S 865-013
(12)
Put the HYD PUMPS DEMAND switch in the ON position.
(a)
Make sure the HYD PUMPS DEMAND PRESS light goes off.
S 865-014
(13)
When the system pressure becomes stable at approximately 3000 psi, put the HYD PUMPS DEMAND switch in the AUX position.
(a)
Make sure there is no flow of current to the auxiliary pump.
S 975-027
(14)
Monitor the system pressure, the ammeter, and the HYD PUMPS DEMAND PRESS light while the system pressure decreases.
S 215-015
(15)
Make sure the flow of current to the auxiliary pump starts at approximately the same time that the HYD PUMPS DEMAND PRESS light comes on.
NOTE: You can put the FLIGHT CONTROL SHUTOFF VALVE switches, on the
____ overhead maintenance panel, P461, in the OFF position to make the system pressure decrease slowly.
S 865-016
(16)
Put the HYD PUMPS DEMAND switch in the OFF position.
S 085-017
(17)
Remove the ammeter from the wire of the auxiliary pump.
S 865-018
(18)
Release the pressure in the pneumatic system if it is not necessary (AMM 36-00-00/201).
S 865-019
(19)
Release the pressure in the hydraulic system if it is not necessary (AMM 29-11-00/201).
(20)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-020
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A
747-400 MAINTENANCE MANUAL
S 215-024
(21)
Examine the doors on the trailing edge fairing:
(a)
Examine the latches on the doors in the trailing edge fairing for cracks and wear.
(b)
Make sure that all latches are there.
(c)
Repair and adjust the latches if it is necessary
(AMM 54-62-02/501).
S 415-025
CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
(22) Close the doors in the trailing edge fairing (AMM 54-62-00/201).
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A
747-400 MAINTENANCE MANUAL
AUXILIARY AC MOTOR-DRIVEN HYDRAULIC PUMP - REMOVAL/INSTALLATION
_______________________________________________________________
1. General_______
A. This procedure has two tasks. The first task removes the auxiliary AC motor-driven hydraulic pump (referred to as the hydraulic pump) The second task installs the hydraulic pump. The second task also does a test of the hydraulic pump.
B. The hydraulic pump is on the aft side of the torque box in the nacelle struts for the No. 1 and No. 4 engines. The pump is attached to a bracket that also holds the turbine drive for the air-driven pump. You must open the doors in the trailing edge fairing to get access to the hydraulic pump.
TASK 29-21-01-004-001
2. Auxiliary AC Motor-Driven Hydraulic Pump Removal (Fig. 401)________________________________________________
A. Standard Tools and Equipment
(1)
Container - For Hydraulic Fluid, 1 gallon (4 liter) Capacity
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 Strut Aft Fairing
484 Strut Aft Fairing
(2)
Access Panel 454A Trailing Edge Fairing Doors - System 1 484A Trailing Edge Fairing Doors - System 4
D.
Procedure
(1)
Open the doors in the trailing edge fairing (AMM 54-62-00/201).
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