S 862-058
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 OR DAMAGE TO EQUIPMENT.
(3)
Supply hydraulic power to hydraulic system No. 1, 2, and 3.
S 862-066
(4)
Set the FLT CONTROL HYD POWER TAIL 1, 2, 3, and 4 switches to the NORM position. These switches are on the Pilots' Overhead Maintenance Panel, P461.
D. RPCP Electrohydraulic Servovalve and Solenoid Valve Test
S 742-063
(1)
Do this task: Ground Test - Rudder Servo (AMM 22-10-00/501).
S 862-064
(2)
Remove hydraulic power.
S 792-055
(3)
Do this leak check:
(a)
Set the FLT CONTROL HYD POWER TAIL 1, 2, 3, and 4 to the SHUTOFF position. These switches are on the Pilots' Overhead Maintenance Panel, P461.
(b)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
1) P180, DC Power Distribution Panel a) 180E7, ELEV/RUD VLV SYS 2 b) 180E22, ELEV/RUD VLV SYS 4 c) 180H8, ELEV/RUD VLV SYS 1 d) 180H23, ELEV/RUD VLV SYS 3
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747-400 MAINTENANCE MANUAL
(c)
Visually examine the RPCP to make sure that there are no hydraulic leaks.
(d)
Make the correction if it is necessary.
E. Put the Airplanes Back to Its Initial Condition
S 862-052
(1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P180, DC Power Distribution Panel
1) 180E7, ELEV/RUD VLV SYS 2
2) 180E22, ELEV/RUD VLV SYS 4
3) 180H8, ELEV/RUD VLV SYS 1
4) 180H23, ELEV/RUD VLV SYS 3
S 412-062
(2)
Install the access panel 324EL, 324EL, and 324FR (AMM 06-09-07/201).
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 862-051
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747-400 MAINTENANCE MANUAL
LATERAL AUTOPILOT SERVO FILTER - REMOVAL/INSTALLATION
_____________________________________________________
1. General
_______
A. This procedure contains two tasks. The first task is the removal of the filter from the Lateral Autopilot Servo (LAS). The second task is the installation of the filter on the LAS.
B. You can find the Lateral Autopilot Servo in the left wing gear wheel well, adjacent to the Central Lateral Control Package (CLCP) - right autopilot.
TASK 22-13-06-004-042
2. Lateral Autopilot Servo Filter Removal (Fig.______________________________________401)
A. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 20-11-19/401, O-Ring
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 29-11-00/201, Main Hydraulic Supply System
(5)
AMM 32-00-30/201, Landing Gear Door Locks
B. Access
(1) Location Zone
135 Left Wing Landing Gear Well
C. Prepare for the Lateral Autopilot Servo Filter Removal
S 494-073
WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Install the ground locks in all landing gear (AMM 09-11-00/201).
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