(b)
Turn the outer nut of the gas charging valve one turn
counterclockwise.
(c)
With a value for the ambient temperature of the airplane, find the correct charge pressure for the accumulator.
(d)
Look at the pressure indication on the direct reading pressure gage adjacent to the mainfold assembly.
(e)
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.
(f)
Turn the outer nut of the gas charging valve clockwise until it is tight.
(g)
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.
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747-400 MAINTENANCE MANUAL
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.
(h) Disconnect the nitorgen or dry air source from the stem of the
gas charging valve.
(i) Install the cap on the stem of the gas charging valve.
(j) Turn the outer nut of the gas charging valve clockwise until it
is tight.
S 864-033
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(6)
Pressurize hydraulic system 4 (AMM 29-11-00/201).
S 864-042
(7)
Set the parking brake.
S 784-043
(8)
Make sure the pressure indication on the direct reading pressure gage is 3000 | 200 psi.
S 784-044
(9)
Remove the power from hydraulic system 4 (AMM 29-11-00/201).
S 794-046
(10)
While the parking brake is set, make sure the pressure in the hydraulic brake accumulator stays near the initial 3000 | 200 psi.
NOTE: Use the direct reading pressure gage for an indication of
____ pressure in the hydraulic brake accumulator.
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S 794-047
(11)
While the parking brake is set, listen and feel for gas leaks at the pressure gage.
S 714-022
(12)
Do this sequence of steps to do a check of the pressure transmitter:
(a)
Make sure the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1, is 3000 | 200 psi.
(b)
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Repeat this cycle six times.
(c)
Make sure the pressure indication of the HYD BRAKE PRESS gage decreases during manual brake operation.
G.
Put the Airplane Back to Its Usual Condition
S 094-035
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.
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