(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. 3) Make sure the indication of the HYD BRAKE PRESS gage does
not decrease when you push the brake pedals down.
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747-400 MAINTENANCE MANUAL
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 is 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.
S 864-031
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.
(11)
Pressurize hydraulic system 4 (AMM 29-11-00/201).
S 794-018
(12)
After at least two minutes with hydraulic system 4 pressurized, look for leaks at the accumulator.
S 864-019
(13)
Do this sequence of steps six times to bleed any small quantities of air from the hydraulic system:
(a)
Slowly push one set of brake pedals to the limit of travel to fully operate the brakes.
(b)
Hold these brake pedals in this position momentarily.
(c)
Slowly release the brake pedals. Stop for ten seconds before you operate the brakes again.
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S 784-020
(14)
Make sure the pressure indication of the HYD BRAKE PRESS gage, on the P1 panel, shows 3000 | 200 psi.
S 714-021
(15)
Do a check of brake operation as follows:
(a)
Slowly push one set of brake pedals to the limit of travel.
(b)
Make sure the brakes operate when you push down on a set of brake pedals.
NOTE: Look for movement at the pistons of a brake unit for an
____ indication of brake operation.
S 864-023
(16)
Remove the power from hydraulic system 4 (AMM 29-11-00/201).
S 614-052
(17)
Do a check of the fluid level in the reservoir for hydraulic system 4.
(a)
Fill up the reservoir to the correct level if the fluid level is low (AMM 12-12-01/301).
G.
Put the Airplane Back to Its Usual Condition
S 094-032
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: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).
S 094-033
(2)
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).
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