27-21-11
 ALL  ú ú 03 Page 414 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 714-061
 (21)
 Do the Rudder Pedal Force Test (AMM 27-21-00/501). S 094-039

 (22)
 Remove the TOW PIN from the nose landing gear (AMM 09-11-00/201).

 S 864-040

 (23)
 Remove the test equipment from the pitot-static system (AMM 34-11-00/201).

 S 864-041

 (24)
 Remove the hydraulic power (AMM 29-11-00/201).

 S 864-042

 (25)
 Remove the electrical power (AMM 24-22-00/201).

 S 414-048

 (26)
 Install the access panels.

 S 414-059

 (27)
 PASSENGER AIRPLANES; Install the ceiling panel (AMM 25-22-01/401).

 S 414-060

 (28)
 FREIGHTER AIRPLANES; Install the ceiling lining panel (AMM 25-59-01/401).

 WARNING:_______ MAKE SURE THE NOSE WHEELS POINT FORWARD.  IF THE NOSE WHEELS DO
 NOT POINT FORWARD, THE NOSE GEAR CAN QUICKLY TURN TO THE
 CENTERED POSITION WHEN YOU REMOVE THE TOW PIN.  THIS CAN CAUSE
 INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-11
 ALL  ú ú 03 Page 415 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 RUDDER FEEL, CENTERING AND TRIM MECHANISM - INSPECTION/CHECK
____________________________________________________________
 1.  General
 A.  This subject contains instructions for inspection of the rudder trim, feel, and centering mechanism.
 B.  To make an inspection of the rudder trim, feel, and centering mechanism these operations are necessary:
 -Open the access panel 324FL
 -Examine the rudder trim, feel, and centering mechanism for wear
 -Close the access panel 324FL.
 TASK 27-21-11-206-001
 2.  Rudder Trim, Feel, and Centering Mechanism Inspection_____________________________________________________
 A.  References
 (1)  
06-09-07/201, Vertical Fin Access Doors and Panels

 B.  
Access

 (1)  
Location Zone 324 Vertical Fin, Rear Spar to Trailing Edge

 (2)  
Access Panel 324FL Rudder Feel and Centering Mechanism Access Panel

 C.  
Procedure

 S 016-002
 (1)  
Open the access panel 324FL.

 S 206-003

 (2)  
Visually examine the rudder trim, feel, and centering mechanism for wear or damage.

 (a)  
Examine the springs, input crank, output crank, center shaft and cam for cracks and/or corrosion.

 (3)  
Close the access panel 324FL (Ref 06-09-07/201).

 S 416-007
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-11
 ALL  ú ú 01 Page 601 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 RUDDER RATIO CHANGER - MAINTENANCE PRACTICES
____________________________________________
 1.  General_______
 A.  The rudder ratio changer (RRC) automatically adjusts the rudder position and makes an allowance for changes in the airplane speed. When the airplane speed increases, the RRC decreases the input to the rudder power control packages (PCP) and moves the rudder in the direction of neutral. You will find the RRC connected to the rear spar of the vertical fin near the upper or lower rudder PCP.
 B.  This procedure contains these tasks:
 -
Rudder Ratio Changer Removal
　
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