(b)
Tighten the smaller nut to 450-590 pound-inches (51-67 newton-meters).
(3) Install the bolt assembly, two washers and two nuts to connect the rod assembly to the rudder.
NOTE: You must install the nuts, washers, and bolt assembly as shown in figure 401 view B-B 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)
Tighten the larger nut to 300-400 pound-inches (34-45 newton-meters).
(b)
Tighten the smaller nut to 450-590 pound-inches (51-67 newton-meters).
CAUTION: MAKE SURE YOU CORRECTLY INSTALL THE HYDRAULIC LINES PCU. MAKE SURE THE CORRECT UNIONS ARE INSTALLED IN THE HYDRAULIC PORTS OR YOU CAN CAUSE DAMAGE TO THE PCU.
C. Connect the hydraulic lines:
(1)
If the PCU does not have the unions and reducer fittings installed, apply the hydraulic fluid or the assembly lube to the unions and reducer fittings and install them in the hydraulic ports.
(2)
Connect the hydraulic lines to the PCU.
D. Connect the electrical connectors to the PCU.
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27-21-92 Page 406 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/03
E. Install the control rods:
NOTE: For easier adjustment of the control rods, install the adjustment ends in the forward position.
(a) Before you install the control rods, make sure that they are at the correct lengths:
(1)
Loosen the clamp nuts on the rods.
(2)
Rotate the extension as necessary to get the length between the centers of the rod end to approximately 27.38 inches (695.5 millimeters).
(3)
Lightly tighten the clamp nut.
NOTE: Do not tighten too hard. You will have to loosen the clamp nuts for the adjustment of the control rods.
(b)
Connect control rods to the external summing levers:
(1)
Install the bolts, washers, washers, and nuts.
(2)
Tighten the nuts to 100-150 pound-inches (11.3-16.9 newton-meters).
(c)
Connect the forward end of the control rods to the input cranks:
(1)
Install the bolts, washers, washers, and nuts.
(2)
Tighten the nuts to 100-150 pound-inches (11.3-16.9newton-meters).
F. Install the lockout pin on the nose gear steering (AMM 32-00-01/201).
NOTE: It is not necessary to disconnect the steering if the airplane is on jack and the nose landing gear is fully extended.
G. Remove the DO-NOT-CLOSE tags and close the YAW DAMPER circuit breakers on the P6 panel.
H. Supply the rudder systems A and B hydraulic power (AMM 27-21-0/201).
I. Move the rudder pedals to bleed the rudder PCU until the movement of the rudder is smooth.
J. Examine the hydraulic connections for leakage.
K. Do the steps to adjust the input rods to the main PCU and Standby PCU (AMM 27-21-1/501).
L. Do the Rudder Main PCU Force Fight Monitor Test (AMM 27-21-1/501).
M. Do the Main Rudder PCU Internal Hydraulic Leakage Test (AMM 29-00/601).
N. Do the Rudder Pedal Forces Test (AMM 27-21-1/501).
O. Do the Rudder Hinge and Bearing Play of the Power Control Unit (AMM 27-21-1/501).
P. Do the Rudder Centering Test (AMM 27-21-1/501).
Q. Do the Rudder Travel Test (AMM 27-21-1/501)
May 01/03 27-21-92 Page 407 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
6. Load Limiter Solenoid Valve Removal (Fig. 402)
A. Remove rudder systems A, B, and Standby hydraulic power (AMM 27-21-0/201).
B. Remove lower section of rudder hinge cover and seal from the right side.
C. Open the YAW DAMPER circuit breakers on P6 and attach the DO-NOT-CLOSE tags.
D. Remove the Solenoid Valve:
(1)
Remove the bolts that attach the solenoid valve to the main rudder PCU.
(2)
Remove the seal plate.
(3)
Remove the O-ring. Discard the O-ring.
(4)
Remove the solenoid valve.
(5)
Put plugs on the main rudder PCU ports.
7. Load Limiter Solenoid Valve Installation (Fig. 402)
A. Remove rudder systems A, B, and Standby hydraulic power (AMM 27-21-0/201).
B. Install the Solenoid Valve:
(1)
Remove the plugs on the main rudder PCU ports.
(2)
Clean the seal plate
(3)
Lubricate the new O-ring with hydraulic fluid.
(4)
Install the new O-ring.
(5)
Install the seal plate.
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