S 614-013
(2)
Do the servicing procedure for the hydraulic pressure surge accumulator (AMM 12-15-11/301).
(3)
Pressurize the hydraulic system 4 (AMM 29-11-00/201).
(4)
Push in on the brake pedals two times.
(5)
Look for leaks at the pressure gage and tube fittings.
(6)
Set the parking brake.
S 864-014
S 864-015
S 794-016
S 864-017
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 944-018
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 THERE IS PRESSURE IN THE HYDRAULIC SYSTEM. THIS CAN
CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(7) Remove the door locks from the doors for the wing and the body landing gear (AMM 32-00-30/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
ALTERNATE BRAKE RETURN VALVE - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The removal of the alternate brake return valve.
(2)
The installation of the alternate brake return valve.
B.
An operational test for the alternate brake return valve is included as part of the installation task.
TASK 32-41-25-004-001
2. Alternate Brake Return Valve - Removal (Fig. 401)______________________________________
A. General
(1)
In subsequent steps, the alternate brake return valve is referred to as the return valve.
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 32-00-30/201, Landing Gear Door Locks
C.
Access
(1)
Location Zones
138 Body Landing Gear Well - Right
221 Control Cabin, LH
222 Control Cabin, RH
D.
Prepare for Removal
S 494-023
(1)
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
(2)
Make sure the wheel chocks are installed.
S 494-024
S 494-004
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3) Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
ALTERNATE BRAKE RETURN VALVE INSTALLATION
SEE A
KEEL BEAM IN THE RIGHT BODY GEAR WHEEL WELL O-RING
BACKUP RING
O-RING
ALTERNATE BRAKE RETURN VALVE
SUPPORT BRACKET
A
HYDRAULIC
LINE
ADAPTER BOLT (3 LOCATIONS)
WASHER (3 LOCATIONS)
ADAPTER
O-RING
HYDRAULIC LINE
BACKUP RING
O-RING
BACKUP RING
O-RING
ADAPTER
HYDRAULIC LINE
Alternate Brake Return Valve Installation
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