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NTSB Report
September 17, 1988 · Snyder Stolp SA-300 Stolp SA-3 · N57DH
Oklahoma City, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 17, 1988
Injury Outcomes
1 injury (1 fatality)
Location
Oklahoma City, OK
Aircraft
Snyder Stolp SA-300 Stolp SA-3
Tail Number
N57DH
Operator
Howard H David
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW88DPJ12
WITNESSES RPRTD THE PLT WAS DOING AEROBATICS NEAR THE ARPT. THEY OBSERVED TWO SNAP ROLLS, THEN SAW THE ACFT ENTER A SPIN TO THE RIGHT. THE WITNESSES SAID THE ACFT WAS MANEUVERING AT AN ESTIMATED 1,500 TO 1,900 FEET AGL, THEN IT SPUN, UNCORRECTED TO GROUND IMPACT. AN INVESTIGATION REVEALED THAT IN THE REAR COCKPIT, THE RUDDER CABLE ATTACHMENT ON THE LEFT RUDDER PEDAL HAD FAILED. A METALLURGICAL EXAMINATION REVEALED THE FRACTURE WAS TYPICAL OF OVERSTRESS, BUT THE WELDED AREA HAD VOIDS & THERE WAS A LACK OF FUSION & PENETRATION IN THE WELDED AREA.
NTSB Probable Cause
TOTAL FAILURE OF THE RUDDER CONTROL DUE TO FAILURE OF THE METAL WELDS ON THE CABLE ATTACHMENT TO THE RUDDER PEDAL, DUE TO IMPROPER WELDING BY THE MANUFACTURER.
Full Narrative
WITNESSES RPRTD THE PLT WAS DOING AEROBATICS NEAR THE ARPT. THEY OBSERVED TWO SNAP ROLLS, THEN SAW THE ACFT ENTER A SPIN TO THE RIGHT. THE WITNESSES SAID THE ACFT WAS MANEUVERING AT AN ESTIMATED 1,500 TO 1,900 FEET AGL, THEN IT SPUN, UNCORRECTED TO GROUND IMPACT. AN INVESTIGATION REVEALED THAT IN THE REAR COCKPIT, THE RUDDER CABLE ATTACHMENT ON THE LEFT RUDDER PEDAL HAD FAILED. A METALLURGICAL EXAMINATION REVEALED THE FRACTURE WAS TYPICAL OF OVERSTRESS, BUT THE WELDED AREA HAD VOIDS & THERE WAS A LACK OF FUSION & PENETRATION IN THE WELDED AREA.
Flight
Event TypeAccident
Event Time11:27 CDT
Nearest AirportSUNDANCE (0nm N)
Runway17
Runway Length5000 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSnyder Stolp SA-300 Stolp SA-3
Tail NumberN57DH
Aircraft CategoryAir
DamageDestroyed
OperatorHoward H David
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360 · Reciprocating · 180
Seats2
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 44 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind200° @ 10 kt
Visibility8 sm
CeilingNone
Altimeter30.00 inHg
Observation Time16:00
Weather SourceWFAC