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C.  Remove the three housing bolts which attach the gearbox to the support bracket.
4.  Install the Flap Right Angle Gearbox
A.  Put the gearbox on the support bracket (Fig. 401).
CAUTION:  MAKE SURE THAT THE HEAD OF THE RIGHT HOUSING BOLT IS FORWARD. THE BOLT CAN CAUSE DAMAGE TO THE TORQUE TUBE COUPLING SLEEVE RETENTION SCREWS IF INSTALLED INCORRECTLY.
(1)  Install the three housing bolts, washers and nuts to attach the gearbox to the support bracket. Install the head of the right bolt forward. Install the heads of the countersunk bolts aft.
B.  Attach the support bracket, with the gearbox, to the structure with the three mounting bolts, washers and nuts.
NOTE: Make sure the flaps are fully retracted.
C.  With airplane resting on its landing gear check alignment of right angle gearbox output shaft centerline with input shaft of No. 4 or 5 transmission gearbox.
(1)  If preferred alignment checking tool (Ref Equipment and Materials) is used, proceed as follows:
(a)  
Install alignment tool from output shaft of right angle gearbox to input shaft of transmission gearbox. Position alignment tool with end cap (end opposite spring) on transmission gearbox (Fig. 402).

(b)  
Check that cable is within tolerance zone in vertical and horizontal plane.

(c)  
Remove alignment tool between right angle gearbox and transmission gearbox.

574 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-261 Page 401 

Flap Right Angle Gearbox  504 
27-51-261  Figure 401  Feb 20/91 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

G26009
574  Flap Right Angle Gearbox Alignment 
Nov 15/78  Figure 402 (Sheet 2)  27-51-261 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(d)  
Install alignment tool between right angle gearbox and transmission gearbox. Position alignment tool with end cap (end opposite spring) on right angle gearbox.

(e)  
Check that cable is within tolerance zone in vertical and horizontal plane.

(f)  
If cable, with end cap positioned at transmission input shaft or at right angle gearbox output shaft, is not within tolerance zone in vertical and horizontal plane, install a maximum of 0.064-inch shims at each right angle gearbox bolt location to align gearbox.

NOTE: Do not relocate transmission gearbox to align right angle gearbox.
1)  Typical vertical adjustment: Install a 0.032-inch washer under right angle gearbox mounting pad at bolt No. 1 or 3 and a 0.016-inch washer at bolt No. 2 to move cable toward tolerance zone.
2)  Typical horizontal adjustment: Install a 0.016-inch washer under right angle gearbox mounting pad at bolt No. 1 and 3, or bolt No. 2 to move cable toward tolerance zone.
(2)  If optional alignment checking tool (Ref Equipment and Materials) is used proceed as follows:
(a)  
Install alignment tool from output shaft of right angle gearbox to input shaft of transmission gearbox. Position alignment tool with pointer towards transmission gearbox (Fig. 402).

(b)  
Check that tool pointer is within + 0.24 inch in vertical plane or + 0.15 inch in horizontal plane of target center.

(c)  
Remove alignment tool between right angle gearbox and transmission gearbox.

(d)  
Install alignment tool between right angle gearbox and transmission gearbox. Position alignment tool with pointer toward right angle gearbox. Use clamp assembly to stabilize pointer.

(e)  
Check that tool pointer is within + 0.24 inch in vertical plane or + 0.15 inch in horizontal plane of target center.

(f)  
If tool pointer, measured at transmission input shaft or at right angle gearbox output shaft, is more than +0.24 inch in vertical plane or +0.15 inch in horizontal plane from target center, install a maximum of 0.064-inch shims at each right angle gearbox bolt location to align gearbox.

574 
27-51-261 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/78 

NOTE: Do not relocate transmission gearbox to align right angle gearbox.
1)  Typical vertical adjustment: Install a 0.032-inch washer under right angle gearbox mounting pad at bolt No. 1 or 3 and a 0.016-inch washer at bolt No. 2 to move forward end of alignment tool 0.175 inch.
2)  Typical horizontal adjustment: Install a 0.016-inch washer under right angle gearbox mounting pad at bolts No. 1 and 3, or bolt No. 2 to move forward end of alignment tool 0.096 inch.
　
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