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747-400 MAINTENANCE MANUAL
 S 864-046
 (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 864-047

 (4)  
Set the No. 1 and 2 switches of the STAB TRIM hydraulic to the CUTOUT position and attach the DO-NOT-OPERATE tags. The switches are on the Pilots' Control Stand.

 S 864-048

 (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
 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 014-091
 (6)  Open the 315A access door in the tail cone to get access to the EASs (Ref 06-09-05/201).
 D. Remove the EAS Filter
 S 164-056
 CAUTION: DO NOT LET THE CONTAMINATION GET INTO THE EAS AND THE FILTER.
_______ THE EAS AND THE FILTER ARE SENSITIVE DEVICES. THE CONTAMINATION CAN CAUSE DAMAGE AND FAILURE TO THE EAS AND THE FILTER.
 (1)  Fully clean the area around the hydraulic pressure port (the nearest port to the crank arm) on the EAS.
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747-400 MAINTENANCE MANUAL
 S 864-057
 (2)  
Disconnect the hydraulic pressure port.

 S 024-093

 (3)  
Do the steps that follow to remove the filter:

 (a)  
Remove the reducer (2) and the O-ring (3) (Ref 20-11-19/401) from the EAS (1). Discard the O-ring.

 (b)  
Remove the filter element (4) from the EAS (1).

 (c)  
Install the reducer (2) back to the EAS pressure port, tighten the reducer by hand.

 S 034-061
 (4)  Install the covers on the EAS opening and the hydraulic line to prevent from the contamination.
 TASK 22-12-03-404-062
 3.  Install The EAS Filter (Fig. 401)______________________
 A. Standard Tools and Equipment
 (1)  
O-ring Installation Tool, ST848

 (2)  
Torque Wrench - Commercially available

 B. Consumable Materials
 (1)  
G00062 Fluid - Hydraulic, Fire Resistant, BMS 10-11

 (2)  
D00054 Lubricant - Assembly, Skydrol, MCS352

 C. References
 (1)  
06-09-05/201, Body Section 48 Acess Doors and Panels

 (2)  
20-11-19/401, O-Ring

 (3)  
20-11-28/401, Lockwire

 (4)  
22-10-00/501, Autopilot/Flight Director System

 (5)  
24-22-00/201, Manual Control

 (6)  
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
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747-400 MAINTENANCE MANUAL
 (2)  Access Panel
 315A Access Door

 E. Prepare for the Installation
 S 864-080
 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.
　
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