NTSB Identification: ATL85LA184.
The docket is stored on NTSB microfiche number 28871.
Accident occurred Wednesday, June 12, 1985 in KNOXVILLE, TN
Aircraft: CESSNA T337G, registration: N30S
Injuries: 4 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 ACFT MADE AN EMERGENCY GEAR UP LANDING WHEN BOTH THE NORMAL AND EMERGENCY EXTENSION SYSTEMS FAILED TO FUNCTION PROPERLY. A MECHANIC WAS LATER ABLE TO EXTEND THE GEAR WITH THE ACFT ON JACKS BY REPEATEDLY CYCLING THE SELECTOR SWITCH.IT WAS DETERMINED THAT THE SOLENOID ON THE LANDING GEAR HYDRAULIC MANIFOLD ASSEMBLY HAD MALFUNCTIONED, LEAVING THE SELECTOR VALVE ASSEMBLY STUCK IN THE UP POSITION. CESSNA SERVICE LETTER SE76-24 RECOMMENDS REPLACEMENT OF THE SOLENOID WITH AN IMPROVED VERSION. ACCORDING TO THE MECHANIC, THIS HAD NOT BEEN ACCOMPLISHED PRIOR TO THE ACCIDENT.

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

LANDING GEAR..INOPERATIVE

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

HYDRAULIC SYSTEM,BYPASS VALVE..INOPERATIVE

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

ELECTRICAL SYSTEM,ELECTRIC SWITCH..JAMMED

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

MAINTENANCE,SERVICE BULLETIN/LETTER..NOT PERFORMED..OTHER MAINTENANCE PERSONNEL


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