Incident Overview
During a flight, both generator lights and the left and right fuel pressure lights illuminated on the annunciator panel. The crew decided to return to the airport for a precautionary landing. While approaching the airport, the annunciator panel lights began to flicker.
Sequence of Events
When the crew selected landing flaps, the flaps did not operate. The landing gear was lowered, and three green indicators confirmed gear down; however, the nose gear did not fully extend. During the landing rollout, directional control was lost, and the aircraft veered to the left of the runway.
Aircraft Differences
The flight was the captain's first in the A-model aircraft, having previously flown the C-model. In the A-model, the positions of the auto ignition and engine start generator switches are reversed compared to the C-model configuration.
Probable Cause
Investigators determined that it is probable that the captain had selected the engine start switch, which operates on battery power, instead of the auto ignition switch. This selection caused the loss of both generators, leading to the electrical anomalies and subsequent malfunctions.