Cessna 402B N300SH accident near Fort Lauderdale, Florida

Probable cause

The improper adjustment of the right main landing gear down lock by maintenance personnel resulting in the gear collapse during the landing roll..

NTSB analysis

The pilot reported that during approach, he observed only two down and locked indications for the nose and left main landing gear. The pilot's attempts to get the right main landing gear down and locked indication were unsuccessful, and a visual inspection of the landing gear by an air traffic controller revealed that the landing gear appeared to be down and locked. During the landing, the right main landing gear collapsed. Examination of the airplane revealed that the right main landing gear down lock micro switch was loose and not fully closed. Review of the operator's records and interviews of the operator's maintenance personnel revealed that several days prior to the accident, they made an improper adjustment to the right "side brace lock link," which was beyond the manufacturer's specifications, and prevented the right main gear to lock in the down position. In addition, after the adjustment, the maintenance personnel did not perform functional checks as required by the manufacturer's instructions.

Text from the NTSB. Open the NTSB docket for MIA08LA079 for the full record.