NTSB Identification: LAX85FA269.
The docket is stored on NTSB microfiche number 30843.
Accident occurred Tuesday, June 11, 1985 in VAN NUYS, CA
Aircraft: AERO COMMANDER 1121, registration: N69GT
Injuries: 4 Minor,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 PLT, EXECUTING AND ILS APCH, OBSERVED A PRIMARY HYDRAULIC PRESSURE DROP AND DECLARED HIS INTENT TO LAND WITHOUT THE USE OF FLAPS, SPEED BRAKES, REVERSERS OR NOSE WHEEL STEERING. THE ACFT RAN OFF THE END OF THE RWY DURING LANDING, TRAVELED APRX 1300 FT AND CAME TO REST ON A GOLF COURSE AFTER STRIKING 2 VEHICLES AND A CHAIN LINK FENCE. POST ACCIDENT INVESTIGATION REVEALED .8 QUARTS OF HYDRAULIC FLUID (SKYDROL) IN THE RESERVOIR. RESERVOIR CAPACITY IS 1.28 U.S. GALLONS. THE PLT STATED HE PUMPED THE BRAKES ON APCH TO BUILD PRESSURE IN THE EMERGENCY BRAKE SYSTEM. THE PLT ANNOUNCED HE HAD NO BRAKED AFTER TOUCHDOWN. THE JET COMMANDER 1121 OPERATOR'S MANUAL CAUTIONS AGAINST THIS PRACTICE. A FUNCTIONAL CHECK OF THE THRUST REVERSERS BY ON-SCENE INVESTIGATORS PRODUCED 2 COMPLETE CYCLES OF OPERATION. TWO PERSONS LOCATED IN A GROUND VEHICLE WERE INJURED DURING THE OVERRUN LANDING.

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

BRAKES(EMERGENCY)..IMPROPER USE OF..PILOT IN COMMAND

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

IMPROPER USE OF PROCEDURE..PILOT IN COMMAND

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

REVERSERS..NOT USED..PILOT IN COMMAND


Contributing Factors

HYDRAULIC SYSTEM,RESERVOIR..LOW LEVEL


Contributing Factors

BRAKES(NORMAL)..NOT POSSIBLE..OTHER MAINTENANCE PERSONNEL


Contributing Factors

AIRCRAFT PREFLIGHT..NOT PERFORMED..PILOT IN COMMAND

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