On July 23, 1992, a Mooney M20F (registration N6730N) operated by Brown, Carl A. was involved in an aviation accident near Eufaula, AL. Investigators recorded the probable cause as: The fuel injector servo was producing a rich mixture, at the low power setting, as a result of the bushing between the diaphragms sticking. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During a post-maintenance test flight, a pilot experienced engine unresponsiveness on final approach, leading to an emergency landing in rough terrain. Investigation found a stuck bushing in the fuel injector servo caused a rich mixture at low power.
Incident Overview
Following a maintenance test flight, the pilot was on final approach to the runway when he perceived being below the glide path. In an attempt to adjust the descent rate, he added power, but the engine failed to respond. The subsequent emergency landing was initiated in rough terrain near the approach end of the runway.
Aircraft and Pilot Outcome
The aircraft sustained substantial damage during the landing, and the pilot received minor injuries.
Engine Examination
Post-incident examination of the engine determined that the fuel injector servo was producing a rich mixture at the low power setting. This condition resulted from the bushing between the diaphragms sticking.
Investigation Findings
No other factors were identified in the source material. The engine malfunction directly led to the loss of thrust response.
Probable cause
The fuel injector servo was producing a rich mixture, at the low power setting, as a result of the bushing between the diaphragms sticking.