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 27-00-00
 ALL  ú ú 02 Page 12 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 CONTROL CABLE SYSTEMS - DESCRIPTION AND OPERATION
_________________________________________________
 1.  General_______
 A.  The primary function of the control cables in the flight control systems is to transmit the pilots' control inputs to the affected control surfaces. A typical control cable system terminates at a drum or quadrant by means of swaged terminals and has turnbuckles to allow tensioning the cable to the proper rigging load. Long cable runs are supported by idler pulleys. Air seals are used to reduce pressure loss when cables are routed through pressure bulkheads.
 B.  The control cables for the aileron, spoiler, speed brake, and flap control systems are routed from the control cabin under the passenger cabin floor to the main wheel well. The cables for the speed brake system pass through air pressure seals in the main wheel well ceiling, however, the other cables terminate at quadrants and drums above the ceiling. Aileron bus cables and spoiler control cables are routed aft of the wing rear spar to direct motion to the aileron and spoiler quadrants in the wing.
 C.  The control cables for the elevator, rudder, and stabilizer trim control systems are routed from the control cabin under the passenger cabin through air seals at the aft pressure bulkhead and into the empennage. The elevator cables are routed under the stabilizer truss. The rudder cables are routed upward ahead of the stabilizer truss.
 D.  Control cable runs are identified by coded letter designations. These cable codes identify cable function. Aluminum foil markers showing proper cable routing utilize these codes. These markers are mounted adjacent to the floor beams above the cargo compartment ceiling and in the lower nose compartment. Cable codes are shown in Table 1.
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 27-09-11
 ALL  ú ú 01 Page 1 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | Table 1 | ................................................................................ | CONTROL | | | | SYSTEM | CABLE CODE | CABLE FUNCTION | ................................................................................ | Aileron | AA | Aileron Control-Left aileron down, Right aileron | | | | up | | ................................................................. | | AB | Aileron Control-Left aileron up, Right aileron | | | | down | | ................................................................. | | ACBA | Aileron Control Bus-Left aileron down, Right | | | | aileron up | | ................................................................. | | ACBB | Aileron Control Bus-Left aileron up, Right | | | | aileron down | | ................................................................. | | ABSA | Aileron Bus System-Left aileron down, Right | | | | aileron up | | ................................................................. | | ABSB | Aileron Bus System-Left aileron up, Right | | | | aileron down | ................................................................................ | Rudder | RA | Rudder Control-Rudder left | | ................................................................. | | RB | Rudder Control-Rudder right | ................................................................................ | Elevator | EA | Elevator Control-Elevator down | | ................................................................. | | EB | Elevator Control-Elevator up | ................................................................................
 | Stabilizer |  STA  | Stabilizer Trim-Stabilizer leading edge up  |
 |  Trim  |  |  |
 |  |  STB  | Stabilizer Trim-Stabilizer leading edge down  |

 ................................................................................ | Wing Flaps | WFA | Wing Flap Control-Flaps up | | ................................................................. | | WFB | Wing Flap Control-Flaps down | | ................................................................. | | WFFA | Wing Flap Follow-up-Flaps up | | ................................................................. | | WFFB | Wing Flap Follow-up-Flaps down | ................................................................................
　
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