NTSB Identification: SEA91FA156 For details, refer to NTSB microfiche number 43934A
Accident occurred JUL-05-91 at BURNS, OR
Aircraft: CHAMPION 7AC, registration: N3006E
Injuries: 2 Fatal.
THE STUDENT PLT WAS THE OWNER/OPERATOR OF THE ACFT. HE AND THE PASSENGER WERE ON A
PLEASURE FLT IN AN AREA OF MOUNTAINOUS TERRAIN. THE ACFT WAS SEEN TO TURN INTO A VALLEY
WHERE IT SUBSEQUENTLY COLLIDED WITH THE GROUND AT AN ELEVATION OF ABOUT 5500 FT. DURING
IMPACT, THE WINGS WERE BENT DOWN AND FORWARD; THERE WAS A 45 DEG CRUSH LINE ON THE LEADING
EDGES OF THE WINGS. NO GROUND SCARS WERE FOUND TO INDICATE MOVEMENT AFTER GROUND IMPACT.
THE ACFT'S LAST ANNUAL INSPN WAS DATED 7/22/87; HOWEVER, THE STUDENT PLT CONTINUED TO
OPERATE THE ACFT; HE PERFORMED OIL CHANGES HIMSELF. NO PREIMPACT MECHANICAL FAILURE OR
MALFUNCTION OF THE ENGINE WAS FOUND. THE STUDENT'S LAST MEDICAL EXAM WAS DATED 11/25/87. A
TOXICOLOGY EXAM OF THE STUDENT PLT'S BLOOD SHOWED A SATURATION OF 20% CARBOXYHEMOGLOBIN. A
FLT SURGEON REPORTED THAT THIS PERCENTAGE COULD CAUSE A HEADACHE, A STATE OF CONFUSION,
DIZZINESS AND VISUAL DISTURBANCE. THE INVESTIGATION DID NOT DETERMINE IF THE ACFT HEATER
SYSTEM COULD HAVE BEEN THE SOURCE OF CARBON MONOXIDE.
Probable Cause
IMPROPER INFLIGHT PLANNING/DECISION BY THE STUDENT PILOT (PILOT-IN-COMMAND), AND HIS
FAILURE TO MAINTAIN ADEQUATE AIRSPEED, WHICH RESULTED IN A STALL. FACTORS RELATED TO THE
ACCIDENT WERE: PHYSICAL IMPAIRMENT OF THE STUDENT PILOT/OWNER/OPERATOR FROM CARBON
MONOXIDE, MOUNTAINOUS TERRAIN, AND HIGH DENSITY ALTITUDE.
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