(2)
The removal of the hydraulic lines
(3)
The removal of the PCA.
C.
The PCA installation tasks have these parts:
(1)
A check of the PCA for worn areas
(2)
The installation of the PCA
(3)
The installation of the hydraulic lines
(4)
The return of the airplane to its usual condition.
(5)
An operational test of the PCA
D.
Do not remove more than one power control actuator at the same time, unless you install a rudder actuator lock (G27008).
NOTE: Remove the rudder clamp when you install the rudder actuator lock.
____ You only need one rudder actuator lock when more than one actuator is removed.
TASK 27-21-15-844-055
2. Prepare for the Removal of the Power Control Actuator (PCA)___________________________________________________________
A. General
(1)
You must use this procedure to prepare the airplane for the removal of the actuators for the upper rudder.
B.
Special Tools and Equipment
(1)
3ME65B81000-1 Rudder Clamp
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A
747-400
MAINTENANCE MANUAL
(2)
2MIT65B04011-41, Safety - Nose Gear Rig and Tow Pin
C.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
D.
Access
(1)
Location Zone
324 Vertical Stabilizer, Rear Spar to Trailing Edge
326 Upper Rudder
(2)
Access Panel
324DL Inspection Access Panel
324DR Rudder Actuator Access Panel
324HL Inspection Access Panel
324HR Centering Mechanism Access Panel
324UL Inspection Access Panel
324UR Inspection Access Panel
E.
Procedure
S 494-056
WARNING:_______MAKE SURE THE NOSE WHEELS POINT FORWARD. IF THE NOSE WHEELS DO NOT POINT FORWARD, THE NOSE GEAR CAN QUICKLY TURN TO THE CENTERED POSITION WHEN YOU REMOVE THE TOW PIN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Install the TOW PIN at the steering metering valve for the nose landing gear (AMM 09-11-00/201).
NOTE: The nose gear will turn during the rudder operation if you
____
do not install the TOW PIN.
S 864-057
(2) Supply the electrical power (AMM 24-22-00/201).
S 864-058
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Supply No. 1 and 4 hydraulic power to the system (AMM 29-11-00/201).
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A
747-400 MAINTENANCE MANUAL
S 864-059
CAUTION:_______ MOVE THE RUDDER PEDALS SLOWLY AND SMOOTHLY. THE MINIMUM TIME
TO MOVE THE RUDDER THROUGH A FULL CYCLE IS 8 SECONDS. IF YOU
MOVE THE RUDDER TOO QUICKLY, THE POWER CONTROL PACKAGE CAN BE
DAMAGED.
(4)
Push the captain's left rudder pedal forward and hold in position.
(a)
Make sure the rudder travels to the full left position.
S 494-060
(5)
Lock the left rudder pedal in that position.
S 494-061
(6)
Install the rudder clamp between the upper and the lower rudder approximately two inches from the trailing edge.
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