(2)  
Skydrol Assembly Lube - MCS 352

B.  Prepare for Removal
(1)  
Remove rudder standby system hydraulic power. Refer to 27-21-0, Rudder and Rudder Trim Control System - Maintenance Practices.

(2)  
Open FLT CONTR and STBY RUD circuit breakers on load control panel P6.

C.  Remove Standby Rudder Actuator Shutoff Valve
(1)  
Disconnect electrical connector from valve motor.

(2)  
Remove four valve mounting bolts attaching shutoff valve body to modular package housing.

(3)  
Carefully remove shutoff valve from modular package housing by turning slightly and lifting straight up.

CAUTION: BE PREPARED TO CATCH SPILLED HYDRAULIC FLUID.

(4)  
Take necessary precautions to prevent dirt entering shutoff valve cavity when valve is removed.

500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-131 Page 401 

G09237
Standby Rudder Actuator Shutoff Valve Installation  500 
27-21-131  Figure 401  Aug 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Prepare for Installation
(1)  
Remove rudder standby system hydraulic power. Refer to 27-21-0.

(2)  
Check that FLT CONTR and STBY RUD circuit breakers on panel P6 are open.

E.  Install Standby Rudder Actuator Shutoff Valve
(1)  
Install five 0-rings with backup rings on replacement valve. (See figure 401.) Lightly lubricate 0 -rings and backup rings with hydraulic fluid or Skydrol assembly lube at installation.

(2)  
Carefully insert shutoff valve into modular package housing.

(3)  
Install four mounting bolts. Tighten bolts within 30 to 40 pound-inch torque range.

(4)  
Install lockwire on four mounting bolts.

(5)  
Install electrical connector at valve motor.

(6)  
Restore airplane to normal hydraulic configuration. Refer to 27-21-0.

(7)  
Test shutoff valve. Refer to Standby Rudder Actuator Shutoff Valve - Adjustment/Test.

(8)  
Check hydraulic reservoir and service, if required.

(9)  
Close all access doors and install access panels.

3.  Removal/Installation Standby Rudder Actuator Shutoff Valve Motor
NOTE:  Use this procedure when replacing the valve motor only. When replacing the motor and valve use the procedure in paragraph 2.
A.  Prepare for Removal
(1)  
Remove rudder system standby hydraulic power. Refer to 27-21-0.

(2)  
Open FLT CONTR and STBY RUD circuit breakers on panel P6.

B.  Remove Standby Rudder Actuator Shutoff Valve Motor
(1)  
Disconnect electrical connector from valve motor.

(2)  
Move manual override lever to position 2.

(3)  
Remove four mounting screws (figure 401) attaching valve motor to valve. Remove valve motor from valve. Remove valve motor from valve.

500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-131 Page 403 

C.  Prepare for Installation
(1)  
Remove rudder hydraulic system standby power. Refer to 27-21-0.

(2)  
Check that FLT CONT and STBY ROD circuit breakers on panel P6 are open.

D.  Install Standby Rudder Actuator Shutoff Valve Motor
(1)  
On replacement of valve motor, move manual override lever to position 2.

(2)  
Position valve motor on valve and engage motor drive with valve cam. (See figure 401.)

(3)  
Install the four mounting screws.

(4)  
Install lockwire on mounting screws.

(5)  
Install electrical connector on valve motor.

(6)  
Restore airplane to normal hydraulic configuration. Refer to 27-21-0.

(7)  
Test Shutoff valve. See Standby Rudder Actuator Shutoff Valve - Adjustment/Test.

(8)  
Close all access doors and install access panels.

500 
27-21-131 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/73 

STANDBY RUDDER ACTUATOR SHUTOFF VALVE -ADJUSTMENT/TEST
1. Standby Rudder Actuator Shutoff Valve Test
A.  Connect electrical power to airplane.
B.  Check that FLT CONTR and STBY RUD circuit breakers on load control panel P6-2 are closed.
　
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