(a)
Remove lockwire and turn knurled thumbnut on microadjustment rod until resistance measured is zero index resistance. Lockwire thumbnut to microadjustment rod and check that resistance is within 士10 ohm tolerance (Fig. 501).
(b)
Loosen two potentiometer clamp screws enough to allow position potentiometer housing to be rotated. Rotate potentiometer housing slowly until resistance deviation from zero index is less than 士40 ohms. Tighten clamp screws to 40-50 pound-inches torque, being careful not to disturb adjustment. Perform step (a) for fine adjustment.
(7)
Remove rigging pin.
(8)
Remove test receptacle and replace electrical receptacle.
(9)
Replace access door.
Oct 20/91 22-11-101 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G42384
Stabilizer Trim Potentiometer Installation 500
22-11-101Page 502 Figure 501 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/91
STABILIZER TRIM POTENTIOMETER - REMOVAL/INSTALLATION
EFFECTIVITY
SA ZS-SIA and on GJ B-2509 and B-2510
1. General (Fig. 401)
A. Stabilizer trim potentiometer is mounted above the feel computer, next to the stabilizer jackscrew.
2. Remove Stabilizer Trim Potentiometer
A. Remove access door 3701 (Ref Chapter 12, Access Doors and Panels).
B. Disconnect potentiometer electrical connector.
C. Loosen nut on potentiometer crank bolt and remove crank from potentiometer shaft.
D. Loosen two screws in clamp and remove potentiometer.
3. Install Stabilizer Trim Potentiometer
A.
Set horizontal stabilizer at 0 degrees, equal to B dimension of 41.57 士0.01 inches (Ref Chapter 27, Horizontal Stabilizer Trim Control System).
B.
Align index marks on potentiometer housing and shaft.
C.
Install potentiometer with index mark in vertical position pointing upward.
D.
Tighten two screws in clamp to 40 to 50 pound-inches torque.
E.
Without disturbing position of potentiometer, install crank on potentiometer shaft.
CAUTION: ENSURE THAT THE POTENTIOMETER CRANK IS CORRECTLY ORIENTED AS SHOWN IN FIG. 401 FOR PROPER AUTO STABILIZER TRIM OPERATION. DAMAGE TO CRANK COULD RESULT IF INSTALLED IN AN INCORRECT ORIENTATION.
F. Tighten nut on potentiometer crank bolt to 12 to 20 pound-inches torque.
G. Adjust and test potentiometer (Ref Stabilizer Trim Potentiometer - A/T).
H. Replace access door.
Oct 20/87 22-11-102 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H19304
Stabilizer Trim Potentiometer Installation 580
22-11-102Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/80
STABILIZER TRIM POTENTIOMETER - ADJUSTMENT/TEST
EFFECTIVITY
SA ZS-SIA and on SD ST-AIB and on WA N235WA-N241WA GJ B-2509 and B-2510
1. Stabilizer Trim Potentiometer Adjustment (Fig. 501)
A. Equipment and Materials
(1)
Breakout Cable - P/N F80217-7.
(2)
Rigging Pin E3 - 0.309 +0.003/-0.000-inch diameter (MS20392-4)
(3)
Wheatstone Bridge - Model 5430-A, Leeds and Northrup
B. Adjust Stabilizer Trim Potentiometer
(1)
Remove access door 3701 (Ref Chapter 12, Access Doors and Panels).
(2)
Set horizontal stabilizer at 0 degrees, (3 units trim) equal to B dimension of 41.57 士0.01 inches (Ref Chapter 27, Horizontal Stabilizer Trim Control System).
(3)
Install rigging pin E3.
(4)
Open autopilot AC circuit breakers on P6 and P18 panels.
(5)
Disconnect electrical connector and install breakout cable on trim potentiometer.
(6)
Connect Wheatstone bridge to test leads 22 (TJ3) and 23 (TJ4) (System A) or 16 (TJ5) and 17 (TJ4) (System B).
(7)
Measure resistance with respect to zero index resistance stamped on potentiometer nameplate. Check that deviation is less than 士10 ohms. If deviation is less than 士40 ohms, adjust per step (a). If deviation is greater than 士40 ohms, adjust per step (b).
(a)
Remove lockwire and turn knurled thumbnut on microadjustment rod until resistance measured is zero index resistance 士10 ohms. Lockwire thumbnut to microadjustment rod.
(b)
Loosen two potentiometer clamp screws enough to allow potentiometer housing to be rotated. Rotate potentiometer housing slowly until resistance deviation from zero index is less than 士40 ohms. Tighten clamp screws to 40-50 pound-inches torque, being careful not to disturb adjustment. Perform step (a) for fine adjustment.
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