On March 30, 1990, a Cessna P210N (registration N732CG) was involved in an aviation accident near LA Verne, CA. Investigators recorded the probable cause as: THE PILOT'S IMPROPER USE OF POWEROLANT CONTROLS WHICH RESULTED IN AN EXCESSIVE RICH MIXTURE AND POWER LOSS. IN ADDITION, THE PILOT FAILED TO MAINTAIN ADEQUATE AIRSPEED DURING THE FORCED LANDING. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During a go-around after a steep final approach, an airplane experienced black smoke from the exhaust, power loss, and stalled at 50 ft AGL. Examination revealed spark plug carbon sooting, and throttle and mixture controls were full open and full rich, consistent with an enriched mixture from auxiliary fuel pump use.
Accident Sequence
An airplane was observed on a steep, fast final approach when the pilot announced a go-around. During the go-around, black smoke was seen emanating from the engine exhaust system. A reduction in engine power was heard, followed by a total loss of power. While maneuvering toward an open field, the airplane stalled approximately 50 feet above ground level.
Post-Accident Examination
Examination of the spark plugs revealed carbon sooting, indicative of a rich fuel-air mixture. The throttle and mixture controls were found in the full open and full rich positions, respectively. The pilot operating handbook notes that using the auxiliary fuel pump with the throttle fully open and without leaning the mixture results in an enriched mixture.
Frequently asked questions
What happened in the 30 Mar 1990 Cessna P210N accident near LA Verne, CA?
During a go-around after a steep final approach, an airplane experienced black smoke from the exhaust, power loss, and stalled at 50 ft AGL. Examination revealed spark plug carbon sooting, and throttle and mixture controls were full open and full rich, consistent with an enriched mixture from auxiliary fuel pump use.
What aircraft was involved and where did it happen?
The accident on 30 Mar 1990 involved a Cessna P210N, registration N732CG, at LA Verne, CA.
What was the probable cause of the accident?
THE PILOT'S IMPROPER USE OF POWEROLANT CONTROLS WHICH RESULTED IN AN EXCESSIVE RICH MIXTURE AND POWER LOSS. IN ADDITION, THE PILOT FAILED TO MAINTAIN ADEQUATE AIRSPEED DURING THE FORCED LANDING.