S 864-028
(3)
Do this task to pressurize hydraulic systems No. 1 and 4:
"Hydraulic System Pressurization" (AMM 29-11-00/201).
S 864-029
(4)
Put the speed brake control lever in UP the position to lift the spoilers.
NOTE: With the spoilers up, the trailing edge flaps will not touch
____ when they are retracted.
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A
747-400
MAINTENANCE MANUAL
A
TRAILING
EDGE BEAM
A
CONTROL PISTON
PACKAGE ROD END INBOARD
FLIGHT
SPOILER SPOILER-TO-FLAP
MINIMUM CLEARANCE
1
MIDFLAP
FWD SEE A
A-A
CONTROL PACKAGE PISTON ROD
LOCKING DEVICES
CHECKNUT
PISTON ROD END
A
NOTE: THE AIRPLANE MUST BE SUPPORTED ON ITS LANDING GEAR WHEN YOU MEASURE THIS CLEARANCE.
1
THE SPOILER PANELS ARE NOT FLAT. MEASURE THE CLEARANCE AT THE NEAREST POINT. THERE IS NO MAXIMUM CLEARANCE BECAUSE OTHER PARTS OF THE PANEL CAN HAVE A GREATER CLEARANCE. THE SPOILER HAS A 0.50 INCH (12.7 mm) PRELOAD AGAINST THE MIDFLAP.
Inboard Flight Spoiler-to-Flap Adjustment Figure 402
C79482
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747-400 MAINTENANCE MANUAL
S 864-059
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
CONTROL LEVER.
(5) Retract the trailing edge flaps fully.
NOTE: You must fully retract the trailing edge flaps with hydraulic
____ power. Keep the flap control lever in the UP position for 1 minute before you measure the clearance.
S 864-031
(6)
Put the speed brake control lever in the DOWN position to lower all spoilers until the control package piston is fully retracted.
S 864-032
(7)
Turn the aileron control wheel clockwise to make sure that spoiler No. 5 is in the full down position.
S 224-078
(8)
Measure the clearance between the spoiler No. 5 and the trailing edge flaps (Fig. 402).
(a)
Make sure the clearance at the nearest point between the spoiler No. 5 and the trailing edge flaps is 0.055-0.075 inch (1.40-1.91mm).
(b)
Extend the trailing edge flaps fully (AMM 27-51-00/201).
(c)
Adjust the piston rod end 1 turn (360 degrees) to lower the trailing edge of the spoiler to 0.567 inch (14.4mm).
S 864-034
(9) Turn the aileron control wheel counterclockwise to make sure that spoiler No. 8 is in the full down position.
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747-400 MAINTENANCE MANUAL
S 224-077
(10)
Measure the clearance between the spoiler No. 8 and the trailing edge flaps (Fig. 402).
(a)
Make sure the clearance for the spoiler No. 8 is the same as the clearance for the spoiler No. 5.
S 824-060
(11) 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.
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