(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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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