27-21-24
 ALL  ú ú 01 Page 401 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
STANDBY RUDDER ACTUATOR SEE A
PLATE WEAR 
(VIEW FROM THE LEFT) STANDBY RUDDER ACTUATOR  B STANDBY RUDDER ACTUATOR SEE 
A 
0.01 INCH MINIMUM  NYLON WEAR WASHER  A-A  0.01 INCH MINIMUM LOCKNUT ROD END  INPUT CRANK A  A 
RUDDER 
INPUT ROD 
ROD END LOCKNUT  VERTICAL FIN LINES HYDRAULIC  ACTUATOR RUDDER STANDBY FWD 
STANDBY RUDDER ACTUATOR 
B 
Standby Rudder Actuator Installation Figure 401 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-24
 ALL  ú ú 01 Page 402 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 E. Procedure (Fig. 401)
 S 034-005
 (1)  
Disconnect the hydraulic lines from the actuator.

 S 034-006

 (2)  
Put caps on the hydraulic lines and the actuator ports to keep contamination out.

 S 034-007

 (3)  
Disconnect the input rod from the actuator.

 S 024-008

 (4)  
Disconnect the forward end of the actuator from the structure of the vertical fin.

 S 024-009

 (5)  
Disconnect the aft end of the actuator from the rudder.

 S 024-010

 (6)  
Remove the actuator from the airplane.

 TASK 27-21-24-404-011
 3.  Standby Rudder Actuator Installation____________________________________
 A. Special Tools and Equipment
 (1)  F70207-93 Rig Pin Kit:
 -------------------------------------------------------------------| | | DIAMETER | LENGTH | | | REF NO. | F70207-| (INCHES) | (INCHES) | FUNCTION | -------------------------------------------------------------------| R-5 | -11 | 0.309-0.311 | 6.7 -0.25 | RUDDER FEEL AND | | | | | | CENTERING UNIT | -------------------------------------------------------------------
B. References
 (1)  
12-12-00-3 Hydraulic Reservoir Servicing

 (2)  
27-21-24/501 Standby Rudder Actuator

 (3)  
27-21-24/601 Standby Rudder Actuator

 C.
Access

 (1)  
Location Zones
 706 Vertical Fin
 708 Rudder

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-24
 ALL  ú ú 01 Page 403 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  
Access Panels
 9515L TE Access Panel - Rudder
 9528R Access Door - Rudder
 9529R Access Door - Rudder
 9555R Cover - Rudder Nose
 9556L Cover - Rudder Nose

 D.
Procedure

 S 224-012
 (1)  
Make sure the bearings and bolts for the standby rudder actuator are not worn too much (Ref 27-21-24/601).

 S 424-013

 (2)  
Put the actuator in its position.

 S 424-014

 (3)  
Install the bolts, the washers, the nylon wear washers (on the aft end of the PCU connection only) and the nuts to attach the actuator to the airplane (Fig. 401).

 NOTE: The quantity of the wear washers is as the clearance allows.
____ The maximum number of washers allowed is 3.
 (a)  
If you use a castellated nut at the aft (rudder) end of the actuator, tighten it to 130-180 pound-inches. 1) Install a cotter pin for the nut.

 (b)  
If you use a self-locking nut at the aft (rudder) end of the actuator, tighten it to 400-500 pound-inches.

 (c)  
Tighten the nut on the forward (vertical fin) end of the actuator to 500-600 pound-inches. 1) Install a cotter pin for the nut.

 S 434-015
 (4)  
Remove the caps from the hydraulic lines and the ports.

 S 434-016

 (5)  
Connect the hydraulic lines to the actuator.
　
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