S 224-027

 (19)
 Make sure the flap trailing edge is 0.10 inch minimum from the retracted position at the center lines of the linkages (Fig. 401).

 S 824-028

 (20)
 Adjust the flap upstops:

 (a)  
Turn each adjustable screw (58) until you get the approved clearance between the flap trailing edge and the wing structure (Fig. 401).

 NOTE: Small increment adjustment of the screw stops is
____ necessary for all the stops to have the same load.
 (b)  
Tighten the checknut (57) on each upstops stop to 30-40 pound-inches.

 (c)  
Install the lockwire.

 S 224-029
 (21)
 Examine the upstops pad (55) on the wing ribs and replace the pad if you find one of the two:

 (a)  
The depth of the worn area is more than 1/10 inch.

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747-400 MAINTENANCE MANUAL
 (b)  The hexagonal worn pattern shows on the pad.
 S 224-030
 (22)
 Make sure the clearances at the sides of the flap and at the forward edge are not more than the specified limits (Sections A-A, D-D, E-E and G-G, Fig. 402).

 S 434-031

 (23)
 Install the stop access screws (56).

 S 224-032

 (24)
 Make sure the contour of the front edge of the flap is not more than the specified limits (Section D-D, Fig. 402).

 (a)  
Adjust the contour if it is more than the specified limits: 1) Make a note of the number and the distance outside the limits of the flaps that do not align. 2) Extend the flaps electrically: a) Push the ALTN FLAPS ARM switch to put the flap system in alternate control.

 b) Move the ALTN FLAPS EXT/RET switch to the EXT position. 3) Install the blocks (47) (Fig. 401). 4) Remove the bolt (11) at each pivot point C. 5) Loosen the checknuts (10) on the adjustable links CD.
 CAUTION: MAKE SURE TO TURN THE LINKS CD EQUALLY AT EACH
_______ LINKAGE SET. FAILURE TO TURN THE LINKS CD EQUALLY CAN CAUSE DAMAGE TO THE LINKAGE.
 6)  Turn the link CD as shown on the subsequent data to correct the flaps if they do not align:
 Flap No.________ Not Aligned (inch)__________________ Adjustment
 6-10 +0.160/+0.130 Make longer 2-1/2 turns and +0.130/+0.100 Make longer 2 turns 17-21 +0.100/+0.070 Make longer 1-1/2 turns
 +0.070/+0.040 Make longer 1 turn +0.040/+0.010 Make longer 1/2 turn +0.010/-0.050 No adjustment +0.050/-0.080 Make shorter 1/2 turn
 1E-5 +0.130/+0.090 Make longer 1-1/2 turns and +0.090/+0.050 Make longer 1 turn 22-26E +0.050/+0.010 Make longer 1/2 turn
 +0.010/-0.050 No adjustment -0.050/-0.090 Make shorter 1/2 turn
 7) Tighten the checknuts (10) on links CD to 70-110 pound-inches. 8) Install the lockwire through the checknut, washer and rod end.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 9) Align the links CD and FEBC.
 10) Install the bolt (11), washers (12), bearing (15), spacer

 (14) and nut (13). 11) Tighten the nut to 370-610 pound-inches.
 S 224-034
 (25)
 Make sure the flap seals are not out of tolerance (Sections B-B, E-E, F-F and G-G, Fig. 402).

 S 864-035

 (26)
 Put the flap control lever in full DOWN detent to extend the LE flaps pneumatically.

 S 224-036

 (27)
 Make sure the distance between the flap linkage and the structural stop is 0.040 to 0.12 inch (Section C-C, Fig. 402).

 S 224-037

 (28)
 Make sure the difference from the flap to the folding fairing is not more than the specified limits (Section C-C, Fig. 402).

 S 224-038

 (29)
 Make sure the flap aligns with the adjacent flaps to 0.3 inch, measured at the joint between the flap and the folding fairing.

 S 864-039

 (30)
　
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