Piper PA-18-150 N44RT accident near Paxson, Alaska

Probable cause

The partial loss of engine power due to a loose throttle cable clamp.

NTSB analysis

The private pilot reported that she was on a cross-country flight in a float-equipped airplane, and that, about 20 minutes into the flight, the engine rpm suddenly dropped to idle. She moved the throttle forward, and the engine momentarily responded, but it again dropped to idle power. She switched fuel tanks, but the engine still did not respond, so she initiated a forced landing to brush-covered tundra. During the forced landing, the airplane nosed over, which caused substantial damage to the wings, fuselage, and empennage.

Examination of the engine revealed that the clamp that secures the throttle cable was loose, which allowed the throttle cable housing to move inside the clamp. The engine was started without tightening the throttle cable clamp, and it operated normally through various power settings. Given the loose throttle cable clamp and the pilot's account of the accident sequence, it is likely that the throttle cable housing was free to move when the throttle lever moved, which limited the amount of throttle authority available to the pilot.

Text from the NTSB. Open the NTSB docket for ANC13LA079 for the full record.