Casualties unknown

Engine Power Loss Forces Forest Landing; Carburetor Heat Control Wire Found Disconnected (N2553S)

Sisters, OR, US

On March 17, 2004, a Piper PA-18 (registration N2553S) was involved in an aviation accident near Sisters, OR. Investigators recorded the probable cause as: The loss of engine power for undetermined reasons. Factors include no suitable place for a forced landing, and trees in the area where the pilot found it necessary to attempt the forced landing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

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

During descent to landing, the engine lost power. Pilot actions failed to restore power, leading to a forced landing onto forested terrain. Post-accident inspection revealed disconnected carburetor heat control wire.

Accident Overview

The pilot was cruising at 7,500 feet while en route and had been in a gradual descent for about 10 minutes toward the intended landing point. During the descent, the engine lost power. The pilot switched fuel tanks, applied carburetor heat for approximately 20 seconds, and moved the throttle in and out. These actions did not restore engine power.

Forced Landing

Unable to restore power, the pilot began searching for a suitable location for a power-off forced landing. No smooth terrain was available in the area. The pilot slowed the aircraft and flew it onto forested terrain in a landing attitude. During the landing sequence, the aircraft collided with several trees.

Post-Accident Inspection

A post-accident examination of the aircraft revealed that the wire from the carburetor heat control was no longer attached to the bolt in the fitting on the carburetor heat box actuation lever. The wire had come out of the hole in the bolt, but the crush washer, castle nut, and cotter pin remained attached to the bolt. Additionally, the carburetor heat control wire housing was found disconnected from its mounting point.

Pilot Statement

According to the pilot, the carburetor heat was tested as part of the pre-takeoff check. At that time, there was a significant drop in RPM when the carburetor heat was actuated.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20040324X00362. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.