spoilers.
(b)
Do this task: "Hydraulic Systems Depressurization"
(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.
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. The rod end will move in or out of the rod.
NOTE: Each 1/4 turn of the piston rod will change the
____ clearance by approximately 0.14 inch.(3.56mm) If you turn the piston rod to change the clearance by 0.35 inch (8.89mm) or more, you must do the spoiler system adjustment (AMM 27-61-00/501).
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(e) Fill the rod end with the corrosion preventive compound before the adjustment if it is necessary:
NOTE: If the piston rod is not full of corrosion preventive
____ compound there will be corrosion.
1) Fill the rod end if you removed it from the control package. 2) Fill the rod end if you moved the rod end out of the piston
0.50 inch or more. 3) Remove the rod end from the spoiler and the control
package. 4) Fill the piston with 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 on the external threads.
(h)
Tighten the checknut hand tight.
(i)
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
(j)
Put the speed brake control lever in the DOWN position to lower all spoilers until the control package piston is fully retracted.
(k)
Make sure the clearance between the spoiler and the flap is in the tolerance shown in Fig. 402. There is no specified maximum clearance. 1) If the clearance is not in the tolerance, loosen the
checknut and adjust the spoiler again.
(l)
If the clearance is in the tolerance, tighten the checknut to 2150-2350 pound-inches (242.9-265.5Nm).
(m)
Loosen the checknut and make sure the parts of the locking device stay engaged correctly.
(n)
Tighten the checknut to 2150-2350 pound-inches (242.9-265.5Nm).
1) Make sure the parts of the locking device stay engaged correctly.
(o)
Install the lockwire on the checknut and the locking device.
(p)
Clean all grease from the checknut and the locking device with naphtha.
(q)
Apply the silicone sealant on the checknut and the locking device.
(r)
Lower the spoilers.
K.
Put the Airplane Back to Its Usual Condition
S 864-055
(1)
Do this task to depressurize hydraulic systems No. 1 and 4:
"Hydraulic System Depressurization" (AMM 29-11-00/201).
(2)
Remove the safety device.
S 094-056
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S 864-057
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 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 飞行操纵 FLIGHT CONTROLS 6(50)
