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.
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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. 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 measure the clearances again.
(e) If you removed the rod end, or if you move the rod end out of
the piston 0.50 inch or more, fill the rod end with corrosion
preventive compound:
NOTE: If the piston rod is not full of corrosion preventive____
compound there will be corrosion.
1) Remove the rod end from the spoiler and the control
package.
2) Fill the piston with corrosion preventive compound.
3) 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 specified tolerance.
1) If the clearance is not in the tolerance, adjust the
spoiler again.
S 432-124
(11)
If the clearance is in the tolerance, tighten the checknut:
(a)
Tighten the checknut to 2150-2350 pound-inches(242.9-265.5Nm).
(b)
Loosen the checknut and make sure the parts of the locking device stay engaged correctly.
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MAINTENANCE MANUAL
(c)
Tighten the checknut to 2150-2350 pound-inches(242.9-265.5Nm).
1) Make sure the parts of the locking device stay engaged correctly.
(d)
Install the lockwire on the checknut and the locking device.
(e)
Clean all grease from the checknut and the locking device with naphtha.
(f)
Apply the silicone sealant on the checknut and the locking device.
S 862-125
(12)
Lower the spoilers.
H.
Examine the Adjustment of the Input Arm
S 862-053
(1)
Move the captain's aileron control wheel to the neutral position as shown by the trim indicator decal on the control wheel.
(a)
Make sure rig pin A/S-19 or A/S-21 (0.309 to 0.311 inch diamter, minimum length 3.0) fits freely in the spoiler quadrant.
NOTE: Rigging pins are part of kit G12001-50.
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