Flight Details
The pilot elected to remain in the traffic pattern to conduct a series of touch-and-go landings. On the third landing attempt, the controller informed the pilot that he would call the pilot's base turn due to other departing traffic.
The Incident
After clearance was given to land on runway 21R, the pilot turned final, set the flaps to full, and forgot to extend the landing gear. The pilot stated that he did not hear the aural gear warning horn sound. Additionally, the pilot noted that a recently installed portable GPS receiver, mounted to the aircraft's control column, blocked the area where the green gear-down indicator lights are located.
Pilot's Account
The pilot reported that the portable GPS receiver obstructed the view of the gear-down indicator lights. He also stated that he had not heard the aural warning horn during the approach. The sequence of events began with the pilot's decision to perform multiple touch-and-go landings, followed by the controller's instruction regarding the base turn. Upon receiving landing clearance, the pilot configured the aircraft for landing but omitted the gear extension step.