runway center. Despite the pilot's attempts to regain directional control, the airplane continued off the left side of the runway and ground looped. The airplane incurred substantial damage to the wing spar.

The pilot further stated that the loss of directional control was precipitated by a landing gear malfunction. He opined that the left brake likely seized after touchdown, which was evident from the skidmark on the runway surface. The brake system was the original cable-operated drum brake. The left landing gear was locked immediately after the accident, but after several hours was free to turn again. A Federal Aviation Administration (FAA) certified airframe and powerplant mechanic examined and disassembled the left landing gear. He stated the examination of the braking system revealed no evidence of mechanical malfunction or failure that would have precluded normal operation. He further stated that he could smell a burned odor from the brake, but they functioned normally.

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