While conducting touch-and-go landings and as the private pilot landed the Piper PA-28R for the third time, the right main landing gear and nose landing gear collapsed, and the right wing was partially separated from the airplane.
Post-accident examination of the airplane revealed that maintenance personnel had improperly secured an unused instrument lamp socket during recent maintenance, which allowed an electrical short of the landing gear controls.
The landing gear control circuit breaker tripped, which stopped the landing gear from fully extending while it was transitioning to the down position. It also rendered the landing gear indicators and warnings inoperative so the pilot was unaware the landing gear was not fully extended.
Probable cause: Maintenance personnel’s improper securing of an unused instrument lamp socket during recent maintenance, which resulted in an electrical short of the landing gear controls and stopped the landing gear while it was transitioning to the down position and led to the landing gear collapse.
NTSB Identification: CEN17LA150
This April 2017 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.