Date & Time:
Jun 24, 1994 at 0905 LT
Type of aircraft:
Piper PA-31-310 Navajo
Operator:
Roscoe M. Thorne
Registration:
N27872
Flight Phase:
Takeoff (climb)
Flight Type:
Private
Survivors:
No
Schedule:
Palm Beach - Palm Beach
MSN:
31-7912031
YOM:
1979
Country:
United States of America
Region:
North America
Crew on board:
1
Crew fatalities:
1
Pax on board:
1
Pax fatalities:
1
Other fatalities:
0
Total fatalities:
2
Captain / Total hours on type:
3
Circumstances:
The airplane was observed to rotate about 3,217 feet down the 3,746-feet runway. One or both engines were heard running rough. The airplane climbed to about 300 feet agl, banked left, pitched nose down and impacted the ground. During the investigation, the left engine operated to full rated rpm after replacement of the damaged ignition harness, adjustment of the turbocharger density controller, and adjustment of the magneto-to-engine timing. The right engine also operated normally after replacement of the magneto, ignition harness, and engine-driven fuel pump. The density controller required adjustment to obtain full rated rpm. The #3 cylinder fuel injector nozzle was also partially blocked by contaminant. The right engine magneto contact assemblies operationally checked ok. The capacitors were heat damaged. Right engine magneto-to-engine timing and internal timing of the magneto were not determined. Pilot's toxicological results were positive for butalbital (1.768 ug/ml blood, 0.553 ug/ml urine), and also positive for acetaminophen and salicylate (aspirin) in urine. Butalbital is a prescription medication (barbiturate) not approved for flying. Both occupants were killed.
Probable cause:
The pilot's impairment of judgment and performance due to drugs, his failure to abort the takeoff after experiencing reduced takeoff performance, and his failure to maintain minimum control speed. Factors in the accident were: a partial loss of engine power due to improper magneto-to-engine timing, and a partially blocked fuel nozzle.
Final Report:
N27872.pdf107.11 KB
