(3)  
With horizontal stabilizer B dimension set at 41.57 士0.05 inches and the mach trim actuator in the null position per 27-31-0, MP, the elevator and tab control system will be adjusted correctly when the following conditions have been satisfied.

NOTE:  The horizontal stabilizer B dimension tolerance requirement is士0.04 inch for neutral shift mechanism input rods and 士0.01 inch for feel computer input rod.
(a)  Elevator Control Cables EA and EB and Pitch Force Transducers
1)  With rigging pin E-5 installed and easily movable, rigging pins E-1, E-2 and E-3 shall fit easily, cable tension shall be within limits specified in Fig. 501 and pitch force transducer signals shall be as specified in Chapter 22, Pitch Control Wheel Steering Force Transducer - Adjustment/Test. These conditions may be met by adjusting turnbuckles in aft unpressurized compartment per par. C.(1) or adjusting pitch force transducers per instructions in Chapter 22.
500 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-31-0 Page 501 

G08681G08703
Elevator Tab Control System Adjustment  500 
27-31-0  Figure 501 (Sheet 1)  Jun 20/84 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Elevator and Tab Control System Adjustment 
May 01/99  Figure 501 (Sheet 2)  27-31-0 
Page 502A 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(b)  Elevator Control Pushrods
NOTE:  This step is required if elevators or the output torque tube have been removed; or if the elevators are not synchronized at neutral.
1)  With right elevator trailing edge held aligned with tail cone index mark, left elevator trailing edge should align with index mark within 0.12 inch. Alignment may be obtained by adjusting elevator control pushrod per par. C.(2).
(c)  Elevator Power Control Unit Input Rod
1)  With rigging pin E-5 installed and hydraulic system B pressurized, right elevator trailing edge should align with index mark on tail cone within 0.06 inch. Alignment may be obtained by adjusting right power control unit input rod per par. C.(3).
2)  With rigging pin E-5 installed and hydraulic system A pressurized, right elevator trailing edge should align with index mark on tail cone within 0.06 inch. Alignment may be obtained by adjusting left power control unit input rod per par. C.(3).
3)  With rigging pin E-5 installed and hydraulic system A and system B pressurized, synchronized operation of the power control units may be verified by alternately switching each system off. Elevator trailing edge shall not deviate more than
0.02 inch. This condition may be met by adjusting input rod per par. C.(3).
(d)  
Neutral Shift Mechanism Input Rods

1)  Dimension between neutral shift crank and bulkhead should be 1.25 士0.03 inch. Correct dimension may be obtained by adjusting neutral shift input rods per par. C.(4).

(e)  
Feel and Centering Unit Output Rod

1)  With rigging pin E-5 installed, lower bolt hole in feel and centering unit output rod should align with bolt hole in aft control quadrant crank. Alignment may be obtained by adjusting feel and centering unit output rod per par. C.(5).

(f)  
Elevator Tab Pushrods

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27-31-0 Page 502B  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/84 

1)  With elevator hydraulic system A and B depressurized and with elevator trailing edge aligned with index mark on tail cone, tab trailing edge should be displaced
0.22 士0.01 (0.24 士0.01 composite elevator) inch up from elevator trailing edge. Displacement may be obtained by adjusting tab dual pushrods per par. C.(6).
2)  With elevator hydraulic system A pressurized and with left elevator trailing edge aligned within 0.06 inch of index mark on tail cone, left tab trailing edge should align with left elevator trailing edge within 0.03 inch. With elevator hydraulic system B pressurized and with right elevator trailing edge aligned within 0.06 inch of index mark on tail cone, right tab trailing edge should align with right elevator trailing edge within 0.03 inch. Alignment may be obtained by adjusting tab dual pushrods per par. C.(6).
(g)  Feel Computer Input Rod
1)  Rigging pin E-4 should fit easily through rig pin holes in computer input arm and feel computer housing. Alignment of parts may be obtained by adjusting input rod per par. C.(7).
B.  Equipment and Materials
(1)  
Tensiometer - 0 to 320 pounds capacity

(2)  
Scale - 0 to 2 feet, graduated in inches and hundredths of an inch
　
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