(f)
Do this test of the oxygen system: Oxygen System Operational Test (AMM 35-21-00/501).
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A 747-400 MAINTENANCE MANUAL
(g) (h) To make sure that the pressure shows on the EICAS status page, do this task: "Crew Oxygen Pressure Indication Test" (AMM 35-11-00/501).Close the access door to the crew oxygen cylinder.
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747-400 MAINTENANCE MANUAL
HYDRAULIC BRAKE ACCUMULATOR - SERVICING (GASEOUS)
_________________________________________________
1. General_______
A. This procedure contains a task to check the Hydraulic Brake Accumulator precharge and a procedure to increase the precharge pressure. You must charge the accumulator with nitrogen or dry air to service it.
B. Use the charging instructions marker adjacent to the manifold assembly to find the correct accumulator charge pressure for a given temperature.
C. Use the direct reading pressure gage adjacent to the accumulator for indication of accumulator pressure.
TASK 12-15-09-603-017
2. Check of the Preload on the Hydraulic Brake Accumulator_______________________________________________________
A. General
(1) In subsequent steps, the hydraulic brake accumulator is referred to as the accumulator.
B. Consumable Materials
(1)
G01158 Nitrogen
(2)
If nitrogen is not available,
Source of Clean Dry Air, maximum moisture
content corresponding to an atmospheric dew
point of -20 degrees F (-29 degrees C).
C. 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
D. Access
(1) Location Zone
138 Body Landing Gear Well - Right
E. Prepare for the Servicing
S 863-001
(1)
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
(2)
Make sure the wheel chocks are installed.
(3)
If necessary, release the parking brake.
S 863-002
S 863-003
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747-400 MAINTENANCE MANUAL
S 493-016
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.
(4)
Do this task: "Installation of the Door Locks on the Wing Landing Gear (AMM 32-00-30/201).
S 493-023
(5)
Do this task: "Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).
S 843-005
(6)
Remove the pressure from Hydraulic Systems No. 1, 2, and 4
"Hydraulic System Depressurization" (AMM 29-11-00/201).
(a)
Supply electrical power (AMM 24-22-00/201).
(b)
Release the pressure in the pneumatic system
(AMM 36-00-00/201).
(c)
Open the fairing doors on the trailing edge of the strut.
(d)
Operate the bleed valve on the reservoir pressurization module to release the pressure in the reservoir.
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