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NTSB Report
July 11, 1989 · Cessna 150L · N17250
Fort Worth, TX
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 11, 1989
Injury Outcomes
2 injuries (1 serious injury, 1 minor injury)
Location
Fort Worth, TX
Aircraft
Cessna 150L
Tail Number
N17250
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
FTW89FA134
IMMEDIATELY AFTER LIFTOFF THE NEWLY-CERTIFICATED PILOT BECAME AWARE THAT THE FLAPS WERE FULL DOWN. HE WAS UNABLE TO RAISE THEM AND THE AIRCRAFT STALLED WHILE IN A CLOSED TRAFFIC PATTERN. AN AGS-15 NON-SLOBLO FUSE WAS FOUND TO BE BLOWN. THE FLAP DOWN LIMIT SWITCH WAS OUT OF ADJUSTMENT RESULTING IN THE JACKSCREW TRAVELING TO THE MECHANICAL LIMIT & EVENTUALLY CAUSING AN ELECTRICAL OVERLOAD. THE FUSE WAS REPLACED TWICE WITHIN THE PREVIOUS 45 DAYS. FOUR OTHER AIRCRAFT OF THE OPERATOR'S FLEET ALSO HAD INCORRECT FUSES INSTALLED. THE PILOT HAD LOWERED THE FLAPS FOR HIS WALK-AROUND. THE OPERATOR (SCHOOL) HAD DEVELOPED THEIR OWN CHECKLIST DIFFERENT FROM THAT CONTAINED IN THE APPROVED OWNER'S MANUAL. THIS CHECKLIST CALLED FOR LOWERING OF FLAPS DURING PRE-START INSPECTION AND RAISING OF FLAPS DURING AFTER-START. THE CHECKLIST DID NOT CONTAIN A SPECIFIC ENTRY TO CHECK THAT THE FLAPS WERE UP PRIOR TO TAKEOFF.
NTSB Probable Cause
A LOSS OF CONTROL OF THE AIRPLANE DUE TO THE PILOT'S INABILITY TO RAISE THE FLAPS WHICH RESULTED IN A STALL. THE FLAP FAILURE AND SUBSEQUENT FULL FLAP TAKEOFF WERE THE RESULT OF THE OPERATOR'S IMPROPER MAINTENANCE OF THE AIRPLANE AND THE OPERATOR'S USE OF A CUSTOM CHECKLIST THAT DEVIATED SIGNIFICANTLY FROM THE MANUFACTURER'S APPROVED CHECKLIST. CONTRIBUTING TO THE ACCIDENT WERE THE PILOT'S FAILURE TO ENSURE THAT THE FLAPS WERE FULLY RETRACTED PRIOR TO TAKEOFF, AND THE OPERATOR'S INADEQUATE INITIAL TRAINING OF THE PILOT.
Full Narrative
IMMEDIATELY AFTER LIFTOFF THE NEWLY-CERTIFICATED PILOT BECAME AWARE THAT THE FLAPS WERE FULL DOWN. HE WAS UNABLE TO RAISE THEM AND THE AIRCRAFT STALLED WHILE IN A CLOSED TRAFFIC PATTERN. AN AGS-15 NON-SLOBLO FUSE WAS FOUND TO BE BLOWN. THE FLAP DOWN LIMIT SWITCH WAS OUT OF ADJUSTMENT RESULTING IN THE JACKSCREW TRAVELING TO THE MECHANICAL LIMIT & EVENTUALLY CAUSING AN ELECTRICAL OVERLOAD. THE FUSE WAS REPLACED TWICE WITHIN THE PREVIOUS 45 DAYS. FOUR OTHER AIRCRAFT OF THE OPERATOR'S FLEET ALSO HAD INCORRECT FUSES INSTALLED. THE PILOT HAD LOWERED THE FLAPS FOR HIS WALK-AROUND. THE OPERATOR (SCHOOL) HAD DEVELOPED THEIR OWN CHECKLIST DIFFERENT FROM THAT CONTAINED IN THE APPROVED OWNER'S MANUAL. THIS CHECKLIST CALLED FOR LOWERING OF FLAPS DURING PRE-START INSPECTION AND RAISING OF FLAPS DURING AFTER-START. THE CHECKLIST DID NOT CONTAIN A SPECIFIC ENTRY TO CHECK THAT THE FLAPS WERE UP PRIOR TO TAKEOFF.
Flight
Event TypeAccident
Event Time18:42 CDT
Nearest AirportMEACHAM (0nm N)
Runway27
Runway Length4050 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 150L
Tail NumberN17250
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-200-A · Reciprocating · 100
Seats2
People & Injuries
Injury Summary2 injuries (1 serious injury, 1 minor injury)
Fatal0
Serious1
Minor1
Uninjured0
Total2
Crew 1Age 21 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind170° @ 11 kt
Visibility15 sm
CeilingBroken clouds 25000 ft
Altimeter30.00 inHg
Observation Time23:51
Weather SourceWFAC