S 864-062
 (10)
 Pressurize the reservoir fill filter with the hand pump (AMM 12-12-01/301).

 S 214-063

 (11)
 Examine the reservoir fill filter for leakage.

 S 864-039

 (12)
 Release the pressure in the pneumatic system (AMM 36-00-00/201).

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A
747-400 MAINTENANCE MANUAL
 S 094-064
 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
 DOOR LOCKS ON THE LANDING GEAR DOORS.  THE DOORS CAN CLOSE
 QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY.  THIS

 CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (13)
 Do this task:  Body Landing Gear Door Lock Removal (AMM 32-00-30/201).

 S 864-041

 (14)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

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A

747-400 FAULT ISOLATION/MAINT MANUAL
P5 P7 PANEL PANEL

HYD PUMPS DEMAND PRESS LIGHT, L4
AUXILIARY PUMP CONTROL SWITCH, S8
HYDRAULIC CONTROL MODULE, M7316 (REF)

Auxiliary AC Hydraulic System - Component Location
Figure 101 (Sheet 1)

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A

747-400
FAULT ISOLATION/MAINT MANUAL

MAIN EQUIPMENT CENTER
SEE B
E2 RACK (REF)
P714 PANEL
E1 RACK (REF)
P414 PANEL
ACCESS
HATCH,
117AL

NOSE GEAR
WHEEL WELL

FWD (REF)
MAIN E/E EQUIPMENT CENTER
B
Auxiliary AC Hydraulic Systems - Component Location Figure 101 (Sheet 2)
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A

747-400
FAULT ISOLATION/MAINT MANUAL

ENGINE 
NACELLE 
STRUT 
FWD 
FILTERS 
SEE  C 
PUMPS 
CASE DRAIN  SEE  D 
MODULE 
AIR-DRIVEN 
PUMP (REF) 
AUXILIARY PUMP 
CASE DRAIN  FWD 
FILTER 
FILTERS 
AUXILIARY 
C  HYDRAULIC PUMP 

FWD
PUMPS (RIGHT SIDE SHOWN)
D
Auxiliary AC Hydraulic System - Component Location Figure 101 (Sheet 3)
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 1.

2.

3.

4.

A
747-400 MAINTENANCE MANUAL
 AUXILIARY AC HYDRAULIC SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________________
General
_______
 A.  The auxiliary hydraulic system supplies hydraulic power for the brakes on the airplane while it is towed. The system has an auxiliary hydraulic pump, auxiliary pump case drain filter, and a demand pump switch in the flight compartment.
　
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