On May 5, 2001, a Maule M-7-235B (registration N744LS) was involved in an aviation accident near Lake City, MI. Investigators recorded the probable cause as: The hydraulic line to the left landing gear was not properly flared at the fitting, causing a loss of hydraulic fluid and subsequent gear extension during the water landing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An airplane nosed over during a water landing after the landing gear extended on touchdown. The pilot had attempted to retract the gear due to a hydraulic leak caused by an improperly flared line.
Accident Details
The airplane nosed over during a water landing with the wheel extended. The accident occurred after the pilot experienced difficulty with the landing gear system.
Pilot's Account
The pilot reported that after takeoff from the lake, he was unable to lower the landing gear in preparation for a hard surface landing. He returned to the lake, where he recycled the gear and performed emergency procedures to verify the gear was retracted. The pilot stated that he believed the gear was retracted prior to touchdown. However, as he slowed the airplane, the force of the water pulled the landing gear down, and the airplane nosed over.
Post-Accident Inspection
Inspection of the airplane after the accident revealed that the hydraulic line to the left landing gear had separated, porting the hydraulic fluid. It was determined that the hydraulic line was not properly flared at the fitting, leading to loss of fluid and eventual gear extension.
Probable cause
The hydraulic line to the left landing gear was not properly flared at the fitting, causing a loss of hydraulic fluid and subsequent gear extension during the water landing.