Service difficulty report · Bearing · Cessna 560CESSNA

Difficulty date
September 1, 2015
Submitted
September 21, 2015
Operation
General aviation
Filed by
WTXR173J
West Star Aviation, LLC
Aircraft
N820QS
Make and model
Cessna 560CESSNA
Aircraft serial
5600650
Aircraft time
8,432 hours, 6,688 cycles
Part
Bearing
Part number
636162014
Condition
Corroded
Location
Trim Actuator
Stage of operation
CL
How discovered
O
Nature of condition
F
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

REMOVED THE BACKING PLATE FROM THE ACTUATOR TO ADJUST JACK SCREW. UNTHREADED THE OTBD JACK SCREW, PUSHING OUT THE SPLIT BEARINGS. UNTHREADED THE INBD JACK SCREW, BUT FOUND THE SPLIT BEARINGS WERE SEIZED/CORRODED INTO THE ACTUATOR HOUSING. PUMPED GREASE INTO THE INBD JACKSCREW HOUSING AND NOTED THE SPLIT BEARINGS WERE PUSHED OUT APPROXIMATELY 0625" BEFORE SEIZING AGAIN. ATTEMPTED TO CONTINUE UNTHREADING THE JACK SCREW IN AN EFFORT TO DRIVE THE SPLIT BEARINGS OUT, BUT FOUND THIS TO BE INEFFECTIVE. CONTINUED PUMPING GREASE INTO THE ACTUATOR AND SIMULTANEOUSLY UNTHREADING THE JACK SCREW UNTIL THE SPLIT BEARINGS RELEASED FROM THE ACTUATOR HOUSING.