Incident Details
During the landing roll, approximately 5 to 10 seconds after touchdown, the pilot-in-command reported a landing gear failure accompanied by a gear warning horn. The pilot had previously observed the landing gear indicators showing three green lights before touchdown, indicating that the gear appeared to be down and locked.
Inspection Findings
A subsequent inspection of the landing gear system revealed no mechanical or other deficiencies. The gear was examined thoroughly, but no faults were identified that could explain the reported failure.
System Behavior
Further analysis indicated that an inadvertent movement of the landing gear switch prior to the switch engagement could have caused the landing gear retraction sequence to cycle. However, gear retraction and extension tests performed on the aircraft after the accident failed to disclose any problem with the system.
Conclusion
The investigation did not identify a mechanical cause for the reported gear failure. The possibility of an inadvertent switch movement was noted but not confirmed as the cause of the event.