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NTSB Report
August 21, 1990 · Aerospatiale/Socata TB-10 · N20AZ
Ada, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 21, 1990
Injury Outcomes
4 injuries (4 fatalities)
Location
Ada, OK
Aircraft
Aerospatiale/Socata TB-10
Tail Number
N20AZ
Operator
Peachtree Dekalb Flight Acdmy
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW90FA160
ACCORDING TO WITNESSES, THE AIRPLANE LIFTED OFF FROM THE RUNWAY ABRUPTLY, BUT IT NEVER GAIN MORE THAN ABOUT 50 TO 75 FT OF ALTITUDE, THOUGH A NOSE HIGH ATTITUDE WAS MAINTAINED. THEY ALSO STATED THAT SHORTLY AFTER LIFTOFF, THEY SAW BLACK & THEN GREY SMOKE COMING FROM THE ENGINE EXHAUST. THE AIRPLANE SUBSEQUENTLY COLLIDED WITH TREES ABOUT TWO MILES FROM THE DEPARTURE END OF THE RUNWAY. THE TEMPERATURE WAS 97 DEGREES & THE DENSITY ALTITUDE WAS ESTIMATED TO BE 3500 FEET. AN INVESTIGATION REVEALED THAT THE AIRPLANE WAS OVERLOADED BY 228 LBS & THAT THE C.G. WAS ABOUT 0.69 INCHES AFT OF THE AFT LIMIT. THE FLAPS WERE FOUND EXTENDED ABOUT 25 DEGREES; THE RECOMMENDED FLAP SETTING FOR TAKEOFF WAS 15 DEGREES.
NTSB Probable Cause
IMPROPER PLANNING/DECISION BY THE PILOT, WHICH RESULTED IN HIS FAILURE TO ATTAIN SUFFICIENT AIRSPEED FOR A CLIMB PROFILE. FACTORS RELATED TO THE ACCIDENT WERE: THE PILOT ALLOWED THE WEIGHT AND BALANCE OF THE AIRCRAFT TO EXCEED THE CERTIFIED LIMITS, HIS USE OF EXCESSIVE FLAPS AND IMPROPER LEANING OF THE MIXTURE FOR TAKEOFF, AND HIGH DENSITY ALTITUDE.
Full Narrative
ACCORDING TO WITNESSES, THE AIRPLANE LIFTED OFF FROM THE RUNWAY ABRUPTLY, BUT IT NEVER GAIN MORE THAN ABOUT 50 TO 75 FT OF ALTITUDE, THOUGH A NOSE HIGH ATTITUDE WAS MAINTAINED. THEY ALSO STATED THAT SHORTLY AFTER LIFTOFF, THEY SAW BLACK & THEN GREY SMOKE COMING FROM THE ENGINE EXHAUST. THE AIRPLANE SUBSEQUENTLY COLLIDED WITH TREES ABOUT TWO MILES FROM THE DEPARTURE END OF THE RUNWAY. THE TEMPERATURE WAS 97 DEGREES & THE DENSITY ALTITUDE WAS ESTIMATED TO BE 3500 FEET. AN INVESTIGATION REVEALED THAT THE AIRPLANE WAS OVERLOADED BY 228 LBS & THAT THE C.G. WAS ABOUT 0.69 INCHES AFT OF THE AFT LIMIT. THE FLAPS WERE FOUND EXTENDED ABOUT 25 DEGREES; THE RECOMMENDED FLAP SETTING FOR TAKEOFF WAS 15 DEGREES.
Flight
Event TypeAccident
Event Time16:50 CDT
Nearest AirportADAMUNI (0nm N)
Runway35
Runway Length5000 ft
Runway Width100 ft
Flight Plan FiledVFR
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale/Socata TB-10
Tail NumberN20AZ
Aircraft CategoryAir
DamageDestroyed
OperatorPeachtree Dekalb Flight Acdmy
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-A1AD · Reciprocating · 180
Seats5
People & Injuries
Injury Summary4 injuries (4 fatalities)
Fatal4
Serious0
Minor0
Uninjured0
Total4
Crew 1Age 43 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point63 F
Altimeter30.00 inHg
Observation Time22:00
Weather SourceWFAC