Aircraft and Flight Details
The aircraft involved was an amateur-built RV-7. The builder/owner hired a pilot, who was also a designated airworthiness representative, to inspect the airplane and perform its first test flight.
Preflight Inspection
During the preflight inspection, the pilot did not remove the cowling to inspect the engine compartment. The pilot subsequently completed the test flight and returned to the airport for landing.
Accident Sequence
On final approach, the pilot adjusted the throttle, but the engine did not respond. He could not increase or decrease power. He then extended the flaps and performed a sideslip maneuver, but he was "going too fast and was too high" to land. He turned the airplane to land on another runway. During the turn, the airplane "lost altitude" and impacted the ramp area.
Post-Accident Inspection
An inspection of the airplane following the accident revealed that the throttle control was disconnected from the fuel servo. The throttle linkage connecting bolt and several washers were found loose inside the engine cowling. The corresponding castellated retaining nut and respective cotter key were not located.
Builder Statement
During an interview, the owner/builder stated that he "may have forgotten to install the cotter key."