S 016-570

 (4)  
Open the doors on the trailing edge fairing for engine No. 4 (AMM 54-62-00/201).

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747-400 MAINTENANCE MANUAL
 S 486-571
 (5)  
If you use a hydraulic service cart for the pressure source, connect the hydraulic service cart:

 (a)  
Connect the cart to the ground-service disconnect on the pressure module of the No. 4 hydraulic system.

 (b)  
Install a flowmeter in the cart pressure line which connects to the No. 4 hydraulic system.

 (c)  
Connect the return line on the hydraulic service cart to the No. 4 return module.

 (d)  
Put the system No. 4 HYD PUMPS DEMAND switch in the ON position.

 S 486-664
 (6)  
If you use the system demand pump for a pressure source, release the pressure in hydraulic system No. 4 (AMM 29-11-00/201)

 (a)  
Install a flowmeter in the pressure line on the demand pump between the pump and the pressure module.

 (b)  
Make sure there is a minimum of 2000 pounds (900 kg) of fuel in the No. 1 and No. 4 main fuel tanks.

 NOTE: The fuel weight values are calculated with a fuel
____
 density of 6.7 pounds per gallon.

 S 866-665
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (7)  Make sure the control column, the control wheel, and the rudder pedals are in the neutral position.
 NOTE: It is not necessary for the flaps and the stabilizer to be in
____
 the neutral position.

 S 866-576
 (8)  Put the A/P ENGAGE switches (L, C, and R) on the control panel for the AFC model in the off position.
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 S 866-577
 (9)  
Put the system No. 4 WING FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.

 S 866-578

 (10)
 Put the system No. 4 TAIL FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.

 S 866-704

 (11)
 Make sure the speed brake control lever is in the DN position.

 S 866-579

 (12)
 Make sure that the handle for the landing gear selector on the P2 first officer's panel is in the OFF position.

 E.
Hydraulic System No. 4 - Gross Internal Leakage Check

 S 866-581
 (1)  Pressurize hydraulic system No. 4 to 3000 psig.
 S 866-582
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (2)  
Operate the flight controls through four or five cycles.

 S 866-584

 (3)  
Operate the outboard flaps through 3 full cycles.

 (4)  
Make sure the flight controls are in the center position.

 S 976-586

 (5)  
Let the flow become stable for 3 minutes and make a record of this flow.

 S 866-585
 NOTE: This flow is the gross internal leakage for the No. 4
____
 hydraulic system.

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