(a)
P180, DC Power Distribution Panel
1) 180E6, LATERAL CONT VLV SYS 2
2) 180H23, LATERAL CONT VLV SYS 3
S 862-018
(6)
Put the FLT CONTROL HYD POWER - WING switches for systems No. 2 and No. 3 on the pilots' overhead panel, P5, to the NORM position.
S 862-019
(7)
Do this task to pressurize hydraulic systems No. 2 and 3:
"Hydraulic System Pressurization" (AMM 29-11-00/201).
S 862-020
(8)
Move the speed brake control lever to bleed the spoiler control package.
G.
Examine the Spoiler to Flap Clearance
S 862-021
WARNING: OPEN THE CIRCUIT BREAKERS TO PREVENT THE SPOILER RETRACTION.
_______ IF YOU USE THE SPEED BRAKE LEVER TO LIFT THE SPOILERS, AND IF YOU RELEASE PRESSURE IN THE HYDRAULIC SYSTEMS, THE SPOILERS WILL AUTOMATICALLY RETRACT. THIS CAN CAUSE INJURY TO PERSONS.
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
(2)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
(3)
Do this task: "Hydraulic System Pressurization" (AMM 29-11-00/201).
S 862-024
(4)
Put the speed brake control lever in the UP position to lift the spoilers.
S 862-022
S 862-023
NOTE: With the spoilers up, the trailing edge flaps will not touch
____ the spoiler panels when you retract the flaps.
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S 862-116
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 862-026
(6)
Put the speed brake control lever in the DOWN position to lower all spoilers until the control package piston is fully retracted.
S 862-027
(7)
Turn the aileron control wheel clockwise to make sure spoilers No. 1 thru 4 are in the full down position.
S 222-028
(8)
Make sure the clearance between the flight spoiler and the flap is in the tolerance shown on Fig. 202. There is no specified maximum clearance.
S 862-029
(9)
Turn the aileron control wheel counterclockwise to make sure that spoilers No. 9 thru 12 are in the full down position.
S 222-030
(10)
Make sure the clearance between the flight spoilers and the trailing edge flap is in the tolerance shown in Fig. 202. There is no specified maximum clearance.
S 822-117
(11)
Adjust the spoiler to flap clearance 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 lock if you lifted the
spoilers.
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747-400 MAINTENANCE MANUAL
(b) Do this task: "Hydraulic System Depressurization" (AMM 29-11-00/201).
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