BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CONTROL CABLES - INSPECTION/CHECK
_________________________________
1. General_______
A. Use these procedures to verify the integrity of the control cable system. The procedures must be performed along the entire cable run in each system. To ensure verification of the portions of the cables that are in contact with pulleys and quadrants, the control cables must be moved by operation of the applicable system's controls, to expose those portions of the cables.
B. The first task is an inspection of the control cable wire rope.
C. The second task is an inspection of the control cable fittings.
D. The third task is an inspection of the pulleys.
E. These three tasks may be performed concurrently at one location of the cable system on the airplane if desired for convenience.
TASK 20-21-03-216-023
2. Inspection of the control cable wire rope._________________________________________
A. Examine the wire rope.
S 146-038
(1)
Clean the cables (as necessary) for the inspection
(AMM 12-21-05/301).
S 216-028
(2)
Perform a detailed visual inspection to make sure that the cable does not contact parts other than pulleys, quadrants, cable seals or grommets installed to control the cable routing. The minimum cable clearance from other parts is 0.20 inches, except 0.10 inches within 10 inches of a pulley or quadrant. Look for evidence of contact with other parts. Correct the condition if evidence of contact is found.
S 216-029
(3)
Perform a detailed visual inspection of the cable runs for incorrect routing, kinks in the wire rope, or other damage.
(a) Replace the cable assembly if: 1) One cable strand has worn wires where one cable strand is
decreased by more than 40 percent. (Refer to Fig. 601) 2) If a kink is found. 3) If corrosion is found.
S 216-030
(4) Perform a detailed visual inspection of the cable. To do a check for broken wires, rub a cloth along the cable. The cloth will identify broken wires by catching on them.
(a) Replace the 7 x 7 cable assembly if: 1) There is two or more broken wires in 12 continuous inches of cable.
2) There is three or more broken wires anywhere in the total cable assembly.
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20-21-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) Replace the 7 X 19 cable assembly if: 1) There is four or more broken wires in 12 continuous inches of cable.
2) There is six or more broken wires anywhere in the total cable assembly.
S 216-037
(5) Inspect the carbon steel control cable lubrication.
(a)
Make sure there is sufficient lubrication on the control cables.
(b)
If the lubrication is not sufficient, lubricate the control cable (AMM 12-21-05/301).
NOTE: Do not apply the grease or oil to the stainless steel
____ (CRES) control cables.
TASK 20-21-03-216-024
3. Inspection of the control cable fittings.
________________________________________
A. Examine the control cable fittings.
S 216-031
(1)
Perform a detailed visual inspection to make sure that the means of locking the joints are intact, (wire locking, cotter pins, turnbuckle clips, etc.). Install any missing parts.
S 216-032
(2)
Perform a detailed visual inspection of the swaged portions of swaged end fittings for surface cracks or corrosion. Replace the cable assembly if cracks or corrosion are found.
S 216-033
(3)
Perform a detailed visual inspection of the unswaged portion of the end fitting. Replace the cable assembly if a crack is visible, if corrosion is present, or if the end fitting is bent more than two degrees.
S 216-034
(4)
Perform a detailed visual inspection of the turnbuckle. Replace the turnbuckle if a crack is visible or if corrosion is present.
TASK 20-21-03-216-025
4. Inspection of pulleys.
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