SDR 2002F00037

Service difficulty report · Torque Tube · Cessna 421C

Difficulty date
December 21, 2001
Submitted
December 21, 2001
Operation
Air carrier
Aircraft
N6793V
Make and model
Cessna 421C
Aircraft serial
421C1022
Aircraft time
4,401 hours
Engine
Cont GTSIO520N
Propeller
Mcauly 3FF32C501
Part
Torque Tube
Part number
50934042
Condition
Corroded
Location
Elevator
Part time
4,401 hours
Component
Elevator · Cessna
Component part number
503400044
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

DURING A AAIP 100 HOUR INSPECTION, SEVERE CORROSION WAS NOTED IN THE RIGHT ELEVATOR TORQUE TUBE. THE CORROSION (RUST) HAS DEPLETED AT LEAST 75% OF THE MATERIAL THICKNESS. THE LEFT ELEVATOR WAS REMOVED TO INSPECT THE TORQUE TUBE FOR CORROSION. NONE WAS NOTED. THE RIGHT ELEVATOR HAS THE TRIM TAB ASSEMBLY. THE TORQUE TUBE END IS EXPOSED TO THE ELEMENTS WHERE THE TRIM TAB ROD END PASSES THROUGH THE ELEVATOR.

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