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NTSB Report
December 25, 1991 · Grumman American AA-5A · N9991U
Monte Vista, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 25, 1991
Injury Outcomes
3 injuries (3 fatalities)
Location
Monte Vista, CO
Aircraft
Grumman American AA-5A
Tail Number
N9991U
Operator
Fred Schrotenboer
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
DEN92FA020
WHILE ON A POST TAKEOFF CROSSWIND CLIMB, THE PILOT INADVERTENTLY STALLED THE AIRCRAFT AT A LOW ALTITUDE. THE AIRCRAFT IMPACTED VERTICALLY IN A FROZEN OPEN FIELD. INVESTIGATION REVEALED THE AIRCRAFT TO BE 90 POUNDS OVER MAXIMUM GROSS WEIGHT; THE PILOT TO BE SUFFERING FROM PHYSICAL IMPAIRMENT DUE TO CARBON MONOXIDE POISONING; THE PILOT TO BE LOW IN TOTAL EXPERIENCE, EXPERIENCE IN TYPE; AND RECENT EXPERIENCE. TOXICOLOGY TESTS REVEALED 16% CARBOXYHEMOGLOBIN IN THE PILOT'S BLOOD. PASSENGER TEST RESULTS WERE NEGATIVE. THAT SATURATION LEVEL CAN CAUSE DEGRADATION IN JUDGMENT AND PERFORMANCE. THE PILOT WAS A MECHANIC AND HAD BEEN EXPOSED TO RUNNING ENGINES IN A NON-VENTILATED SHOP THE DAY/EVENING PRIOR TO THE ACCIDENT.
NTSB Probable Cause
AN INADVERTENT STALL BY THE PILOT IN COMMAND AT AN ALTITUDE INSUFFICIENT TO EFFECT RECOVERY. FACTORS WERE: AIRCRAFT GROSS WEIGHT ABOVE MAXIMUM; PHYSICAL IMPAIRMENT OF THE PILOT; LACK OF TOTAL EXPERIENCE; LACK OF RECENT EXPERIENCE; AND LACK OF EXPERIENCE IN TYPE.
Full Narrative
WHILE ON A POST TAKEOFF CROSSWIND CLIMB, THE PILOT INADVERTENTLY STALLED THE AIRCRAFT AT A LOW ALTITUDE. THE AIRCRAFT IMPACTED VERTICALLY IN A FROZEN OPEN FIELD. INVESTIGATION REVEALED THE AIRCRAFT TO BE 90 POUNDS OVER MAXIMUM GROSS WEIGHT; THE PILOT TO BE SUFFERING FROM PHYSICAL IMPAIRMENT DUE TO CARBON MONOXIDE POISONING; THE PILOT TO BE LOW IN TOTAL EXPERIENCE, EXPERIENCE IN TYPE; AND RECENT EXPERIENCE. TOXICOLOGY TESTS REVEALED 16% CARBOXYHEMOGLOBIN IN THE PILOT'S BLOOD. PASSENGER TEST RESULTS WERE NEGATIVE. THAT SATURATION LEVEL CAN CAUSE DEGRADATION IN JUDGMENT AND PERFORMANCE. THE PILOT WAS A MECHANIC AND HAD BEEN EXPOSED TO RUNNING ENGINES IN A NON-VENTILATED SHOP THE DAY/EVENING PRIOR TO THE ACCIDENT.
Flight
Event TypeAccident
Event Time14:30 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman American AA-5A
Tail NumberN9991U
Aircraft CategoryAir
DamageDestroyed
OperatorFred Schrotenboer
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-E2G · Reciprocating · 150
Seats4
People & Injuries
Injury Summary3 injuries (3 fatalities)
Fatal3
Serious0
Minor0
Uninjured0
Total3
Crew 1Age 37 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind190° @ 5 kt
Visibility60 sm
CeilingNone
Temperature / Dew Point10 C / 0 C
Altimeter0
Weather SourceWIT