B.
References

 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

 (2)  
AMM 06-09-08/201, Wing Access Doors and Panels Inboard of Inboard Engines

 (3)  
AMM 24-22-00/201, Manual Control

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

 (5)  
AIPC 27-41-04, Fig. 3

 (6)  
WDM 28-21-25

 (7)  
SSM 28-21-03

 C.
Access

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

 (2)  
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door 521CB Fueling Control Panel Access Door

 D.
Install the Fuel Switch

 S 424-041
 CAUTION: MAKE SURE YOU ADJUST THE FUEL SWITCH AWAY FROM THE STABILIZER
_______ CAM WHEN YOU INSTALL THE SWITCH. AN INTERFERENCE BETWEEN THE FUEL SWITCH AND THE STABILIZER CAM CAN CAUSE DAMAGE TO THE FUEL SWITCH WHEN YOU MOVE THE STABILIZER.
 (1)  
Install the fuel switch:

 (a)  
Install the fuel switch in the mounting bracket. 1) Install the locknut.

 NOTE: Do not tighten the locknut.
____
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A 747-400 MAINTENANCE MANUAL
 (2)  S 864-042Do this task:  "Supply Electrical Power" (AMM 24-22-00/201).
 (3)  S 864-043Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7, Overhead Circuit Breaker Panel 1) 7E7, L STAB TRIM S/O VLV 2) 7E20, R STAB TRIM S/O VLV
 S 864-044

 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 834-045

 (5)  
Move the fuel switch to a position where the clearance of the cam surface and the fuel switch roller is 0.03-0.06 inch.

 (a)  
Tighten the locknut.

 E.
Do the Operational Test of the Fuel Switch

 S 864-047
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P180, DC Power Distribution Panel
 1) 180B2, FUELING LIGHTS HOT

 (b)  
P414, Power Distribution Center - Left
 1) 414F22, LIGHT FUELING

 (2)  
Open the access door 521CB (AMM 06-09-08/201).

 S 414-048
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (3)  S 714-283Do this test of the fuel switch: (a) Use the STAB TRIM ALTN switches on the control stand to set the stabilizer at 5-7 units of trim. (b) Make sure the STAB POSITION light on the fueling control panel goes off. (c) Move the stabilizer to the neutral position (3 units of trim). (d) Make sure the STAB POSITION light comes on.
 (4)  S 014-050Close the access door 521CB (AMM 06-09-08/201).
 (5)  S 014-051Close the access door 312A (AMM 06-09-05/201).
 (6)  S 864-052If the electrical power is not necessary, do this task: Electrical Power" (AMM 24-22-00/201). "Remove
 (7)  S 864-053If the hydraulic power is not necessary, do this task: Hydraulic Power" (AMM 29-11-00/201). "Remove

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 27-41-08
　
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