NTSB Identification: ANC03LA040.
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Accident occurred Monday, March 31, 2003 in PORT ALSWORTH, AK
Probable Cause Approval Date: 11/25/2003
Aircraft: Piper PA-18, registration: N8106Y
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 commercial certificated pilot was landing at a remote gravel airstrip. During final approach to the gravel bar/airstrip, the pilot said the airplane encountered a minor downdraft, and as he began to add engine power to arrest the resulting descent, the engine did not respond with any increase in power. He said he pumped the throttle without any response. The airplane continued to descend and touched down in an area of low brush, about 50 yards short of the airstrip. During the touchdown, the right main landing gear collapsed and the right wingtip struck the ground. The pilot, who holds an aircraft mechanic certificate, reported that the engine was overhauled and reinstalled on the airplane three days before the accident. At that time, he installed an overhauled carburetor. He indicated that during attempts to run the engine, after the accident, the engine would start and run at idle power. He noticed a binding of the carburetor's throttle cable or internal carburetor linkage. He replaced the throttle cable, but still felt a binding in the throttle mechanism. The pilot said he disconnected the throttle cable from the carburetor, and hand operated the throttle arm. It had binding only when the engine was running. The NTSB IIC conducted an examination of the carburetor at an aviation maintenance facility. No mechanical malfunctions were discovered during the examination.

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

A loss of engine power for an undetermined reason. A contributing factor in the accident was the lack of suitable terrain for a forced landing.

Full narrative available

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