Approach and Deviation
During an IFR arrival, the flight was cleared for an ILS Runway 32 Approach. The pilot(s) acknowledged the clearance and initiated the approach. Radio transmissions from the airplane became unreadable as the approach continued. Radar data showed that on final approach, the airplane deviated laterally (S-turned) through the final approach course, as if the pilot was overcorrecting.
Missed Approach and Loss of Radar Contact
At about 400 feet MSL and 1 mile from the runway, the flight deviated to the left and began a non-standard missed approach. An alternate IFR missed approach procedure was issued, and the pilot(s) acknowledged by clicking the microphone button; however, the alternate missed approach instruction was not followed. Radar data showed the airplane flew a southerly course for about 2-1/2 miles, then it began turning, and radar contact was lost.
Witness Observations and Crash
Witnesses saw the airplane descending through fog in a steep, nose-down, right bank attitude before disappearing from view. Engine RPM was heard to increase, then the plane crashed in a boat docking area.
Pilot Information
The left seat pilot had been issued a private pilot certificate based on his German certificate; he held an instrument rating, but did not have a current medical certificate; no record was found of his previous flight time. The right seat pilot held a commercial and ATP certificate (with instrument rating) and was presumed to be the pilot in command; a review of his logbook revealed the last recorded flight in this make and model of airplane was on March 27, 1988.