CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 493-027
(4)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
S 683-005
(5)
Drain the hydraulic fluid from the shock strut or shock struts that you will service (AMM 32-13-02/301).
S 613-023
CAUTION: USE ONLY THE SPECIFIED HYDRAULIC FLUID WHICH IS SHOWN ON THE
_______ SHOCK STRUT. OTHER TYPES OF FLUID CAN CAUSE DAMAGE TO THE SHOCK STRUT SEALS.
DO NOT GET HYDRAULIC FLUID ON THE TIRES. THE FLUID WILL CAUSE DAMAGE TO THE TIRES.
(6) Fill the shock strut with the specified hydraulic fluid:
(a)
Remove the pressure cap from the oil fill valve on the pressure gage (View B).
(b)
Attach the hydraulic fluid line to the oil fill valve.
(c)
Make sure that the shutoff valve on the lower outer cylinder is open (View B).
NOTE: Use a 3/16-inch hex wrench to open the shutoff valve if
____ it is necessary.
(d) Fill the shock strut until the hydraulic fluid flows through the air valve port without air bubbles.
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747-400 MAINTENANCE MANUAL
(e)
Close the oil fill valve.
(f)
If you did not use the fully formulated fluid, do these steps that follow to add Lubrizol: 1) Remove a small quantity of fluid from the shock strut.
a) Open the oil fill valve. b) Drain approximately 40 ounces of fluid from the shock strut.
NOTE: Use the graduated container.
____
2) Close the oil fill valve.
(g)
Remove the air charging valve.
(h)
Remove and discard the old packing (o-ring) from the air charging valve.
(i)
Add 33 ounces of Lubrizol into the shock strut through the air charging valve port.
(j)
Connect the hydraulic line to the oil fill valve and open the oil fill valve.
(k)
Fill the shock strut until the hydraulic fluid flows through the air charging valve port without air bubbles.
(l)
Lubricate a new packing (o-ring) for the air charging valve with the shock strut fluid.
(m)
Install the new packing (o-ring) on the air charging valve.
(n)
Install the air charging valve.
(o)
Tighten the air charging valve to 120-156 pound-inches.
(p)
Safety the air charging valve with lockwire.
(q)
Close the oil fill valve.
(r)
Remove the hydraulic charging line from the oil valve.
S 433-044
(7)
Install the pressure cap on the oil fill valve.
S 433-007
(8)
Connect the hose from the service manifold assembly to the air charging valve.
(9)
Pressurize all the shock struts with nitrogen or dry air:
S 613-009
NOTE: Make sure the air charging valves are open.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CAUTION:_______ PRESSURIZE THE BODY LANDING GEAR FIRST OR PRESSURIZE ALL
OF THE MAIN LANDING GEAR AT THE SAME TIME. THE AIRPLANE
CAN FALL TO THE SIDE IF YOU PRESSURIZE THE SHOCK STRUTS AT
中国航空网 www.aero.cn
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本文链接地址：747-400 AMM 飞机维护手册 SERVICING 1(69)
