S 032-059
(8)
Remove the lockwire from the mounting screws (5) (Ref 20-11-28/401).
S 022-060
(9)
Do the steps that follow to remove the EAS valve:
(a)
Hold the valve (2 or 3) and remove the mounting screws (5) and washers (6).
(b)
Remove the valve (2 or 3) from the EAS.
(c)
Remove the gasket plate (4) from the EAS (1).
(d)
Remove the O-ring (7) from the valve (2 or 3)
(Ref 20-11-19/401).
S 032-061
(10) Install the covers on the EAS (1) openings to prevent the hydraulic ports from the contamination.
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747-400 MAINTENANCE MANUAL
TASK 22-12-02-402-064
3. Install The EAS Electrohydraulic Servovalve and the Solenoid Valve (Fig. 201)
__________________________________________________________________
A. Standard Tools and Equipment
(1)
Bonding Meter - Autron T477W
(2)
O-ring Installation Tool ST848
(3)
Torque Wrench - Commercially available
B. Consumable Materials
(1)
G00062 Fluid - Hydraulic, Fire Resistant, BMS 10-11
(2)
D00054 Lubricant - Assembly, Skydrol, MCS352
(3)
D00013 Grease - MIL G-23827
C. 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)
20-22-01/601, Electrical Bonding
(5)
22-10-00/501, Autopilot/Flight Director System
(6)
24-22-00/201, Manual Control
(7)
29-11-00/201, Main Hydraulic Supply System
D. 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
E. Install the EAS Electrohydraulic Servovalve and Solenoid Valve
S 862-062
(1) Supply the electrical power (Ref 24-22-00/201).
S 862-063
WARNING: MAKE SURE THAT YOU MOVE PERSONS AND BLOCKAGES AWAY FROM THE
_______ CONTROL SURFACES. THE CONTROL SURFACES CAN MOVE SUDDENLY WHEN YOU APPLY THE HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) Make sure that you 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
S 862-082
(3) Make sure that the No. 1, 2, 3, and 4 switches of the FLT CONTROL SHUTOFF TAIL VALVE are in the SHUTOFF position. The switches are on the Pilots' Overhead Maintenance Panel, P461.
S 862-084
(4) Make sure that the No. 1 and 2 switches of the STAB TRIM hydraulic are in the CUTOUT position and the DO-NOT-OPERATE tags are attached. The switches are on the Pilots' Control Stand.
S 862-057
(5) Make sure that these circuit breakers are open and the DO-NOT-CLOSE tags are attached: (a) P7 Overhead Circuit Breaker Panel 1) 7D7, FLT CONT CMPTR L SERVO 2) 7D8, FLT CONT CMPTR L PWR 3) 7D12, FLT CONT CMPTR C SERVO 4) 7D13, FLT CONT CMPTR C PWR 5) 7D14, FLT CONT CMPTR R SERVO 6) 7D15, FLT CONT CMPTR R PWR 7) 7E7, STAB TRIM L S/O VALVE 8) 7E20, STAB TRIM R S/O VALVE (b) 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
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