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 B.  The removal and the installation of the ADP is the same for systems 1 and 4.
 C.  The ADP is on the aft side of the torque box in the aft nacelle strut. The pump is attached to the lower side of the ADP turbine drive. You can get access to the ADP through the fairing doors on the trailing edge of the strut.
 D.  If you replace an air-driven pump (ADP) for one of the conditions which follow, refer to AMM 29-11-00/201 for the procedure which is necessary to flush the system or replace the filters.
 (1)  
Mechanical failure

 (2)  
Leakage at the shaft or housing seal

 (3)  
The ADP became too hot.

 TASK 29-11-17-004-001
 2.  Air-Driven Pump (ADP) Removal (Fig. 401)_____________________________
 A.  Standard Tools and Equipment
 (1)
Container - 1 Gallon (4 liter) Capacity (For hydraulic fluid)

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 C.  
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel
 454A Trailing Edge Fairing Doors - System 1
 484A Trailing Edge Fairing Doors - System 4

 D.  
Procedure

 S 014-002
 (1)  
Open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 864-004

 (3)  
Put the applicable HYD DEMAND switch on the P5 panel in the OFF position.

 S 864-003
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A

747-400
MAINTENANCE MANUAL

AIR-DRIVEN PUMP
SEE A
2.  DRAIN TUBE FOR THE SHAFT SEAL
TURBINE
3.  NUTDRIVE (4 LOCATIONS)
SEE  B 
1. AIR-DRIVEN PUMP 
A 

4.  CASE DRAIN HOSE
B AC
6.  PRESSURE HOSE
5.  SUPPLY C
B
HOSE
FWD
AIR-DRIVEN PUMP (SYSTEM 1 IS SHOWN, TYPICAL)
A
Air-Driven Pump Installation Figure 401 (Sheet 1)
L28561
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PUMP SUPPLY PUMP PRESSURE
PORT PORT
B-B C-C
Air-Driven Pump Installation Figure 401 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
 S 864-005
 WARNING:_______ MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
 OPEN THE HYDRAULIC SYSTEM.  THE PNEUMATIC SYSTEM PRESSURIZES
 THE HYDRAULIC RESERVOIR.  HYDRAULIC FLUID THAT HAS PRESSURE CAN

 CAUSE INJURY TO PERSONS.
 (4)  
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 S 864-006

 (5)  
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 864-007

 (6)  
Open the 7J1 HYDRAULICS DEMAND 1 or the 7F1 HYDRAULICS DEMAND 4 circuit breaker on the P7 circuit breaker panel for the applicable system.

 S 034-008

 (7)  
Disconnect the hydraulic lines:

 (a)  
Put the container below the ADP (1).
　
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