Amateur-built ZODIAC CH-650 N914AR accident near Willow Springs, Missouri

Probable cause

Improper maintenance practices on the fuel system causing fuel starvation and a total loss of engine power.

NTSB analysis

According to the pilot of the experimental, amateur-built airplane, he was taking the airplane out for a test flight after making some adjustments to the propeller blade angles. During the initial climb, the engine lost power, restarted on its own and lost power again. The pilot turned back to the airport, but the airplane could not reach the runway and he conducted a forced landing off-field, which resulted in substantial damage to the airplane.

Examination of the airplane by a certified mechanic revealed that the fuel pump was weak on pressure and the electric fuel pump was installed incorrectly between the engine driven pump and the carburetor. The fuel flow meter was installed using pipe fittings connected to flare fittings. All fittings were finger tight. These discrepancies were consistent with improper maintenance practices on the fuel system and likely resulted in a reduction in fuel flow during the initial climb after takeoff, and a loss of engine power due to fuel starvation.

Text from the NTSB. Open the NTSB docket for ERA20LA050 for the full record.