Flight and Incident
An instructional flight involving a student pilot and a certified flight instructor (CFI) conducted an instrument landing system (ILS) low approach to runway 30R. During the subsequent go-around (missed approach), a tower controller observed a 'light trace of smoke' emanating from the engine exhaust. Shortly thereafter, the aircraft 'banked hard to the left and appeared to stall.' The aircraft then impacted the ground in approximately a 20-degree nose-down, slightly left-wing-low attitude. Impact occurred about 1,000 feet southeast of the departure end of runway 30R.
Wreckage Examination
The fuselage and inboard wing sections were badly burned. Minimal rotational damage was found on the propeller and propeller spinner. Examination of the wreckage revealed no preimpact part failure or malfunction.
Fuel System Examination
The three-position auxiliary fuel boost pump switch, installed in accordance with Airworthiness Directive 87-08-05 and Beech Service Bulletin 2033, was found in the HI BOOST position. The respective fuel truck had been drained for maintenance before fuel samples could be obtained. Maintenance personnel noted particulate in the fuel, but none was found in the aircraft fuel screens. After minor repairs, the engine started and operated normally. The flight manual prohibits use of HI BOOST except when the engine-driven pump fails as evidenced by zero fuel flow.