R.  Remove cable clamp STB and connect STB cable (17) to drum.
NOTE:  A 50-pound load may be applied to stabilizer trim control wheel to stretch STA cable to facilitate attachment of STB cable.
(1)  
Wrap cable 3 turns on drum. This will fill drum so that only the 1/2 groove between STA and STB cables is empty.

(2)  
Insert cable terminal into upper terminal slot of drum.

(3)  
Install lockwire to secure terminal. Insert ends of lockwire into terminal slot.

S.  Install cable guards.
(1)  
Secure aft cable guard (23) to jackscrew gearbox with two bolts, nuts, and washers.

(2)  
Locate four forward cable guards (26) on support plate (25) and secure to jackscrew gearbox with bolts, nuts, and washers.

(3)  
Attach aft cable guard to support plate with bolt, nut, and washer.

NOTE:  Make sure the bearing assembly of the support plate is on the same side as the cable drum.

(4)  
Carefully tighten the central retaining nut by hand and secure with cotter pin.

T.  Adjust stabilizer trim cables STA and STB.
(1)  
Adjust turnbuckle (11, Fig. 402) on forward mechanism to remove slack from cables.

(2)  
Operate manual control wheel until STA and STB cables have approximately the same number of turns on forward cable drum (7).

(3)  
Adjust turnbuckle to tension cables per tension chart in Fig.402.

U.  Adjust stabilizer trim chain
(1)  
Adjust forward mechanism aft support links (4) to tension chain (14) so that chain will deflect as follows:

(a)  Apply 5-pound force perpendicular to chain at chain deflection force point (l3) (4.5 +1.0 inches along chain from tangency of chain and forward trim mechanism sprocket (9)). Check that deflection of chain is 0.25 +0.07 inch.

(2)  
Check that dimension A of support link assemblies are equal to within 0.06 inch of each other (measure at 3 places) to ensure proper alignment of forward mechanism.

NOTE:  Measurement is taken from center of aft support bolts and threaded stud on aft support link assembly (right and left side) and center to center of forward support link mounting bolts and bolt through lower end of eyebolt.
502 
Apr 01/97  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-41-81 Page 409 

G42424G42427 G10906
Forward Mechanism Adjustment  501 
27-41-81  Figure 402 (Sheet 1)  Feb 20/91 
Page 410 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Forward Mechanism Adjustment 
Feb 20/90  Figure 402 (Sheet 2)  27-41-81 
Page 411 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Stabilizer Trim Jackscrew Setting  500 
27-41-81  Figure 403  May 15/68 
Page 412 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

V.  Manually operate stabilizer through full travel in both directions. Center cables and check cable tension. If cable tension requires adjustment, remove tension from chain and repeat steps T and U.
W.  Operate stabilizer until B dimension is 41.57 +0.05 inch (Fig. 403).
X.  Check that stabilizer position indicator (1, Fig. 402) is at 3 +1/4 units trim. If not:
(1)  
Disconnect indicator flexible shaft (3) from forward mechanism.

(2)  
Check flexible shaft is lubricated over entire length. If necessary to remove shaft from conduit for lubrication, remove as follows:

(a)  
Unscrew cable housing ferrule nuts from position indicator shaft couplings on each end of housing.

(b)  
Remove cable by pressing out pin holding splined end to flexible shaft on one end and pull cable out from the opposite end.

(c)  
Apply grease to entire length of cable.

(d)  
Install cable into housing and press in pin to hold splined end in place.

(e)  
Tighten cable housing ferrule nuts onto position indicator shaft couplings. Make sure that splines are engaged at both ends before tightening.

(3)  
Rotate flexible drive shaft until stabilizer position indicator is at 3 +1/4 units trim.

(4)  
Connect indicator flexible shaft to forward mechanism. Check for positive engagement of flexible shaft with spline in forward mechanism before tightening nut.

Y.  Remove adapter from gearbox.
Z.  Install electric actuator (18) and autopilot actuator (9) on jackscrew gearbox (Fig. 401).
　
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