(a)
Connect the cart to the quick-disconnect on the pressure module of the No. 2 and No. 4 hydraulic systems.
(b)
Install a flowmeter in the cart pressure line which connects to the No. 2 hydraulic system.
(c)
Connect the return line on the hydraulic service cart to the No. 2 and No. 4 return modules.
S 486-624
(6)
If you use the system demand pump for a pressure source, release the pressure in hydraulic system No. 2 (AMM 29-11-00/201).
(a)
Install a flowmeter in the pressure line of the No. 2 demand pump between the pump and the pressure module.
(b)
Make sure there is a minimum of 5400 pounds (2450 kg) of fuel in the No. 2 main fuel tank and 2000 pounds (900 kg) of fuel in the No. 4 main fuel tank.
NOTE: The fuel weight values are calculated with a fuel
____
density of 6.7 pounds per gallon.
S 866-679
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: The flaps and the stabilizer to be in the neutral
____
position.
S 866-629
(8)
Put the LOWER YAW DAMPER switch, on the P5 overhead panel, in the INOP position.
S 866-630
(9)
Put the A/P ENGAGE switches (L, C, and R) on the control panel for the AFCS mode in the off position.
S 866-631
(10)
Put the system No. 2 WING FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.
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747-400 MAINTENANCE MANUAL
S 866-632
(11)
Put the system No. 2 TAIL FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.
S 866-633
(12)
Make sure that the selector handle for the landing gear on the P2 first officer's panel is in the OFF position.
E.
Hydraulic System No. 2 - Gross System Internal Leakage Check
S 866-635
(1) Pressurize hydraulic systems No. 2 and No. 4 to 3000 psig.
S 866-662
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 866-637
(3)
Keep the flight controls in the neutral position.
S 976-680
(4)
Let the flow become stable for 3 minutes and make a record of this flow.
NOTE: This flow is the gross internal leakage for the No. 2
____
hydraulic system.
S 796-681
(5) If the gross internal leakage of the No. 2 hydraulic system is more than 5 GPM, do the Hydraulic System No. 2 Full Internal Leakage Check procedure.
NOTE: This procedure will find the component which has too much
____
leakage.
If the gross internal leakage for either of the inboard systems (2 or 3) exceeds 3 GPM the other inboard system must not exceed 3 GPM. Maximum gross internal leakage for a inboard system (2 or 3) is 5 GPM.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
F. Put the Airplane Back to Its Usual Condition
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