32-41-06
 ALL  ú ú 01 Page 406 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (j)  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.
 (k)  
With hydraulic system No. 1 pressurized for at least two minutes, do a check for leaks at alternate source selector valve No. 1.

 (l)  
Pressurize hydraulic system No. 4 (AMM 29-11-00/201) so both hydraulic systems No. 1 and No. 4 are pressurized.

 WARNING: MAKE SURE THE LANDING GEAR GROUND LOCKS ARE INSTALLED
_______ (AMM 09-11-00/201). AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (m)  Do this sequence of steps six times to bleed any small quantities of air from the hydraulic system: 1) Use the LOCK OVERRIDE button and move the landing gear
 lever from the DOWN to UP position. 2) Wait five to six seconds. 3) Use the LOCK OVERRIDE button and move the landing gear
 lever from the UP to the DOWN position.
 (n)  
Wait two minutes.

 (o)  
Remove the power from the hydraulic systems No. 1 and No. 4 (AMM 29-11-00/201).

 (p)  
Do a check for leaks at the Alternate (Brake) Source Selector Valve No. 1.

 (q)  
Do a check of the fluid level in the reservoir for hydraulic system No. 4. 1) Fill up the resrvoir to the correct level if the fluid

 level is low (AMM 12-12-01/301).

 (r)  
Do a check of the fluid level in the reservoir for hydraulic system No. 1. 1) Fill up the reservoir to the correct level if the fluid

 level is low (AMM 12-12-01/301).
 S 874-039
 (6)  
If you replaced brake source selector valve No. 2, do these steps:

 (a)  
Clean all signs of hydraulic fluid from the Alternate (Brake) Source Selector Valve No. 2 in the area of the ports and the hydraulic line attachment fittings so you can later detect any sign of hydraulic fluid leaks.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-06
 ALL  ú ú 01 Page 407 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 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.
 (b)  
Pressurize hydraulic system No. 4 (AMM 29-11-00/201).

 (c)  
With hydraulic system No. 4 pressurized for at least two minutes, do a check for leaks at alternate source selector valve No. 2.

 (d)  
Remove the power from hydraulic system No. 4 (AMM 29-11-00/201).

 (e)  
Pressurize hydraulic system No. 2 (AMM 29-11-00/201).

 (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)  
With hydraulic system No. 2 pressurized for at least two minutes, do a check for leaks at alternate source selector valve No. 2.

 (h)  
Remove the power from hydraulic system No. 2 (AMM 29-11-00/201).

 (i)  
Pressurize the hydraulic systems in this sequence: No. 4, No. 1, and No. 2 (AMM 29-11-00/201).

 (j)  
Wait two minutes.

 (k)  
Remove the power from hydraulic system No. 4 to depressurize it (AMM 29-11-00/201).

 (l)  
Wait two minutes.

 (m)  
Remove the power from the hydraulic systems No. 1 and No. 2 (AMM 29-11-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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