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20-11-03
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A 747-400 MAINTENANCE MANUAL
(3) S 434-024Install the turnbuckles with the turnbuckle barrel installed an equal distance on the two threaded terminals. Do not let more than three threads show out of the barrel.
(4) S 034-025Remove the cable clamps and rigging pins from the control cable and drums.
(5) S 434-026Tighten the cable as told in the temperature - tension chart in the system chapter.
NOTE:____ Use a tensiometer to do a check on the cable tension. Apply the tensiometer to the cable at least six inches from the turnbuckle terminal or other fittings. To make sure you have the correct cable tension, permit a minimum of one hour at constant ambient temperature (|5°F) for airplane temperature to become stable.
(6) S 714-027If a new cable is installed, operate the system for a number of test cycles, with cables tightened to two times the working tension. See the applicable chapter for tension specifications.
(7) S 834-028Make the last rigging adjustments. Refer to the applicable chapter for rigging load and test cycle tables.
(8) S 214-029Make sure the air seals are correctly adjusted after installation (AMM 20-11-04).
NOTE:____ Correctly adjusted seals stop deflection of the cable and make sure the cable is free to move.
(9) S 244-036The minimum clearance from the adjacent structure shall be as follows.
NOTE:____ The clearances that follow are general guidelines only. Refer to the applicable chapter to find any special conditions for a specific system.
(a) Between different cable systems - 0.50 inch
NOTE:____ A clearance of 2.00 inches is recommended.
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747-400 MAINTENANCE MANUAL
(b) Between structure, wiring, tubing and fixed equipment:
At a fairlead - 0.50 inch
At a rubstrip - 0.10 inch
NOTE:____ A clearance of 1.50 inches is recommended below the
cable, and 1.00 inch is recommended in the other
directions.
(c) Between doors, landing gear, and components that move -
2.00 inches.
NOTE:____ A clearance of 4.00 inches is recommended.
(d) Cables my sag to the lower surface of grommets at RBL 103.7 and
RBL 106.25, WL 197.5, between STA 660 and 1250.
S 434-030
(10)
Install the turnbuckle locking clips on all the turnbuckles adjusted (AMM 20-11-02).
S 434-031
(11)
Install the cable stop if applicable (AMM 20-11-17).
S 714-032
(12)
Operate controls through full travel to make sure that they move freely and that too much force is not necessary.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-11-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
CONTROL CABLE AIR PRESSURE SEAL - REMOVAL/INSTALLATION
______________________________________________________
1. General_______
A. Six tasks are provided in this subject. The first is removal of control cable air pressure seal. The second is installation of control cable air pressure seal. The third is removal of engine throttle control cable air pressure seal. The fourth is installation of engine throttle control cable air pressure seal. The fifth is removal of aileron, flap, or speed brakes control cable raised seal. The sixth is installation of aileron, flap, or speed brake control cable raised seal.
B. Paragraphs 2 and 3 provide removal and installation for pressure bulkhead control cabin air pressure seals.
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