install the rig pin. 2) Tighten the checknut on the control rod and install the cotter pins in the bolts.
 S 835-033
 (23)
 Ensure the speed brake lever is in the DN position.

 S 215-132

 (24)
 Make sure the speed brake sequence mechanism touches the quadrant stop (Fig. 502).

 S 835-034

 (25)
 Adjust the speed brake inputs to the differential mechanisms (Fig. 502):

 (a)  
Move the speed brake lever to the DN position.

 (b)  
Make sure you can easily install the rig pins A/S-4 and A/S-5 in the differential mechanisms to make sure the spoiler system is in the center.

 (c)  
Make sure you can easily install the rig pin A/S-13 in the differential mechanism in the right wing gear wheel well.

 (d)  
Make sure you can easily install the rig pin A/S-12 in the differential mechanism in the left wing gear wheel well.

 (e)  
If you cannot easily install the rig pins A/S-12 or A/S-13, adjust the applicable rod assembly and tighten checknuts.

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A
747-400 MAINTENANCE MANUAL
 S 415-189
 (26)
 Install ceiling panels that were removed (AMM 25-59-01/401).

 I.
Examine the Clearance Between the Ground Spoilers and the Flaps

 NOTE: The airplane must be on its landing gear when you measure this
____
 clearance.

 S 865-035
 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 THE PRESSURE IN HYDRAULIC SYSTEMS NO. 1 AND 4, THE SPOILERS WILL RETRACT AUTOMATICALLY. THIS CAN CAUSE INJURY TO PERSONS.
 (1)
Open the following circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7G6, SPEED BRAKE AUTO CONT

 S 865-036
 (2)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-037

 (3)  
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 865-038

 (4)  
Move the speed brake lever to the UP position to lift the spoilers.

 NOTE: With the spoilers up, the trailing edge flaps will not hit
____ the spoilers during the retraction of the flaps.
 S 865-135
 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)  Do this task: "Trailing Edge Flaps Retraction" (AMM 27-51-00/201).
 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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-040
 (6)  
Move the speed brake lever to the DN position to lower all of the spoilers until the control package piston is fully retracted.

 S 225-163

 (7)  
Measure the clearance between the spoilers No. 6 and 7 and the trailing edge flaps (Fig. 504).

 (a)  
Make sure the clearance at the nearest point between the spoilers No. 6 and 7 and the trailing edge flaps is 0.055-0.075 inch (1.397-1.905mm).

 (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 825-136
 (8)  Adjust the clearance between the ground spoiler and the flaps if it is not in the tolerance:
 WARNING: DO NOT PUT A PART OF YOUR BODY BETWEEN THE SPOILER AND THE
　
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