NTSB Identification: LAX84LA242.
The docket is stored on NTSB microfiche number 24903.
Accident occurred Wednesday, April 04, 1984 in TUCSON, AZ
Aircraft: CESSNA 210, registration: N9889M
Injuries: 3 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 HAD A HYDRAULIC LINE FAILURE DURING AN ATTEMPT TO LOWER THE LANDING GEAR. THE HYDRAULIC FLUID WAS LOST AND A GEAR UP LANDING WAS MADE. THE RETAINING RING OF THE MAIN DOOR ACTUATOR HAD FAILED ALLOWING THE PISTON TO POP OUT OF THE ACTUATOR. THERE WAS A SERVICE LETTER CONCERNING THE CIRCLIP (RETAINING RING) INSPECTION AND REPLACEMENT DETAIL.

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

FLUID,HYDRAULIC..EXHAUSTION

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

DOOR,LANDING GEAR..FAILURE,PARTIAL

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

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

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..INOPERATIVE

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

GEAR EXTENSION..NOT POSSIBLE..PILOT IN COMMAND

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

HYDRAULIC SYSTEM,FITTING..FAILURE,PARTIAL

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