B. Fire Resistant Hydraulic Fluid - BMS 3-11 or Skydrol Assembly Lube -MCS 352 (AMM 20-30-21)
C. Rudder Lock, PCU Removed - F80150-1
D. Torque Wrench, Rudder PCU Attachment - C27025-1
3. Prepare for the Removal
A. Remove rudder systems A, B, and standby hydraulic power (AMM 27-21-0/201).
B. Remove access panels 9512 and 9514 (Ref Chapter 12, Access Doors and Panels).
C. Remove lower section of rudder hinge cover and seal from right side.
D. Open TE access door 9510 and install rigging pin R-5 (See 27-21-1/501 for location).
E. Open the YAW DAMPER circuit breakers on P6 and attach the DO-NOT-CLOSE tags.
May 01/03 27-21-92 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
W28323 W28324 W28327
Rudder Power Control Unit Installation 500
27-21-92 Page 402 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/03
500 Rudder Power Control Unit Installation
May 01/03 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-21-92 Page 403
Rudder Power Control Unit Installation 500
27-21-92 Page 404 Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/03
4. Rudder Power Control Unit Removal (Fig. 401)
CAUTION: MAKE SURE TO REMOVE THE CONTROL RODS BEFORE THE POWER CONTROL UNIT. FAILURE TO REMOVE THE CONTROL RODS FIRST CAN CAUSE DAMAGE TO THE RODS.
A. Remove the nuts, washers, washers, and bolts to disconnect the control rods from the external summing levers.
B. Remove the nuts, washers, washers, and bolts to disconnect the control rods from the input cranks and remove the control rods from the airplane.
CAUTION: DO NOT REMOVE THE UNIONS AND REDUCER FITTINGS FROM THE PCU PORTS WHEN DISCONNECTING THE HYDRAULIC LINES BECAUSE THAT WILL INCREASE THE POSSIBILITIES FOR CROSS CONNECTION OF THE LINES DURING INSTALLATION.
C. Disconnect the hydraulic lines from the PCU:
(1)
Put a container below the hydraulic connections.
(2)
Disconnect the hydraulic lines from the PCU.
(3)
Install the plugs in the hydraulic lines and caps on the port fittings.
(4)
Install a tag on the hydraulic lines to make sure you install them correctly.
D. Disconnect electrical connectors from the PCU.
CAUTION: MAKE SURE YOU HOLD THE PCU DURING THE REMOVAL OF THE FORWARD MANIFOLD. THE PCU CAN FALL. THIS CAN CAUSE DAMAGE TO THE PCU.
E. Remove the PCU:
(1)
Remove the nut, washer, nut, washer, washer, bushing, and bolt assembly to disconnect the forward manifold from the vertical fin structure.
(2)
Remove the nut, washer, nut, washer, and bolt assembly to disconnect the rod assembly from the rudder.
(3)
Remove the PCU from the airplane.
F. Install the rudder lock.
500
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-21-92 Page 405
5. Rudder Power Control Unit Installation (Fig. 401)
CAUTION: MAKE SURE THAT YOU FOLLOW THE INSTRUCTIONS TO INSTALL THE PCU CAREFULLY AND DO THE PROCEDURE IN THE SPECIFIED SEQUENCE. DAMAGE TO THE CONTROL RODS CAN OCCUR IF THE INSTRUCTIONS ARE NOT FOLLOWED CORRECTLY.
A. Remove rudder lock.
B. Install the PCU:
(1)
Put the PCU in its position with the forward manifold on the beam assembly.
(2)
Install the bushing, bolt assembly, three washers and two nuts to attach the forward manifold to the vertical fin structure.
NOTE: You must install the nuts, washers, bolt and bushings as shown in figure 401 view A-A or vibration can result in flight.
CAUTION: DO NOT TIGHTEN THE LARGER NUT AFTER YOU TIGHTEN THE SMALLER NUT. THE SMALLER NUT CAN BECOME LOOSE.
(a)
Use the torque wrench to tighten the larger nut to 750-900 pound-inches (85-102 newton-meters).
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