S 824-051
(8) Adjust the clearance between the spoiler and the flap if it is not in the tolerance.
WARNING: DO NOT PUT A PART OF YOUR BODY BETWEEN THE SPOILER AND THE
_______ WING UNLESS THE SPOILER ACTUATOR IS LOCKED OR THE HYDRAULIC POWER IS RELEASED. THIS CAN CAUSE INJURY TO PERSONS.
(a) Open the applicable trailing edge panel and extend the flaps or lift the spoilers to get access to the spoiler control package. 1) Install the spoiler actuator locks if you lifted the
spoilers.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-62-01
ALL ú ú 18 Page 411 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) Do this task to depressurize hydraulic system No. 4: "Hydraulic System Depressurization" (Ref 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.
(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 27-62-00/501).
(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 the 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 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 on the external threads. 1) Tighten the checknut hand tight.
(h)
Do this task to pressurize hydraulic system No. 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
(i)
Put the speed brake lever in the DOWN position to lower all spoilers until the control package piston is fully retracted.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-62-01
ALL ú ú 07 Page 412 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(j)
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.
(k)
If the clearance is in the tolerance, tighten the checknut to 2150-2350 pound-inches (243-265 N-m).
(l)
Loosen the checknut and make sure the parts of the locking device stay engaged correctly.
(m)
Tighten the checknut to 2150-2350 pound-inches (243-265 N-m).
1) Make sure the parts of the locking device stay engaged correctly.
(n)
Install the lockwire on the checknut and the locking device.
(o)
Clean all grease from the checknut and the locking assembly with naphtha.
(p)
Apply the silicone sealant on the checknut and the locking device.
(q)
Lower the spoilers.
K.
Put the Airplane Back to Its Usual Condition
S 084-043
(1)
Remove the safety device and harness.
S 864-044
(2)
Do this task to depressurize hydraulic systems No. 1 and 4:
"Hydraulic System Depressurization" (AMM 29-11-00/201).
S 864-045
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
