Accident Details
The crew of an airplane inadvertently landed with the landing gear fully retracted. The crew did not lower the landing gear or verify its position as required by the flaps-up landing checklist, the normal landing checklist, and the final checklist.
Findings
According to the cockpit voice recorder (CVR), the landing gear unsafe warning horn did not sound during the recorded portion of the flight. The minimum equipment list (MEL) required the installation of a placard prohibiting the silencing of the landing gear warning horn when the flap system was inoperative. The accident airplane had such a placard stating, "Do not silence gear warning horn." No anomalies were found with the landing gear system, including the landing gear unsafe warning horn, the red landing gear control handle lighting, and the landing gear position lights. The flap system and ground proximity warning system (GPWS) were inoperative for the accident flight and were listed on the MEL as items that could be inoperative for revenue flight.
Probable Cause
The crew unintentionally landed the airplane with the landing gear in the fully retracted position because they did not lower the landing gear or check its position as required on the applicable checklists.