Incident Overview
The right main landing gear of an airplane collapsed during landing after the pilot diverted to Fort Smith, Arkansas. The pilot was operating under an IFR flight plan from Oklahoma City, Oklahoma, to Little Rock, Arkansas. During the flight, the pilot observed that the oil pressure exceeded the green range and subsequently diverted to Fort Smith.
Landing Gear Extension Issue
When the pilot extended the landing gear, the indicator light did not illuminate. To assess the gear position, the pilot performed a low flyby over the airport, allowing controllers in the control tower to visually inspect the landing gear. The tower controllers confirmed that the gear appeared to be extended but could not determine whether it was locked in position.
Landing and Failure
Upon landing, the right main landing gear collapsed. Post-incident examination of the airplane revealed that the electric pump motor/hydraulic power pack had failed. The component was replaced, and following replacement, the landing gear system operated within manufacturer's specifications.