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 ALL  ú ú 04 Page 530 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 WARNING:_______ MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
 RUDDERS AND ELEVATORS BEFORE YOU MOVE THE CONTROLS.
 INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF

 THE AREA IS NOT CLEAR.
 3)  If it is necessary to release the remaining pressure from hydraulic system No. 1, operate the elevators until the pressure on EICAS shows less than 160 psi.
 4)  Move the No. 1 TAIL FLT CONTROL SHUTOFF switch to the OFF
 position.Make sure the HYD BRAKE PRESS gage on the P1-4 panel is within 100 psig of the pressure it was at when hydraulic system No. 4 was pressurized.Make sure the pressure indication for hydraulic system No. 2 on EICAS is within 100 psig of the pressure supplied to the system.Make sure the SYS FAULT lights for hydraulic systems No. 1 and 4, on the P5 panel, are on.Make sure the BRAKE SOURCE light on the P1-4 panel is off.Quickly push the captain's brake pedals to the stops and hold for 2 - 4 seconds and monitor the indication as follows:
 NOTE: If you cannot monitor all of the necessary indication in
____ the time specified above, do this step again before you monitor each indication.
 1)  Make sure that the pressure shown on the HYD BRAKE PRESS gage on the P1-4 panel does not change.
 NOTE: The HYD BRAKE PRESS gage on the P1-4 panel can show
____ a decrease if hydraulic system No. 2 is pressurized by the airplanes demand pump only. This decrease will occur if the pressure shown on EICAS falls below approximately 1400 psig before it goes to 3000 psi.
 2)  Make sure the pressure indication for hydraulic system
 No. 2 on EICAS momentarily decreases.Release the brake pedals.Remove the pressure from hydraulic system No. 2 (AMM 29-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-00
 ALL  ú ú 03 Page 531 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING: MAKE SURE YOU OPEN THE APPLICABLE CIRCUIT BREAKERS FOR
_______ ENGINE IGNITION BEFORE YOU OPEN THE ENGINE FUEL CONT VALVE CIRCUIT BREAKER. THE IGNITER PLUGS CAN AUTOMATICALLY FIRE IF YOU DO NOT OPEN THE CIRCUIT BREAKERS. WITH FUEL IN THE COMBUSTION CHAMBER AN INTERNAL ENGINE OR TAILPIPE FIRE CAN OCCUR. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE ENGINE.
 (aa) Open these circuit breakers attach DO-NOT-CLOSE tags:
 1)  P6, Main Power Distribution Panel
 a) 6F1, IGN 1 ENG 1
 b) 6K19, IGN 2 ENG 1
 c) 6G19, STBY IGN ENG 1
 d) 6F2, IGN 1 ENG 2
 e) 6K20, IGN 2 ENG 2
 f) 6G20, STBY IGN ENG 2
 g) 6F3, IGN 1 ENG 3
 h) 6K21, IGN 2 ENG 3
 i) 6G21, STBY IGN ENG 3
 j) 6F4, IGN 1 ENG 4
 k) 6K22, IGN 2 ENG 4
 l) 6G22, STBY IGN ENG 4
 m) 6L10, FUEL CONT VALVE

 NOTE: You must open the circuit breaker to cause the
____ master caution light and aural warning tone to come on. Up to five minutes can go by after you open the circuit breaker before they come on.
 (ab) Make sure the BRAKE SOURCE light is on (Fig. 503). (ac) Make sure the BRAKE SOURCE message shows on the upper EICAS display. (ad) Make sure the Master CAUTION lights on the P-10 glareshield
 panel are on. (ae) Make sure the aural warning tone was heard. (af) Pressurize hydraulic system No. 4 (AMM 29-11-00/201). (ag) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 1)  P6, Main Power Distribution Panel
 a) 6L10, FUEL CONT VALVE

 S 735-032
 (3)  
Do the steps that follow to do a test of normal brake operation:

 (a)  
Make sure the pressure indication for hydraulic system No. 4 on EICAS shows between 2900 and 3150 psig.

 (b)  
Make sure the HYD BRAKE PRESS gage shows 2900 - 3150 psi (Fig. 503).

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