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NTSB Report
July 24, 1994 · Let L-23 · N923SB
Stillwater, OK
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
July 24, 1994
Injury Outcomes
No injuries (2 uninjured)
Location
Stillwater, OK
Aircraft
Let L-23
Tail Number
N923SB
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW94LA250
DURING AN INSTRUCTIONAL FLIGHT, A GLIDER WAS BEING TOWED BY A CAR AS PART OF THE STUDENT PILOT'S QUALIFICATION. AFTER SEPARATION FROM THE TOWING VEHICLE, THE INSTRUCTOR PILOT NOTICED THAT THE GLIDER WAS NOT GAINING AIRSPEED. THE AIRCRAFT THEN STALLED AND STRUCK THE GROUND.
NTSB Probable Cause
THE CERTIFIED FLIGHT INSTRUCTOR'S FAILURE TO MAINTAIN FLYING SPEED.
Full Narrative
On July 24, 1994, approximately 1000 central daylight time, a Let L-23 glider, N923SB, was substantially damaged during take- off. The instructor pilot and his student were not injured. Visual meteorological conditions prevailed for the 14 CFR 91 flight. During an interview conducted by a Federal Aviation Administration inspector, the instructor pilot reported that the glider was being towed by car for takeoff as part of a student qualification. After separation from the towing vehicle the instructor pilot felt that they were not gaining airspeed and stalled. The glider struck the ground resulting in structural damage.
Flight
Event TypeAccident
Event Time10:00 CDT
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftLet L-23
Tail NumberN923SB
Aircraft CategoryGli
DamageSubstantial
Operating RulePart 91
Engine TypeUnknown
Engine DetailsUnknown
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1First Class
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 9 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point64 F
Altimeter30.00 inHg
Observation Time16:56
Weather SourceWFAC