(3)  
24-22-00/201, Manual Control

 (4)  
29-11-00/201, Main Hydraulic Supply System

 (5)  
IPC 27-23-01 Fig. 1

 C.  
Access

 (1)  
Location Zone
 311 Area Aft of Pressure Bulkhead, LH
 312 Area Aft of Pressure Bulkhead, RH

 (2)  
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door

 D.  
Prepare for the Removal

 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-003

 (2)  
Find the switches for the FLT CONTROL HYD POWER on the pilot's overhead maintenance panel, P461.

 (a)
Put the four TAIL switches in the SHUTOFF position.

 S 864-002
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A

747-400
MAINTENANCE MANUAL

SEE  A  HORIZONTAL STABILIZER 
3  JACKSCREW 

SEE 4  A  SEE 1  A 
SEE 2  A 
1. NUT (2)  2. WASHER (2) 3. BOLT (2) 
10. BRACKET 
9. HYDRAULIC LINE SUPPORT  4. SHUTOFF VALVE 
1. NUT  ELECTRICAL CONNECTORS 
5. PACKING 
3. BOLT 2. WASHER  6. O-RING 7. PACKING 
8. ADAPTER 
HYDRAULIC LINES 
SHUTOFF VALVE (EXAMPLE) 
1 2 3 4  INBOARD ELEVATOR THAT USE HYDRAULIC SYSTEM NO. 2. AND LEFT INBOARD ELEVATORS THAT USE HYDRAULIC AND RIGHT INBOARD ELEVATORS THAT USE SHUTOFF VALVE FOR THE LOWER RUDDER, RIGHT OUTBOARD INBOARD ELEVATOR THAT USE HYDRAULIC SYSTEM NO. 3. SHUTOFF VALVE FOR THE UPPER RUDDER AND RIGHT SHUTOFF VALVE FOR THE LOWER RUDDER AND LEFT SHUTOFF VALVE FOR THE UPPER RUDDER, LEFT OUTBOARD SYSTEM NO. 1. HYDRAULIC SYSTEM NO. 4.  A 

Shutoff Valve Installation
Figure 401

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A
747-400 MAINTENANCE MANUAL
 S 864-005
 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180, DC Power Distribution Panel
 1) 180H8 ELEV/RUD VLV SYS 1
 2) 180E7 ELEV/RUD VLV SYS 2
 3) 180H23 ELEV/RUD VLV SYS 3
 4) 180E22 ELEV/RUD VLV SYS 4

 S 864-006
 (4)  
Remove pressure from the applicable hydraulic system
 (Ref 29-11-00/201).

 S 014-007

 (5)  
Open the access door, 312A, for the stabilizer jackscrew
 compartment.

 E.
Procedure

 S 034-030
 (1)  
Disconnect the electrical connectors from the applicable shutoff valve.

 (a)  
Hydraulic system No. 1:
 1) DV142A
 2) DV142B

 (b)  
Hydraulic system No. 2:
 1) DV143A
 2) DV143B

 (c)  
Hydraulic system No. 3:
 1) DV147A
 2) DV147B

 (d)  
Hydraulic system No. 4:
 1) DV150A
 2) DV150B

 S 034-031
 (2)  Disconnect the hydraulic lines from the shutoff valve.
 NOTE: Use a bucket to catch the hydraulic fluid from the
____
 hydraulic lines.

 S 034-032
 (3)  
Put caps on the hydraulic lines and ports.

 S 024-033

 (4)  
Remove the two bolts (3), washers (2), and nuts (1) that attach the shutoff valve (4) to the bracket (10).

 S 024-034

 (5)  
Remove the bolt (3), the washer (2), and the nut (1) from the hydraulic line support (9).

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 27-23-01
　
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