NTSB Identification: CHI87LA200.
The docket is stored on NTSB microfiche number 34406.
Nonscheduled 14 CFR
Accident occurred Wednesday, September 02, 1987 in APPLETON, WI
Probable Cause Approval Date: 10/25/1988
Aircraft: AERO COMMANDER 690, registration: N9168N
Injuries: 5 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.

THE PLT RPRTD THAT AFTER THE ACFT WAS AT CRUISE FLT, THERE WAS A RAPID LOSS OF HYDRAULIC PRESSURE. HE RETURNED TO THE DEP ARPT, BUT WAS UNABLE TO GET THE LEFT MAIN GEAR TO LOCK DOWN. SUBSEQUENTLY, THE LEFT MAIN GEAR COLLAPSED WHEN THE ACFT WAS LANDED. AN INVESTIGATION REVEALED A HYDRAULIC LINE IN THE LEFT WING HAD FAILED WHICH HAD ALLOWED A LOSS OF HYDRAULIC FLUID & PRESSURE. ALSO, THERE WAS A STICKING PRIORITY VALVE. WITH THESE PROBLEMS, THE GEAR COULD NOT BE EXTENDED WITH EITHER THE NORMAL OR EMERG SYS.

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

HYDRAULIC SYSTEM,LINE..RUPTURED

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

HYDRAULIC SYSTEM,BYPASS VALVE..BINDING(MECHANICAL)



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