North American NAVION N91173 accident near Tullahoma, Tennessee

Probable cause

A total loss of engine power during takeoff as a result of fuel starvation.

NTSB analysis

The pilot reported that he had experienced an intermittent fuel pressure fluctuation and rough-running engine during a previous flight, but that the condition was not present during a subsequent test flight with a mechanic. Before departing on the accident flight, the pilot visually checked the airplane’s fuel quantity; he reported that the main fuel tank contained about 6 gallons of fuel and the auxiliary tanks contained about 12 to 14 gallons of fuel. The pilot reported switching from the main tank to the auxiliary tank during the initial climb. Shortly thereafter, during the crosswind turn about 300 ft above ground level, the engine abruptly lost power. During the ensuing forced landing, the airplane struck trees and came to rest in a field. Postaccident examination found the fuel selector positioned to the main tank, which was depleted, while about 10 gallons of fuel remained in the auxiliary tanks. Postaccident examination of the engine revealed no anomalies, and the fuel system remained intact with no evidence of leakage. Additionally, a service bulletin issued by the airplane type certificate holder indicated that the auxiliary fuel tank should not be used for takeoff or landing to reduce the possibility of an inadvertent loss of engine power. Based on the available information, it was likely that the loss of engine power was the result of fuel starvation.

Text from the NTSB. Open the NTSB docket for ERA24LA254 for the full record.