G10447
Feel and Centering Unit Installation  551 
27-31-151  Figure 401  May 01/75 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Prepare for Installation
A.  Remove elevator systems A and B hydraulic power (Ref 27-31-0, MP).
B.  Check that rigging pin E-5 is installed in aft control quadrant.
C.  Check for allowable wear at feel and centering unit installation points (Ref 27-31-151, I/C).
CAUTION:  NEUTRAL SHIFT TUBE AND CRANK ASSEMBLY, FEEL AND CENTERING UNIT OUTPUT ROD AND DUAL CONCENTRIC BOLTS ARE DUAL LOAD PATH COMPONENTS. INSPECT INNER AND OUTER RODS/BOLTS FOR DAMAGE PRIOR TO INSTALLATION.
D.  Adjust neutral shift linkage per 27-31-0, A/T.
E.  Assemble output crank (6) to feel and centering unit as follows:
(1)  
Line up spline indices on output crank (6) and feel and centering unit shaft and slide crank onto shaft.

(2)  
Install two clamp bolts, nuts, and washers in output arm. Tighten nuts 30 to 40 pound-inches.

F.  Install assembly of bearing and housing over end of shaft on feel and centering unit. Install retainer nut and tighten 150 to 200 pound-inches.
5.  Install Feel and Centering Unit
A.  Position feel and centering unit (2, Fig. 401) on support bracket.
B.  Position feel and centering unit between flanges of mounting bracket and line up bolt
installation holes in bearing housings and bracket.

C.  Install four bolts through each bearing assembly (7) into support bracket (8).
NOTE:  Ensure that short bolts are used in left bearing assembly and long bolts are used in right bearing assembly.
523 
Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-31-151 Page 403 

D.  Install feel actuator (3) on feel and centering unit as follows:
(1)  
With feel actuator (3) positioned beneath feel and centering unit, install both mounting bolts from left to right.

(2)  
Install first locknut on forward bolt and tighten 120 to 140 pound-inches.

(3)  
Install second locknut and tighten 60 to 85 pound-inches.

(4)  
Install first locknut on aft bolt and tighten 85 to 100 pound-inches.

CAUTION:  AFTER SETTING TORQUE ON SECOND LOCKNUTS, DO NOT ATTEMPT TO RESET TORQUE VALUE ON FIRST LOCKNUTS.

(5)  
Install second locknut and tighten 30 to 35 pound-inches.

E.  Install mach trim actuator (1) on feel and centering unit, then set actuator to null position (Ref Chapter 22, Mach Trim Actuator - R/I, and 27-31-0, MP).
F.  Attach micro-adjustment rod (9) on feel and centering unit (neutral shift sensor crank should be up).
G.  Attach feel and centering unit output rod as follows:
NOTE: Install output rod with clevis end up.
(1)  
Visually inspect dual loadpath components for damage prior to installation.

(2)  
Connect output rod (5) to output crank (6) and aft control quadrant crank (4) utilizing dual loadpath bolts, nuts and washers.

(3)  
Tighten nuts 75 to 85 pound-inches.

H.  Check that neutral shift sensor (11) is nulled (Ref Chapter 22, Elevator Neutral Shift Sensor -A/T).
I.  Remove rigging pin E-5 from aft control quadrant.
J.  Move control column fore and aft through full range of travel and check that movement is smooth.
K.  Adjust feel and centering unit output rod (5) per 27-31-0, A/T.
L.  Perform test of feel force system and autopilot authority (Ref 27-31-0, A/T).
M.  Check hydraulic connections at feel actuator for signs of leakage.
6.  Restore Airplane to Normal
A.  Replace access panels and close access doors.
B.  Restore airplane to normal hydraulic configuration (Ref 27-31-0, MP).
C.  Service hydraulic reservoirs, if required (Ref Chapter 12, Hydraulic Servicing).
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27-31-151 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

ELEVATOR FEEL AND CENTERING UNIT - INSPECTION/CHECK
1.  General
A.  This data consists of illustrations and wear limits charts. There will be no procedure given in this section for gaining access to, or removing and replacing the components after inspection for wear. Refer to Component Removal/Installation for this information.
2.  Elevator Feel and Centering Unit Wear Limits

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