NTSB Identification: LAX83LA234.
The docket is stored on NTSB microfiche number 21039.
Accident occurred Saturday, April 02, 1983 in CALIFORNIA CITY, CA
Aircraft: LET L-13, registration: N99965
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

DURING FLT, THE GLIDER SUSTAINED IN-FLT STRUCTURAL DAMAGE WHILE MANEUVERING AT AN ALTITUDE OF APRX 17,500 FT MSL IN THE VICINITY OF CALIFORNIA CITY, CA. DURING A PRELIMINARY VERBAL STATEMENT TO AN FAA INSPECTOR, THE PLT STATED THAT HE HAD DONE A COUPLE OF LOOPS. HE SAID HE HAD JUST RECOVERED TO LEVEL FLT WHEN HE HEARD A COUPLE OF LOUD BANGS, THEN FELT A SEVERE VIBRATION IN THE CONTROLS. LATER, THE PLT INSISTED THAT NO AEROBATIC MANEUVERS WERE PERFORMED, BUT THAT HE HAD ENCOUNTER TURBULENCE & HAD 'FLOWN THRU A ROTOR.' WRINKLES WERE FOUND IN THE SKIN ON THE AFT FUSELAGE & EMPENNAGE, THE VERTICLE STABILIZER WAS DEFORMED & THE LEFT HORIZONAL STABILIZER & ELEVATOR HAD SEVERAL AREAS OF DEFORMATION. SURFACE WINDS IN THE AREA WERE FROM 270 DEG AT 22 GUSTING 28 KTS. PEAK SURFACE WINDS WERE FROM 290 DEG AT 42 KTS. STANDING LENTICULAR CLOUDS WERE REPORTED TOPPING THE MOUNTAINS & SIGMET JULIET 4 WAS IN EFFECT CAUTIONING OCCASIONAL SEVERE TURBULENCE BELOW 16,000 FT MSL.

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:

PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..MOUNTAIN WAVE


Contributing Factors

HORIZONTAL STABILIZER SURFACE..BENT


Contributing Factors

VERTICAL STABILIZER SURFACE..BENT


Contributing Factors

WEATHER CONDITION..TURBULENCE


Contributing Factors

FUSELAGE,SKIN..BUCKLED

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