Incident Overview
A pilot conducting local flight operations experienced an engine malfunction during a landing practice session. The pilot intended to perform several landings, a dam tour, and return to the departure airport.
Preflight and Initial Operations
Before departure, the pilot reported approximately 22 gallons of fuel in each wing tank. The first takeoff and landing circuit were completed without incident. Following the first landing, the pilot received clearance for an immediate takeoff to begin a second circuit.
Second Circuit and Engine Failure
The second takeoff and initial climb were normal. During the downwind leg, prior to turning base, the engine began running rough. As the pilot reduced throttle, the engine ceased operation entirely.
Fuel Pump Procedure
In a post-incident interview with an FAA inspector, the pilot stated that he routinely activated the auxiliary fuel pump for takeoff and turned it off after reaching pattern altitude. He believed he had turned the pump off after the second takeoff but was not certain. According to the airplane flight manual, the fuel pump should be turned off for takeoff.
Post-Incident Inspection
After the incident, an engine test run was performed. Before the test, the spark plugs were removed and found to be fuel-sooted.
Analysis of Available Information
The engine roughness and subsequent power loss occurred after the second takeoff, with the fuel pump being a point of consideration. The pilot's uncertainty about whether he deactivated the pump as per the manual, combined with the fuel-sooted spark plugs, provided relevant factual details for the investigation.
The source material does not specify a probable cause for the engine failure.