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A
747-400 MAINTENANCE MANUAL
S 486-597
(5)
If you use a hydraulic service cart for the pressure source, connect the hydraulic service cart (AMM 29-11-00/201):
(a)
Connect the cart to the ground-service disconnect on the pressure module of the No. 3 hydraulic system.
(b)
Install a flowmeter in the cart pressure line which connects to the No. 3 hydraulic system.
(c)
Connect the return line on the hydraulic service cart to the No. 3 return module.
S 486-598
(6)
If you use the system demand pump for a pressure source, release the pressure in hydraulic system No. 3 (AMM 29-11-00/201):
(a)
Install a flowmeter in the pressure line of the 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. 3 main fuel tank.
NOTE: The fuel weight values are calculated with a fuel
____
density of 6.7 pounds per gallon.
S 866-599
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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 866-603
(8)
Put the UPPER YAW DAMPER switch on the P5 overhead panel in the INOP position.
S 866-604
(9)
Put the A/P ENGAGE switches (L, C, and R) on the control panel for the AFCS mode in the off position.
S 866-605
(10)
Put the system No. 3 WING FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.
S 866-606
(11)
Put the system No. 3 TAIL FLT CONTROL SHUTOFF switch on the P461 overhead maintenance panel in the ON position.
S 866-607
(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. 3 - Gross System Internal Leakage Check
S 866-609
(1) Pressurize hydraulic system No. 3 to 3000 psig.
S 866-663
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.
(3)
Keep the flight controls in the neutral position.
S 866-611
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747-400 MAINTENANCE MANUAL
S 796-703
(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. 3
____
hydraulic system.
S 976-612
(5) If the gross internal leakage of the No. 3 hydraulic system is more than 5 GPM, do the Hydraulic System No. 3 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. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 液压 HYDRAULIC 1(49)
