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NTSB Report
September 23, 1990 · Glaser-Dirks DG 400/17 · N567DA
Truckee, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 23, 1990
Injury Outcomes
1 injury (1 minor injury)
Location
Truckee, CA
Aircraft
Glaser-Dirks DG 400/17
Tail Number
N567DA
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX90DXQ05
THE PILOT OF A SELF LAUNCHED POWERED GLIDER PERFORMED AN OPERATIONAL CHECK OF THE SPOILER PRIOR TO LANDING. THE RIGHT HAND SPOILER REMAINED DEPLOYED AFTER RETRACTION RESULTING IN AN ASYMMETRICAL LIFT CONDITION. THE PILOT WAS UNABLE TO MAINTAIN CONTROL OF THE AIRCRAFT AND COLLIDED WITH THE GROUND SHORT OF THE RUNWAY. THE CONTROL QUICK DISCONNECT SPRING PIN HAD NOT BEEN FITTED INTO THE CONTROL HOLE AS RECOMMENDED WHICH RESULTED IN THE QUICK DISCONNECT TO THE SPOILER DISCONNECTING FROM THE RIGHT HAND SPOILER ROD END BALL.
NTSB Probable Cause
THE UNCOMMANDED DEPLOYMENT OF THE RIGHT SPOILER SYSTEM DUE TO THE ABSENCE OF A SPRING PIN NOT FITTED TO THE QUICK DISCONNECT AS RECOMMENDED WHICH RESULTED IN THE PILOT LOSING CONTROL OF THE GLIDER DURING A CRITICAL PHASE OF FLIGHT.
Full Narrative
THE PILOT OF A SELF LAUNCHED POWERED GLIDER PERFORMED AN OPERATIONAL CHECK OF THE SPOILER PRIOR TO LANDING. THE RIGHT HAND SPOILER REMAINED DEPLOYED AFTER RETRACTION RESULTING IN AN ASYMMETRICAL LIFT CONDITION. THE PILOT WAS UNABLE TO MAINTAIN CONTROL OF THE AIRCRAFT AND COLLIDED WITH THE GROUND SHORT OF THE RUNWAY. THE CONTROL QUICK DISCONNECT SPRING PIN HAD NOT BEEN FITTED INTO THE CONTROL HOLE AS RECOMMENDED WHICH RESULTED IN THE QUICK DISCONNECT TO THE SPOILER DISCONNECTING FROM THE RIGHT HAND SPOILER ROD END BALL.
Flight
Event TypeAccident
Event Time18:40 PDT
Nearest AirportTruckee-Tahoe (0nm N)
Runway19
Runway Length4650 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGlaser-Dirks DG 400/17
Tail NumberN567DA
Aircraft CategoryGli
DamageSubstantial
Operating RulePart 91
Engines0
Engine TypeUnknown
Engine DetailsUnknown
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 46 · None
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO