NTSB Identification: LAX85LA108.
The docket is stored on NTSB microfiche number 28251.
Accident occurred Friday, January 11, 1985 in SAN JOSE, CA
Aircraft: CESSNA T210L, registration: N4691Q
Injuries: 1 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 FIRST LEG OF THE FLIGHT, PLT DISCOVERED THAT LANDING GEAR WOULD NOT EXTEND. PRESSURIZING 'DOWN SIDE' WITH EMERGENCY HAND PUMP ALLOWED NORMAL OPERATION OF THE LANDING GEAR. ON RETURN FLT TO SAN JOSE, PLT TRIED TO EXTEND THE GEAR BUT SYSTEM WOULD NOT WORK WITH EITHER THE NORMAL OR EMERGENCY SYSTEM. ACFT LANDED GEAR UP AND INCURRED SUBSTANTIAL DAMAGE. SUBSEQUENT EXAMINATION OF THE HYDRAULIC SYSTEM DISCLOSED A ONE-HALF INCH PIECE OF PACKING IN THE NOSE GEAR MANIFOLD NEAR THE DOOR CLOSE VALVE, AND A THERMAL RELIEF VALVE STUCK IN THE OPEN POSITION BY A BUILD-UP OF 'DARK COLORED GREASY RESIDUE' ON THE SPRING.

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

HYDRAULIC SYSTEM,RELIEF VALVE..CONTAMINATION

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

GEAR EXTENSION..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

WHEELS UP LANDING..INITIATED..PILOT IN COMMAND

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