NTSB Identification: LAX87LA104.
The docket is stored on NTSB microfiche number 32489.
Accident occurred Saturday, January 31, 1987 in MARANA, AZ
Probable Cause Approval Date: 03/21/1988
Aircraft: SCHWEIZER SGS 2-33, registration: N5727S
Injuries: 1 Serious.

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 A WINCH TOW, THE CABLE PREMATURELY RELEASED THE GLIDER AT APPROXIMATELY 100 TO 150 FEET. THE GLIDER REMAINED IN A NOSE HIGH ATTITUDE MOMENTARILY THEN BEGAN A SHALLOW DESCENDING RIGHT TURN. AT APPROXIMATELY 75 FEET THE ROLL, PITCH, AND DESCENT RATE ACCELERATED. THE GLIDER COMPLETED APPROXIMATELY 140 DEGREES OF TURN THEN COLLIDED WITH THE TERRAIN IN A STEEP NOSE DOWN ATTITUDE. SERVICE BULLETIN NO. SA-001 AND AIRWORTHINESS DIRECTIVE 87-02-01 WERE ADOPTED TO PREVENT THE POSSIBILITY OF AN INADVERTENT TOW-HOOK RELEASE DURING TOWING OPERATIONS. THE AD HAD NOT BEEN COMPLIED WITH AT THE TIME OF THE ACCIDENT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

GLIDER LAUNCH/TOW EQUIPMENT..DEPLOYED INADVERTENTLY


Contributing Factors

TERRAIN CONDITION..HIGH VEGETATION


Contributing Factors

MAINTENANCE,COMPLIANCE WITH AD..NOT PERFORMED..COMPANY/OPERATOR MANAGEMENT


Contributing Factors

LACK OF TOTAL EXPERIENCE IN KIND OF AIRCRAFT..PILOT IN COMMAND


Contributing Factors

MAINTENANCE,SERVICE BULLETIN/LETTER..NOT FOLLOWED..COMPANY/OPERATOR MANAGEMENT

Index for Jan1987 | Index of months