What happened
The flight crew encountered a critical mechanical failure during the approach phase at Washington National Airport when the right main landing gear refused to extend for touchdown. Recognizing the imminent danger of a belly landing, the pilots initiated a go-around and attempted to troubleshoot the issue in the air. Despite their efforts to cycle the gear and resolve the malfunction, the system remained unresponsive.
With the situation unresolved, the crew diverted to Dulles International Airport. Upon arrival, they executed an emergency gear-up landing on the runway. Following the stop, the crew and all passengers evacuated the aircraft safely. No injuries were reported among those aboard during the evacuation process.
The investigation
Post-accident examination of the aircraft revealed the specific mechanical failure responsible for the incident. Investigators found that the right downlock link bearing had corroded and seized completely. This component, identified as Boeing part number BACB10B107J, is critical for securing the landing gear in the extended position.
The investigation highlighted significant maintenance challenges associated with this part. There was no external provision available for the lubrication of this specific bearing. Furthermore, there was no requirement for disassembly to inspect or lubricate the component during standard maintenance intervals. Routine inspections were conducted at 'A' checks every 130 flight hours and 'C' checks every 36 days. The most recent inspection prior to the accident was an 'A' check performed on October 28, 1985.