(f)
Make sure that no fault message shows for the channel that you engage.
NOTE: Fault messages (ENGAGE FAIL) shown for the other
____ channels that you did not engage are permitted.
(g)
Continue with the instructions on the CDU to complete the test.
(h)
Make sure that the SERVO-ELEVATOR test is completed with no failure for the applicable FCC.
NOTE: An autopilot disconnect warning will occur at the end of
____
this test, which is permitted.
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A 747-400 MAINTENANCE MANUAL
(i) Push the captain's or first officer's autopilot disconnect switch two times.
(5) S 862-079Remove hydraulic power (Ref 29-11-00/201).
(6) S 792-080Visually examine the valves and make sure that there are no hydraulic leaks.
(7) S 412-072Close the 315A access door in the tail cone (Ref 06-09-05/201).
(8) S 862-081Remove the electrical power if it is not necessary (Ref 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
ELEVATOR AUTOPILOT SERVO FILTER - REMOVAL/INSTALLATION
______________________________________________________
1. General
_______
A. This procedure contains two tasks. The first task is for the removal of the Elevator Autopilot Servo (EAS) filter. The second task is for the installation of the EAS filter.
B. You can find the three EASs on the aft side of the stabilizer hinge bulkhead. You can get access to the EASs through the 315A access door in the tail cone.
TASK 22-12-03-004-043
2. Remove The EAS Filter (Fig. 401)
_____________________
A. References
(1)
06-09-05/201, Body Section 48 Access Doors and Panels
(2)
20-11-19/401, O-Ring
(3)
20-11-28/401, Lockwire
(4)
24-22-00/201, Manual Control
(5)
29-11-00/201, Main Hydraulic Supply System
B. Access
(1)
Location Zones 315 Area Aft of Stabilizer Box Compartment, LH 316 Area Aft of Stabilizer Box Compartment, RH
(2)
Access Panel
315A Access Door
C. Prepare for the Removal
S 864-044
(1) Supply the electrical power (Ref 24-22-00/201).
S 864-045
WARNING: MAKE SURE THAT YOU MOVE PERSONS AND EQUIPMENT AWAY FROM THE
_______ CONTROL SURFACES. THESE CONTROL SURFACES CAN MOVE SUDDENLY WHEN YOU REMOVE THE HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) Remove the hydraulic pressure from the applicable hydraulic system (Ref 29-11-00/201).
NOTE: The hydraulic system No. 1 supplies the power to the
____ center EAS. The hydraulic system No. 2 supplies the power to the right EAS. The hydraulic system No. 3 supplies the power to the left EAS.
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747-400 MAINTENANCE MANUAL
EAS (3 PLACES)
SEE A
ACCESS PANEL 315A
1. ASSEMBLY SERVO
HYDRAULIC RETURN (REF) REDUCER O-RING FILTER HYDRAULIC PRESSURE (REF) 2. 3. 4.
TYPICAL EAS A
Figure 401 EAS Filter Installation
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