Incident Overview
A pilot reported that during a skydiver jump run, the radio squelch interrupter failed, producing constant static noise. After releasing skydivers over the airport, the pilot set up a descent based on winds from the previous landing on runway 22. While circling for landing, the manifold pressure indication dropped to zero. The pilot was uncertain whether the engine had experienced a partial power loss or if the gauge had failed.
Approach and Landing
Unable to hear or feel engine indications due to the static noise and descent profile, the pilot committed to a power-off glide path for the approach. The airplane's approach speed was approximately 100 knots prior to the threshold. The airplane touched down beyond the threshold, and when the pilot applied full braking, the airplane "ballooned" back into the air. The pilot attempted to stop but was unsuccessful. The airplane exited the runway and came to rest after colliding with a ditch.
Post-Incident Examination
An examination of the airplane revealed that the empennage and firewall were buckled during the landing sequence. The airplane was equipped with a JPI engine monitor, and review of the data did not indicate a loss of engine power during the flight. The wind reported from a nearby weather station indicated winds from 010 degrees at 6 knots at the time of the incident.