NTSB Identification: ANC99LA137.
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Accident occurred Wednesday, September 08, 1999 in CHUGIAK, AK
Probable Cause Approval Date: 11/22/2000
Aircraft: Stinson 108-2, registration: N97978
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 first pilot, a certificated flight instructor, was providing tailwheel transition flight instruction to the second pilot, a certificated private pilot. The first pilot said that eight successful stop and go landings had been accomplished prior to the accident landing. He said that while landing on runway 19 and during the landing roll, the second pilot applied the brakes. The airplane subsequently ground looped to the right, and the left wing struck the ground, resulting in substantial damage to the left wing. The first pilot said that brake pedals were only installed at the left side pilot position. After the accident, the second pilot related to the first pilot that during brake application, the left brake pedal 'felt mushy' and was less effective than the right brake. An FAA airworthiness inspector examined the airplane at the accident airport, and reported signs of brake fluid leaking from the left brake assembly. He added that disassembly of the left brake assembly revealed 'severely weathered and worn seals.'

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

A partial failure of the brake system. A factor associated with the accident was a leaking brake system.

Full narrative available

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