The pilot stated that he was conducting a skydiver “jump run”, and prior to letting the skydivers out the radio squelch interrupter failed causing a constant static noise. After letting the skydivers out over the airport the pilot set up the descent based on the winds acquired for the previous landing on runway 22. As he circled for landing the manifold pressure indication “dropped off” to zero.
The pilot was landing the twin-engine, turboprop airplane on a 3,000-foot-long, 70-foot-wide, asphalt runway, when he encountered a high sink rate. He applied engine power; however, the engines did not respond quickly enough to prevent a hard landing.