Incident Overview
While preparing for a normal landing, the pilot attempted to lower the landing gear. When the landing gear switch was activated, the gear lock indicators did not show the landing gear in the down-and-locked position. Manual extension of the landing gear was also attempted but was unsuccessful.
Emergency Landing
After circling the airport for approximately 20 to 30 minutes, the pilot executed an emergency gear-up landing. The aircraft touched down with the landing gear retracted.
Postaccident Examination
A postaccident examination of the aircraft revealed that the landing gear box had failed. This failure caused the flaps attachment tracks to separate from the spar webbing, and the belly formers were damaged.
Findings
The investigation determined that the landing gear box failure was the reason the landing gear could not be extended. No other contributing factors were identified.