Event Summary
The pilot attempted an ILS approach with an inbound course of 331 degrees magnetic. The minimum glideslope crossing altitude at the initial approach fix (IAF) was 4,484 feet msl. Radar data indicated the airplane tracked inbound on headings varying from 360 degrees to 270 degrees. Approximately 6.7 miles from the IAF, the airplane descended from 4,600 feet to 3,400 feet at a rate of 850 feet per minute. The last radar hit was recorded at 3,400 feet, about 4.7 miles from the IAF. The wreckage was located approximately 11 miles from the end of the runway at an elevation of 2,461 feet, roughly 300 feet below the peak of a ridgeline.
Flight Path and Radar Data
The radar track showed significant heading variability, ranging from 360 to 270 degrees during the approach. The descent from 4,600 to 3,400 feet began well before reaching the IAF and exceeded the normal glideslope profile. The final radar contact placed the aircraft 4.7 miles from the IAF at 3,400 feet, indicating a continued descent toward terrain.
Wreckage and Examination
The airplane was found about 11 miles from the runway end at an elevation of 2,461 feet, 300 feet below the ridgeline peak. A thorough examination revealed no mechanical deficiencies with the airframe, engine, or systems.
Toxicology and Medical History
Toxicology tests of the pilot detected 6.51 ug/ml (ug/g) of Desipramine in his blood, and both Desipramine and Imipramine in his urine. Imipramine is a prescription antidepressant known to cause sedation and psychomotor impairment in healthy adults. Desipramine, a metabolite of Imipramine, is also a prescription antidepressant. The level of Desipramine found was more than 20 times the expected level for chronic use of a typical dose. Nonfatal overdose effects of Desipramine at lower amounts have included seizures, coma, low blood pressure, and electrocardiographic abnormalities. The pilot's wife, a doctor, reported she had prescribed Desipramine to the pilot for approximately 10 years to treat depression. However, a review of the pilot's FAA medical file revealed he never reported taking Desipramine or having any history of mental disorders.