Introduction
A Piper PA-32R-300 aircraft experienced a loss of power and subsequently landed short of and parallel to the runway. The pilot reported that during climb, turning on the heater caused the windshield to blacken and a pungent odor to emerge. The pilot reduced throttle, and the windshield began to clear.
Sequence of Events
When the pilot advanced the throttle to resume the climb, the engine began to run rough and then would not produce power. The pilot received radar vectors toward an airport. Due to poor visibility, he was unable to judge his position relative to the airport. He prematurely lost altitude by S-turning and subsequently landed short of and parallel to the runway.
Examination Findings
An examination of the aircraft's engine under the supervision of an FAA airworthiness inspector revealed that four spark plugs had been damaged in the area of the electrode. Further examination during a teardown inspection revealed that the muffler had exploded, blocking the air induction system.