S 865-136
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT OCCUR.
 (11)
 If it is necessary to release the remaining pressure from hydraulic system No. 4, do the step that follows:

 (a)  
Operate the elevators until the pressure indication for hydraulic system No. 4 shows less than 160 psig.

 S 865-137
 (12)
 Move the No. 4 TAIL FLT CONTROL SHUTOFF switch to the OFF position.

 S 865-138

 (13)
 Make sure the HYD BRAKE PRESS gage on the P1 panel is |100 psig of the hydraulic pressure it was when hydraulic system No. 4 was pressurized.

 S 865-140

 (14)
 Make sure the EICAS pressure indications for hydraulic systems No. 1 and 2 show 2900-3150 psig.

 S 865-141

 (15)
 Make sure the SYS FAULT light for hydraulic system No. 4, on the pilot's overhead panel, P5, is on.

 S 865-142

 (16)
 Make sure the SYS FAULT lights for hydraulic systems No. 1 and 2, on the P5 panel, are off.

 S 865-143

 (17)
 Make sure the BRAKE SOURCE message does not come into view on the upper EICAS display.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 S 865-144
 (18)
 Quickly push the captain's brake pedals to the stops and hold for 2-4 seconds.

 S 865-145

 (19)
 Monitor the indications as follows:

 NOTE: If you cannot monitor the indications in
____ the time specified above, do this step before you monitor each indication.
 (a)  
Make sure the pressure shown on the HYD BRAKE PRESS gage on the P1 panel does not change.

 (b)  
Make sure the EICAS pressure indication for hydraulic system No. 1 momentarily decreases.

 (c)  
Make sure the EICAS pressure indication for hydraulic system No. 2 does not change.

 S 865-146
 (20)
 Release the brake pedals.

 S 865-147

 (21)
 Remove the pressure from hydraulic system No. 1 (AMM 29-11-00/201).

 NOTE: Do not operate the brake pedals while you remove the
____
 pressure.

 S 865-148
 (22)
 Move the No. 1 TAIL FLIGHT CONTROL SHUTOFF switch on the P461 panel to the ON position.

 S 865-149

 (23)
 Make sure the EICAS pressure indication for hydraulic system No. 1 shows less than 160 psig.

 S 865-150
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (24)
 If it is necessary to release the remaining pressure from hydraulic system No. 1, do the step that follows:

 (a)  
Operate the elevators until the hydraulic system No. 1 pressure indication on EICAS shows less than 160 psi.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-00
 ALL  ú ú 04 Page 506 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-151
 (25)
 Move the No. 1 TAIL FLT CONTROL SHUTOFF switch to the OFF position.

 S 865-152

 (26)
 Make sure the HYD BRAKE PRESS gage on the P1 panel is |100 psig of the hydraulic pressure it was when hydraulic system No. 4 was pressurized.

 S 865-153

 (27)
 Make sure the EICAS pressure indication for hydraulic system No. 2 shows 2900-3150 psig.

 S 865-154

 (28)
 Make sure the SYS FAULT lights for hydraulic systems No. 1 and 4, on the P5 panel, are on.

 S 865-155

 (29)
 Make sure the BRAKE SOURCE light on the P1-4 panel is off.

 S 865-156

 (30)
 Quickly push the captain's brake pedals to the stops and hold for 2-4 seconds.
　
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