(2)  
Remove turnbuckle-locking clips and disconnect turnbuckles located in fuselage lower nose compartment.

(3)  
Identify cables for future installation.

(4)  
Remove cable SBB from quadrant.

D.  Disconnect ratio changer input rod from input crank.
(1)  
Remove bolt attaching input rod to input crank.

(2)  
If a new spoiler ratio changer is to be installed, remove rod end bolt from input rod.

E.  Loosen the rod guard to get access to the mounting bolts that attach the ratio changer.
(1)  
Remove the four bolts that attach the rod guard.

(2)  
Move the rod guard until you can get access to the mounting bolts.

F.  Remove three ratio changer mounting bolts.
G.  Remove three ratio changer mounting bushings.
H.  Remove spoiler ratio changer from airplane.
I.  Remove cable SBA from ratio changer.
J.  Remove the rod guard from the ratio changer input rod.
500 
27-61-31 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/94 

4. Install Spoiler Ratio Changer

A.  Check that ratio changer operates smoothly.
B.  Put the rod guard on the ratio changer input rod.
C.  Position ratio changer in wheel well and attach cable SBA on speed brake input quadrant (Fig. 401).
D.  Place ratio changer on mounting brackets. Install three mounting bushings.
(1)  
Lubricate surface between mounting bushings and mounting bearings with a light coat of grease.

(2)  
Install mounting bushings with shoulder either up or inboard. 

NOTE: Mounting bushings shall fit freely through all mounting bearings.
E.  Secure ratio changer with three mounting bolts.
(1)  
Install mounting bolts with head either up or inboard.

(2)  
Install washer and locknut.

(3)  
Tighten locknut within 50 to 70 pound-inch torque range.

F.  Position rod guard on ratio changer. Secure guard with four bolts and washers.
G.  Attach SBB cable onto speed brake input quadrant (Fig. 403).
H.  Attach right and left wing cables WSAl, WSA2, WSBl and WSB2, to spoiler output quadrant. Rotate quadrant to facilitate installation of cables and cable retainers (Fig. 401).
I.  Install spoiler mixer (Ref 27-61-21 R/I).
NOTE: Adjustment of spoiler mixer output cam is not required at this time.
J.  Install speed brake control cables (Fig. 403).
(1)  
Install rigging pins SB-1 and SB-2 (Fig. 401 and 404).

(2)  
Install cable SBA and SBB turnbuckles in lower fuselage nose compartment.

(3)  
Adjust cable tension per temperature-tension table (Fig. 403).

Aug 01/94 27-61-31 Page 405 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

G33845G33806 G34870
Spoiler Control Cable Turnbuckle Location and Cable Tension  500 
27-61-31  Figure 402  Jun 20/85 
Page 406 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Speed Brake Control System Turnbuckle Locations and Cable Tension 
Aug 15/67  Figure 403  27-61-31 
Page 407 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Speed Brake Forward Drum Rigging Pin Location  500 
27-61-31  Figure 404  Aug 15/67 
Page 408 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(4)  
Check that pressure seals in left wheel well align properly with cables. If not, loosen seal retaining bolts and position seal properly. Tighten bolts.

(5)  
Remove rigging pins SB-1 and SB-2.

(6)  
Check speed brake system for proper rigging as follows:

(a)  
Move speed brake control lever through one complete cycle.

(b)  
Insert rigging pins SB-1 and SB-2.

(c)  
Check that cable tension is within required values on temperature-tension table. Cable tension should be balanced.

(d)  
Remove rigging pins SB-1 and SB-2.

(7)  
Install turnbuckle-locking clips.

K.  Install spoiler control cables. (See figure 402.)
(1)  
Insert rigging pins A/S-8, A/S-9, A/S-10 and A/S-11. (See figure 405.)

(2)  
Insert rigging pins A/S-14 and SB-2. (See figure 401.)

(3)  
　
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