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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F32398
A
747-400 MAINTENANCE MANUAL
 F. Adjust Rib No. 3
 S 865-016
 (1)  
The airplane must be on its landing gear and have the flaps fully retracted.

 S 225-002

 (2)  
Examine the clearance between the outboard aft corner of the panel and the upper surface of the midflap.

 S 825-003

 (3)  
If the clearance is not in the range of the limits shown in view D-D, adjust the rib as follows:

 (a)  
Extend the inboard trailing edge flaps.

 (b)  
Disconnect the lower end of the diagonal tie rod on the Number 3 adjustable rib.

 (c)  
Adjust the tie rod (view C-C) to get the necessary clearance (view D-D).

 NOTE: To adjust some tie rods, rotate the tie rod's tube.
____ To adjust other tie rods, turn the end fitting of the tie rod.
 S 825-011
 (4)  Until you get the necessary clearance, continue to adjust the tie rod:
 (a)  
Retract the flaps to measure the clearance.

 (b)  
Extend the flaps to adjust the diagonal tie rod.

 G. Adjust Ribs No. 1 and 2
 S 865-004
 (1)  Make sure when you extend the inboard flap, the upper panel at the inboard end and the upper surface of the flap do not touch.
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747-400 MAINTENANCE MANUAL
 S 485-023
 (2)  Put the rigging beam tool or the straightedge (12 ft) with the spacer blocks on the airplane as shown in Fig. 501.
 NOTE: If you use the rigging beam tool, you do not need to
____ find the crease line on the panel. The rigging beam tool has fixed spacers on it.
 (a)  If you will use the straightedge (12 ft), you must put the spacer blocks in the correct locations, Fig. 501 and Fig. 502.
 NOTE: Arc lengths (Fig. 502) are given to locate the
____ crease line at the number 1 rib (if the crease line is not visually evident). Proper location of the crease line is needed to properly locate the aft spacer block.
 NOTE: Arc length for arc "bc" can change depending on how
____ much of the panel's forward edge was trimmed on installation. Arc length "ab" is a more reliable measurement.
 (b)  The tool must be parallel to the fuselage and on top of rib number 1.
 S 825-030
 (3)  Measure the clearance dimension between the lower edge of the tool's straightedge and the aft end of the panel's upper surface (Fig. 501):
 NOTE: There are four possible conditions for fuel loading.
____ Make sure that you know which condition is applicable during this measurement. Refer to the applicable table below.
 (a)  
Use the rigging beam tool with the following guidelines: 1) The "MIN" and "MAX" lines on the tool scale are applicable only to conditions 1 and 2 in the table below.

 2)  You can measure the clearance dimension for conditions 3 and 4 with a caliper gage.

 (b)  
If you use the straightedge (12 ft) with the spacers, use a caliper gage to measure the clearance dimensions for all four conditions.

 S 225-018
 (4)  Make sure the dimension in view A-A is as follows:
 NOTE: Empty fuel tanks can contain fuel that can not be used.
____ Airplane fuel loading must be symmetrical on left and right sides.
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A
747-400
MAINTENANCE MANUAL

 S 825-032
 (5)  If you will use the rigging beam tool, the table below is applicable:
 ~............................................................................... | FUEL LOAD TABLE FOR CLEARANCE DIMENSIONS AT SECTION A-A | | (RIGGING BEAM TOOL) | | LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE | ................................................................................. | CONDITION | RESERVE | NO. 1 | NO. 2 | CENTER | CLEARANCE DIMENSION | | NUMBER | TANKS | TANKS | TANKS | TANK | /INCHES/ *[2] | ................................................................................. | 1 | EMPTY | EMPTY | EMPTY | EMPTY | 2.65 + 0.10/-0.05 | | 2 | EMPTY | EMPTY | *[1] | *[1] | 2.65 + 0.10/-0.05 | | 3 | EMPTY | FULL | *[1] | *[1] | 2.85 + 0.10/-0.05 | | 4 | FULL | FULL | *[1] | *[1] | 2.90 + 0.10/-0.05 | 2............…...........….........…..........…..........…......................1 *[1] THESE TANKS CAN BE EMPTY, OR CAN CONTAIN SOME FUEL OR A FULL LOAD OF FUEL. *[2] THIS DIMENSION INCLUDES THE 2.0 INCH HEIGHT OF THE TOOL.
　
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