locking tools.
(b)
Do this task: "Depressurize Hydraulic System"
(AMM 29-11-00/201).
CAUTION: LOOSEN THE CHECKNUT SUFFICIENTLY TO MOVE THE TAB ON THE
_______ LOCKING DEVICE OUT OF THE SLOT IN THE PISTON ROD. YOU CAN BREAK THE TAB FROM THE LOCKING DEVICE.
(c) Loosen the checknut on the piston rod end.
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A
747-400
MAINTENANCE MANUAL
CAUTION: DO NOT TURN THE PISTON ROD IF THE CONTROL PACKAGE IS
_______ PRESSURIZED. YOU CAN CAUSE DAMAGE TO THE INTERNAL SEALS.
(d) Turn the piston rod to adjust the clearance between the spoiler and the flap.
NOTE: Each 1/4 turn of the piston rod will change the
____ clearance between the spoiler and the flap by approximately 0.14 inch (3.6mm). If you turn the piston rod to change the clearance by 0.35 inch (8.9mm) or more, you must measure the clearances again.
CAUTION: MAKE SURE THE PISTON ROD IS FULL OF THE CORROSION
_______ PREVENTIVE COMPOUND. IF THE PISTON ROD IS NOT FULL OF THE CORROSION PREVENTIVE COMPOUND, THERE WILL BE CORROSION.
(e) Fill the rod end with the corrosion preventive compound before the adjustment if it is necessary: 1) Fill the piston rod if you removed the piston rod from the control package. 2) Fill the piston rod if you moved the rod end out of the piston 0.50 inch(12.7mm) or more. 3) Remove the rod end from the spoiler and the control
package. 4) Fill the piston with the corrosion preventive compound. 5) Install the rod end.
(f)
Engage the locking device with the piston rod.
(g)
Apply a layer of the corrosion preventive compound to the external threads.
(h)
Tighten the checknut hand tight.
(i)
Remove the spoiler actuator locking tools, if it is necessary.
(j)
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).
(k)
Move the speed brake lever to the DN position to lower the spoilers until the control package piston is fully retracted.
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747-400 MAINTENANCE MANUAL
(l)
Make sure the clearance between the ground spoiler and the flaps is in the tolerance shown in Fig. 504. There is no specified maximum clearance. 1) If the clearance is not in the tolerance, loosen the
checknut and adjust the spoiler again.
(m)
If the clearance is in the tolerance, tighten the checknut: 1) Tighten the checknut to 2150-2350 pound-inches (243-265Nm) (for spoilers No. 6 and 7). 2) Loosen the checknut and make sure the parts of the locking
mechanism stay engaged correctly. 3) Tighten the checknut to 2150-2350 pound-inches (243-265Nm). 4) Make sure the parts of the locking device stay engaged
correctly.
(n)
Clean all grease from the checknut and the locking assembly with the naphtha.
(o)
Install the lockwire on the checknut and the locking device.
(p)
Apply the silicone sealant on the checknut and the locking device.
(q)
Move the speed brake lever to the DN position to lower the spoilers.
J.
Put the Airplane Back to Its Usual Condition
S 865-137
(1)
Remove the DO-NOT-CLOSE tag and close the following circuit breaker:
(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
S 865-058
(2)
Do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).
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本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 6(115)
