(b)  Stabilizer Trim Forward Mechanism Chain
1)  With cables properly adjusted, chain tension requirements are met when a perpendicular force of 5 pounds to the chain produces a deflection of 0.25 +
0.07 inch per method and conditions defined in par. 2.D.(3).
(c)  Stabilizer Trim Position Indicator
1)  With stabilizer B dimension (Fig. 501) at 41.57 + 0.05 inches, stabilizer position indicator indicates 3 + 1/4 units trim. If not, this condition may be met by repositioning the flexible drive shaft (l, Fig. 502) per par. 2.D.(7).
B.  Equipment and Materials
(1)  
Tensiometer - 0- to 400-pound capacity

(2)  
Actuator Trammel Bar - F80055-1

(3)  
Spring Scale - 0- to 60-pound capacity

C.  Prepare for Adjustment
(1)  Remove stabilizer forward mechanism access panel 1103.
D.  Adjust Stabilizer Trim System
(1)  
Manually operate stabilizer to full AIRPLANE NOSEDOWN position (stabilizer leading edge up). Make sure stabilizer jackscrew upper stop is contacted, then check that forward drum has approximately 4-1/2 wraps of STB cable from top of drum and approximately 28-1/2 wraps of STA cable from bottom of drum (Fig. 502).

CAUTION:  DO NOT OPERATE STABILIZER ELECTRICALLY UNTIL LIMIT SWITCHES HAVE BEEN INSTALLED AND RIGGED.

(2)  
If new cables are installed:

(a)  
Loosen chain by adjusting forward support link (5, Fig. 502) and aft support link (2).

(b)  
Tighten forward turnbuckle (4), to obtain cable tension of 350 +50 pounds. Run stabilizer system through one full cycle. Center cables on drums and check cable tension. Repeat step till tension of 350 +50 pounds is maintained.

(c)  
Cycle system 5 times at 350 +50 pounds.

(3)  
Check and adjust cable and chain tension.

(a)  
Operate system until STA and STB cables have approximately same number of turns on forward drum.

(b)  
If new cables are installed, loosen chain by adjusting forward and aft support links, and proceed to step (d).

(c)  
If new cables are not installed: 1) Check cable tension with tensiometer and compare to temperature tension chart

(Table 1, Fig. 501). 2) If tension is as required, proceed to step (e). 3) If tension is not as required, loosen chain by adjusting forward support link (5,
Fig. 502) and aft support link (2) and proceed to step (d).
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27-41-0 Page 504  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/92 

(d)  
Adjust turnbuckle (4, Fig. 502) until rigging load as shown in temperature chart (Table 1, Fig. 501) is obtained. Lockwire turnbuckle.

NOTE:  Minimum turnbuckle length is 9.5 inches between attachment bolts. If proper adjustment cannot be achieved, shorten cable by cutting off old terminal and swaging on a new terminal with same part number using portable equipment. A GO/NO-GO gage may be used in lieu of pull testing.

(e)  
Apply a 5-pound force perpendicular to chain assembly approximately 4.5 +1.0 inches along chain from tangency of chain and forward trim mechanism sprocket (3, Fig. 502). Check for 0.25 +0.07-inch lateral deflection of chain assembly.

(f)  
Measure eyebolt thread extension or dimension A to adjust support linkage for the required amount of chain deflection. 1) Measure eyebolt thread extension.

a)  On forward support link, measure length of eyebolt thread extension above the adjustable nuts. b) On aft support link, measure length of two eyebolts thread extension below the adjustable nuts. c) Make sure that the three thread extensions are the same within 0.12 inch. 2) Measure the A dimensions of the support links: a) On the aft support links, measure from the center of the aft support bolts to the threaded stud on the left and right aft support links. b) On the forward support link, measure from the center of the mounting bolt to the center the bolt through the lower end of the eyebolt. c) Make sure the 3 dimensions are the same within +0.06 inch.

(g)  
Manually operate stabilizer through full travel in each direction. Center cables on forward drum and check cable tension. Repeat step (3) as required until correct rigging load is obtained. Lockwire as required.

(4)  
Manually operate stabilizer to full AIRPLANE NOSEUP position (stabilizer leading edge nose down). Make sure stabilizer jackscrew lower stop is contacted. 

(5)  
Adjust cable-grommet clearance.

(a) Check that clearance between cable STA and forward grommet is per Detail C, Fig.
501.
　
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