(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. Remove the EAS Electrohydraulic Servovalve and Solenoid Valve
S 862-052
(1) Supply the electrical power (Ref 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
EAS (3 PLACES)
SEE A
ACCESS
PANEL
315A
1. SERVO ASSEMBLY
7. O-RINGS
ELECTRICAL CONNECTOR
4. GASKET PLATE
2. SOLENOID VALVE 2 (ENGAGE)
2. SOLENOID VALVE 1 (ARM)
6. WASHER
5. SCREWS
3. ELECTROHYDRAULIC (4 EACH
(4 EACH
SERVOVALVE
VALVE)
VALVE)
A
EAS Electrohydraulic Servovalve and Solenoid Valves Installation Figure 201
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747-400 MAINTENANCE MANUAL
S 862-053
WARNING:_______ MAKE SURE THAT YOU MOVE PERSONS AND BLOCKAGES AWAY FROM THE
CONTROL SURFACES. THE 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.
S 862-054
(3)
Set the No. 1, 2, 3, and 4 switches of the FLT CONTROL SHUTOFF TAIL VALVE to the SHUTOFF position. The switches are on the Pilots' Overhead Maintenance Panel, P461.
S 862-083
(4)
Set the No. 1 and 2 switches of the STAB TRIM hydraulic to the CUTOFF position and attach the DO-NOT-OPERATE tags. The switches are on the Pilots' Control Stand.
S 862-085
(5)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(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
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747-400 MAINTENANCE MANUAL
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
S 012-057
(6) Open the 315A access door in the tail cone to get access to the EASs (Ref 06-09-05/201).
S 162-087
CAUTION: DO NOT LET THE CONTAMINATION GET INTO THE EAS AND THE VALVES.
_______ THE EAS AND THE VALVES ARE SENSITIVE ELECTROHYDRAULIC DEVICES. THE CONTAMINATION CAN CAUSE DAMAGE AND FAILURE TO THE EAS AND THE VALVES.
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