NOTE: ALL DIMENSIONS ARE IN INCHES.
OBTAIN BUSHING. BORE HOLE TO ATTAIN 0.0002 TO 0.0013 INCH INTERFERENCE FIT
(0.3754 INCH MAXIMUM). REAM BUSHING TO 0.2495/0.2505 INCH DIAMETER.
INSTALL NEW 65-51237-4 BUSHING TO MAXIMUM DIAMETER OVERSIZE OF 0.4000.
MATERIAL WIDTH REMAINING BETWEEN EDGE OF HOLE AND OUTER EDGE OF ARM
MUST NOT BE LESS THAT 0.14 INCH.
OBTAIN BUSHING. BORE HOLE TO ATTAIN 0.0002 TO 0.0013 INCH INTERFERENCE FIT
(0.3129 INCH MAX). REAM BUSHING TO 0.1895 TO 0.1900 INCH DIAMETER.
Elevator Feel Computer Wear Limits 500
27-31-131 Figure 601 (Sheet 4) May 15/73
Page 604
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FEEL SYSTEM PITOT TUBE - REMOVAL/INSTALLATION
1. Prepare for Removal
A. Position PITOT HEAT switches on the forward overhead panel to OFF. Tag switches.
CAUTION: ALLOW SUFFICIENT TIME FOR PITOT TUBE TO COOL BEFORE HANDLING, OTHERWISE SERIOUS BURNS MAY RESULT.
B. Remove vertical stabilizer access panel 9525 (Ref Chapter 12).
2. Remove Pitot Tube
A. Disconnect pitot heater electrical connector and pitot air connector from back of pitot tube (Fig. 401).
B. Support pitot tube and remove three mounting bolts.
C. Remove pitot tube and gasket.
D. Install protective cap on pitot air line.
3. Install Pitot Tube
A. Inspect probe (Ref 34-11-11 I/C).
B. To ensure good electrical ground, thoroughly clean area inside vertical fin contacted by pitot tube mounting bolts.
C. Position pitot tube gaskets and wedge on vertical fin (Fig. 401).
D. Apply a bead of RTV 174 adhesive (Ref 20-30-11) around tube tongue, tighten mounting bolts and remove excess sealant.
E. RTV 174 adhesive can be used in place of gasket between pitot tube and wedge.
NOTE: Do not use adhesive in place of gasket between wedge and fin.
F. Remove protective cap and attach pitot air connector to pitot tube.
G. Refit electrical connector to pitot tube.
CAUTION: WHEN MATING CONNECTOR TO PITOT HEATER PINS, CONNECTOR SHOULD BE PUSHED STRAIGHT ON WITHOUT "WALKING," TO AVOID SOCKET ENLARGEMENT.
H. Install access panel.
I. Remove tag from PITOT HEAT switches.
J. Test for pressure leakage in feel pitot system per 27-31-212 A/T.
K. Test pitot heater in accordance with procedure in Chapter 30, Pitot Static and Temperature Probe Anti-icing System - A/T.
500
Oct 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-31-141 Page 401
G10261
Feel System Pitot Tube Installation 500
27-31-141 Figure 401 Feb 20/86
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FEEL AND CENTERING UNIT - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Rigging Pins Kit - F70207-3, -52, -61, or -84:
REF. NO. F70207-( ) DIAMETER (INCHES) LENGTH (INCHES) FUNCTION
E-5 -11 0.309 - 0.311 6.7 + 0.25 Aft Control Quadrant
B. Trammel Bar - F80055-1
2. Prepare for Removal
A. Open aft compartment access door 3701 and remove tail cone access panel 3802.
B. Remove elevator systems A and B hydraulic power (Ref. 27-31-0 MP).
C. Install rigging pin E-5 in aft control quadrant.
3. Remove Feel and Centering Unit (Fig 401)
A. Remove two mounting bolts attaching feel actuator (3) to feel and centering unit (2). Tie feel actuator to adjacent structure to avoid damage to flexible hydraulic lines.
B. Disconnect feel and centering unit output rod (5) from aft control quadrant crank (4).
C. Remove mach trim actuator (1) from feel and centering unit (Ref. Chap. 22, Mach Trim Actuator
-R/I).
D. Disconnect microadjustment rod (9) from feel and centering unit.
E. Remove four bolts securing each bearing assembly (7) to feel and centering unit support bracket (8).
F. Remove feel and centering unit from airplane. Remove retainer nut, bearing housing assembly (7), and output crank (6) with feel and centering unit output rod (5) attached from feel and centering unit shaft, and retain for installation with new feel and centering unit.
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