On September 19, 1987, a Cessna 140 (registration N77126) was involved in an aviation accident near Jesup, GA. Investigators recorded the probable cause as: Loss of engine power during takeoff due to a carburetor inlet filter blocked by rusty material and the presence of water in the carburetor bowl, associated with the use of automobile fuel authorized by an STC. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft lost power during initial takeoff and crashed into the ground. Investigation found a carburetor inlet filter blocked by rusty material and water in the bowl.
What happened
During the initial phase of takeoff, the aircraft experienced a sudden loss of engine power. Unable to maintain altitude or continue the climb, the aircraft descended rapidly and collided with the ground.
The investigation
Examination of the aircraft revealed significant contamination within the fuel system. Specifically, the carburetor inlet filter was found to be 50 percent plugged with rusty material. Additionally, investigators discovered two tablespoons of rusty water remaining in the carburetor bowl. The aircraft held a Supplemental Type Certificate (STC) authorizing the use of automobile fuel, which may have contributed to the corrosion and contamination issues.
Findings
The primary mechanical failure was caused by restricted fuel flow due to the clogged filter and the presence of water in the carburetor. The use of automobile fuel under the STC likely facilitated the accumulation of rust and water within the system.
Probable cause
Loss of engine power during takeoff due to a carburetor inlet filter blocked by rusty material and the presence of water in the carburetor bowl, associated with the use of automobile fuel authorized by an STC.