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A
747-400 MAINTENANCE MANUAL
WARNING:_______DO NOT LOOSEN THE BODY OF THE GAS CHARGING VALVE. THE PRESSURE IN THE ACCUMULATOR CAN QUICKLY PUSH THE GAS CHARGING VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(c)
Turn the outer nut of the gas charging valve one turn counterclockwise.
(d)
Pressurize the accumulator to the correct pressure shown on the charging instructions marker.
NOTE: Use the direct reading pressure gage for indication of
____ the accumulator charge pressure.
(e)
Turn the outer nut of the gas charging valve clockwise until it is tight.
(f)
Do these steps to make sure that the accumulator charge pressure is satisfactory: 1) Look at the pressure indication of the HYD BRAKE PRESS
gage, on the P1 panel. 2) Slowly push one set of brake pedals to the limit of travel. 3) Make sure the indication of the HYD BRAKE PRESS gage does
not decrease when you push the brake pedals down.
4) If the indication of the HYD BRAKE PRESS gage decreases during brake operation, do the accumulator charging procedure again.
NOTE: Sometimes you must do the accumulator charging
____ procedure a second time. This is necessary when the initial accumulator charging was done without the accumulator completely empty of hydraulic fluid.
(g)
Disconnect the nitorgen or dry air source from the stem of the gas charging valve.
(h)
Install the cap on the stem of the gas charging valve.
F. Put the Airplane Back to Its Usual Condition
S 093-024
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do this task: "Remove the Door Locks from the Wing Gear"
(AMM 32-00-30/201).
S 093-021
(2)
Do this task: "Remove the Door Locks from the Body Gear"
(AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
S 843-019
(3) Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
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12-15-09
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747-400 MAINTENANCE MANUAL
HYDRAULIC PRESSURE SURGE ACCUMULATOR - SERVICING (GASEOUS)
__________________________________________________________
1. General_______
A. This procedure contains a task to service the hydraulic pressure surge accumulators. You must charge these accumulators with nitrogen or dry air to service them.
B. One hydraulic pressure surge accumulator is used for the brakes on each wing gear. One hydraulic pressure surge accumulator is used for the brakes on the two body gears. The surge accumulators for the wing gear brakes are installed in the wing, above and inboard of each wing gear trunion. The surge accumulator for the body gear brakes is installed on the keel beam in the right body gear wheel well.
TASK 12-15-11-603-012
2. Service the Hydraulic Pressure Surge Accumulators_________________________________________________
A. General
(1) In subsequent steps, the hydraulic pressure surge 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).
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