Service difficulty report · Actuator · Cessna T210N

Difficulty date
March 5, 2002
Submitted
March 20, 2002
Operation
Air carrier
Aircraft
N4672Y
Make and model
Cessna T210N
Aircraft serial
21063977
Engine
Cont TSIO520*
Part
Actuator
Part number
98820152
Condition
Broken
Location
Mlg
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

ACTUATOR PISTON SERVES AS A RACK WITH GEAR TEETH CUT INTO THE BOTTOM PART OF THE PISTON. THE RACK DRIVES A PINION GEAR ATTACHED TO THE GEAR LEG. THE RACK PISTON IS HELD IN ENGAGEMENT WITH THE PINION BY A HARDENED STEEL ROLLER ON TOP OF THE RACK. THE ROLLER IS SUPPORTED BY TWO NEEDLE BEARINGS. AN ANNUAL INSPECTION IT WAS FOUND THAT THE ROLLER AND ITS BEARINGS WERE ON THE FLOOR OF THE ACTUATOR COMPARTMENT. EVIDENTLY A HARD LANDING HAD BROKEN THE ACTUATOR HOUSING AT BOTH SIDES WITH NO ROLLER TO SUPPORT IT, THE RACK WAS BARELY ENGAGING THE PINION. RECOMMEND CLOSE INSPECTION OF ACTUATOR HOUSING AT ROLLER BEARING AREA.

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