On September 3, 1989, a Piper PA-24-250 (registration N4CD) was involved in an aviation accident near Perry, FL. Investigators recorded the probable cause as: FUEL STARVATION DUE TO WEAR AND RESTRICTED MOVEMENT OF THE CARBURETOR FLOAT, WHICH RESULTED IN LOSS OF ENGINE POWER. SOFT TERRAIN IN THE EMERGENCY LANDING AREA CONTRIBUTED TO OVERLOAD FAILURE OF THE NOSE GEAR. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced an engine power loss while cruising at 3,500 feet. The pilot executed a forced landing in a plowed field, where the nose gear collapsed, resulting in damage. Investigation revealed carburetor malfunctions due to float shaft bracket wear.
Event Description
While en route at 3,500 feet, the engine lost power and attempts to restart it were unsuccessful. The pilot landed the aircraft in a plowed field, but during the landing the nose gear collapsed and the aircraft was damaged.
Investigation Findings
During the investigation, the carburetor was removed. Internal examination revealed that the float-to-bowl clearance was less than required due to wear on the float shaft bracket. Excessive float drop, measuring between 1.58 and 1.8 inches, was required to initiate needle valve opening and allow fuel to enter the chamber. Additionally, the float chafed against the carburetor bowl wall before the needle valve opened. No other mechanical problems were found.
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