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(c) Remove the tape (that has the mark on it) from the airplane.
SUBTASK 27-21-17-420-002
(2) If there is not a tape with a mark that shows the correct position, then do these steps to install the
rudder index plate [1]:
(a) Put the rudder index plate [1] in its position (Figure 401).
(b) Install the screws [2] and washers [3] to install the rudder index plate [1].
(c) Make sure the rudder index plate [1] is set at 0.78 +0.02/-0.01 inch (19.8 +0.5/-0.2 mm)
(Figure 401).
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STANDBY RUDDER POWER CONTROL UNIT - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the standby rudder power control unit (PCU)
(2) An installation of the standby rudder PCU.
TASK 27-21-24-000-801
2. Standby Rudder Power Control Unit Removal
(Figure 401)
A. References
Reference Title
27-21-00-800-802 Remove Pressure from the Rudder Hydraulic Systems A, B, and
Standby (P/B 201)
B. Tools/Equipment
Reference Description
STD-203 Container - Oil Resistant, 1 U.S.-Gal (3.8 l)
C. Location Zones
Zone Area
324 Vertical Fin - Rear Spar To Trailing Edge
D. Access Panels
Number Name/Location
324DL Trailing Edge Access
E. Prepare for the Removal
SUBTASK 27-21-24-860-001
(1) Do this task: Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby,
TASK 27-21-00-800-802.
SUBTASK 27-21-24-860-002
(2) Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 7 C00285 YAW DAMPER AC
D 6 C01354 YAW DAMPER 2 DC
D 7 C00286 YAW DAMPER 1 DC
SUBTASK 27-21-24-010-002
(3) Remove this access panel:
Number Name/Location
324DL Trailing Edge Access
F. Standby Rudder PCU Removal
SUBTASK 27-21-24-020-001
(1) Disconnect the hydraulic lines [12] from the power control unit [4].
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(a) Put a 1 U.S.-gal (3.81 l) oil resistant container, STD-203 below the hydraulic connections.
(b) Disconnect the hydraulic lines [12] from the power control unit [4].
(c) Install the plugs and caps to the hydraulic lines and ports.
(d) Install a tag on the hydraulic lines [12] to make sure you install them correctly. Discard the
packing [3] and packing [11].
SUBTASK 27-21-24-020-002
(2) Disconnect the electrical connector [1] from the power control unit [4].
SUBTASK 27-21-24-020-003
(3) Disconnect the vernier control rod [9] from the power control unit [4]:
(a) Remove the nut [8], washer [7], washer [6], and bolt [5] to disconnect the control rod [9]
from the power control unit [4].
SUBTASK 27-21-24-020-004
(4) Remove the power control unit [4]:
(a) Remove the nut [24], washers [23], bushing [22], washer [21], and bolt [20] to disconnect the
power control unit [4] from the rudder.
CAUTION: MAKE SURE THAT YOU HOLD THE STANDBY RUDDER PCU DURING THE
REMOVAL OF THE STANDBY RUDDER PCU. THE STANDBY RUDDER PCU CAN
FALL. THIS CAN CAUSE DAMAGE TO THE STANDBY RUDDER PCU.
(b) Remove the nut [19], washer [18], washer [17], bushing [16], bushing [15], washer [14], and
bolt [13] to that attach the power control unit [4] to the airplane structure.
(c) Remove the power control unit [4] from the airplane.
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Standby Rudder Power Control Unit Installation
Figure 401 (Sheet 1 of 2)/27-21-24-990-801
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Standby Rudder Power Control Unit Installation
Figure 401 (Sheet 2 of 2)/27-21-24-990-801
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TASK 27-21-24-400-801
　
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