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2)  Ensure that horizontal stabilizer B dimension is set at 41.57 士0.05 inches and that mach trim actuator is in null position per 27-31-0, MP. 3) Hold right elevator with trailing edge aligned with index mark on tail cone
(detail A, Fig. 505). 4) Check that left elevator trailing edge aligns with index mark on tail cone within
0.12 inch.
(b)  If elevators or the output torque tube have been replaced, or if the elevators are not synchronized at neutral, see Fig. 505 and proceed as follows: 1) Install rigging pin E-5 in aft control quadrant. 2) Remove right power control unit using the procedures given in 27-31-101, R/I. 3) Install rigging and restraining tool in place of right power control unit. 4) Check that right elevator trailing edge aligns with index mark on tail cone within
0.12 inch.
5)  If elevator does not align, release locknuts and remove bolt attaching forward end of right elevator control pushrod to output torque tube crank.
CAUTION:  DO NOT PERMIT INNER RACE OF OUTPUT TORQUE TUBE CRANK BEARING TO ROTATE TO A POSITION WHERE ROLLERS MAY DROP OUT THROUGH HOLE IN INNER RACE.
6)  Back off checknut and adjust rod end fitting. Right elevator trailing edge must align with index mark on tail cone within 0.12 inch with control pushrod bolt installed.
NOTE: One-half turn of rod end fitting equals 0.2 inch at elevator trailing edge.
500 
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G08712
Elevator Control Pushrod Adjustment  500 
27-31-0  Figure 505  Oct 20/84 
Page 510 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

7)  Check that left elevator trailing edge aligns with index mark on tail cone within
0.12 inch. 8) If elevator does not align, release locknuts and remove bolt attaching forward end of left elevator control pushrod to output torque tube.
9)  Back off checknut and adjust rod end fitting. Left elevator trailing edge must align with index mark on tail cone within 0.12 inch with control pushrod bolt installed.
10)  Check that mismatch between left and right elevators does not exceed 0.12 inch. If necessary, readjust right elevator control pushrod to obtain this requirement.
11)  Grease checknut threads, then tighten checknuts on left and right control
pushrod end fittings 750 to 900 pound-inches, and lockwire. 12) Install bolt securing elevator control pushrods to output torque tube. 13) Install first locknut and tighten 500 to 600 pound-inches, then install second
locknut and tighten 150 to 220 pound-inches.
CAUTION:  AFTER SETTING TORQUE ON SECOND LOCKNUTS, DO NOT ATTEMPT TO RESET TORQUE ON FIRST LOCKNUTS.
14)  Remove rigging and restraining tool and install power control unit.
(c)  Adjust elevator power control unit input rod per par. C.(3).
(3)  Adjust Elevator Power Control Unit Input Rod
NOTE:  Elevator control pushrod adjustment must be satisfactory before proceeding. Gain access to elevator power control unit input rods through tail cone access panels.
(a)  
Ensure that horizontal stabilizer B dimension is set at 41.57 士0.05 inches, that mach trim actuator is in null position per 27-31-0, MP, and install rigging pin E-5 in aft control quadrant.

(b)  
Provide hydraulic power as follows: 1) Provide elevator systems A and B hydraulic power (Ref 27-31-0 MP). 2) Position flight controls hydraulic system A switch to OFF, leave system B switch

ON.

(c)  
Measure right elevator trailing edge deviation from index mark on tail cone (Fig. 505).

(d)  
Position flight controls hydraulic system B switch to OFF.

(e)  
Loosen checknuts on right power control unit input rod, but do not change rod length. If required, remove rigging pin E-5 and push elevator trailing edge down for access to checknuts, then restore elevator to neutral as follows: 1) Push elevator back to align trailing edge with index mark, position flight controls

hydraulic system B switch to ON, shake control column lightly fore and aft to ensure system is centered, then release. Position flight controls hydraulic system B switch to OFF, and install rigging pin E-5.

(f)  
If deviation is less than 0.4 inch, proceed to step (g) for fine adjustment. If deviation is greater than 0.4 inch, carry out coarse adjustment as follows: 1) Check that flight controls hydraulic system B switch is positioned to OFF.

501 
Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-31-0 Page 511 

WARNING:  HYDRAULIC POWER MUST BE OFF BEFORE DISCONNECTING INPUT ROD.
2)  Disconnect lower end of input rod from quadrant crank (Fig. 506).
　
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