Casualties unknown

Engine Component Wear Found After Off-Airport Landing (N8597D)

Tok, AK, US

On September 2, 1994, a Piper PA-18 (registration N8597D) operated by 40 Mile Air, Ltd. was involved in an aviation accident near Tok, AK. Investigators recorded the probable cause as: THE WORN CAM SHAFT LOBE AND WORN VALVE LIFTER. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

An aircraft became airborne briefly then settled into brush after reaching the end of a 600-ft strip. Investigation revealed worn cam lobe and follower, and metal particles had been found in the oil screen during a prior inspection.

Incident Description

During takeoff from a 600-foot strip, the pilot selected the second notch of flaps as the airplane reached the end of the runway. The aircraft became airborne for approximately 20 feet before settling into brush. No further details on the location or date of the event were provided.

Passenger Statement

The passenger reported, "My impression is that we lacked or lost adequate power to maintain flight." This statement was documented in the investigation records.

Comparison with Other Aircraft

Another company Piper PA-18 operating at the same site had no difficulty ferrying all personnel from the location, indicating that the accident aircraft's performance differed under similar conditions.

Engine Examination

Post-incident inspection of the engine revealed an exhaust cam lobe worn to 30-40% of its original profile. The associated cam follower was also worn and dish-shaped. The depth of the worn areas exceeded the depth of the nitrated surface, indicating significant metal loss.

Maintenance Findings

According to the Director of Maintenance, a 50-hour inspection had been performed prior to the accident flight. During that inspection, metal particles were found in the oil screen. No further maintenance actions or conclusions were specified in the source.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001206X02160. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.