NTSB Identification: DEN83FTE05.
The docket is stored on NTSB microfiche number 19669.
14 CFR Part 91: General Aviation
Accident occurred Thursday, January 06, 1983 in COLO SPRINGS, CO
Aircraft: SCHWEIZER 1-36, registration: N36166
Injuries: 1 Uninjured.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
THE GLIDER WAS SUBSTANTIALLY DAMAGED DURING A PULLUP FROM A DIVE AT ALTITUDE. THE WING WAS RIPPLED AND BECKLED AND DAMAGED AT THE ATTACH POINTS. THE DIHEDRIAL HAD CHANGED FROM 6 DEGREES TO 8.5 DEGREES. THERE WAS ALSO UNMEASURED CHANGE IN THE SWEEPBACK. IT IS BELIEVED THAT THE PILOT ACHIEVED THE AIRSPEED ESTIMATED FROM THE BAROGRAPH AT 146 MPH BY RETRACTING THE SPEED BRAKES DURING THE DIVE. MAXIMUM AIRSPEED IS 136 MPH FOR THIS GLIDER. THE PILOT DOES NOT RECALL THE PULLUP EXCEPT FOR NEGATIVE G'S AT THE TOP. POSITIVE G FORCES WERE ESTIMATED AT 10.5 TO 11. THE AIRCRAFT MADE A NORMAL LANDING AFTER THE FLIGHT.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:DESIGN STRESS LIMITS OF AIRCRAFT..EXCEEDED..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:SPEED BRAKES..IMPROPER USE OF..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:AIRSPEED..EXCESSIVE..PILOT IN COMMAND
WING,WING ATTACHMENT BOLT..DISTORTED
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