(e)  
Make sure the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1, shows 3000 | 200 psi.

 (f)  
Do this sequence of steps six times to bleed any small quantities of air from the hydraulic system: 1) Slowly push one set of brake pedals to the limit of travel

 to fully operate the brakes. 2) Hold these brake pedals in this position momentarily. 3) Slowly release the brake pedals. Stop for ten seconds
 before you operate the brakes again.
 (g)  
Remove the power from hydraulic system 4 (AMM 29-11-00/201).

 (h)  
Slowly push one set of brake pedals to the limit of travel.

 1)  Make sure that 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
____ indication of brake operation.
 2)  Make sure the pressure indication of the HYD BRAKE PRESS gage, on the P1 panel, continues to show 3000 | 200 psi.
 (i)  
Remove the power from hydraulic system 1 (AMM 29-11-00/201).

 (j)  
Slowly push one set of brake pedals to the limit of travel.

 1)  Make sure the brakes operate when you push down on a set of brake bedals.
 NOTE: Look for movement at the pistons of a brake unit for
____ indication of brake operation.
 2)  Make sure the pressure indication of the HYD BRAKE PRESS gage, on the P1 panel, decreases when the brake pedals are pushed.
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747-400 MAINTENANCE MANUAL
 (k)  Do a check of the fluid level in the reservoir for hydraulic system 4. 1) Fill up the reservoir to the correct level if the fluid
 level is low (AMM 12-12-01/301).
 E. Put the Airplane Back to Its Usual Condition
 S 094-031
 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 094-032

 (2)  
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

 (3)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 S 844-043
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 HYDRAULIC BRAKE ACCUMULATOR - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)  
The removal of a hydraulic brake accumulator

 (2)  
The installation of a hydraulic brake accumulator.

 B.  
One hydraulic brake accumulator is installed on the center web of the keel beam in the wheel well for the right body gear.

 TASK 32-41-09-004-001
 2.  Hydraulic Brake Accumulator Removal (Fig. 401)___________________________________
 A.  General
 (1)  
In subsequent steps, the hydraulic brake accumulator is referred to as the accumulator.

 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

 (5)  
IPC 32-41-09 Fig. 1

 C.  
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right

 D.  
Prepare for Removal

 S 864-034
 (1)  
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
　
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