(9)
Position test box SELECT switch to CAPT. Measure and record output voltage at static conditions. The output should be no more than 160 mv. Check electrical cable installation to see if null can be lowered by loosening cable a small amount. Tighten cable clamps.
NOTE: Hold transducer level to minimize error in reading. The fine and coarse adjustments should be checked for some threads showing. If voltages recorded prior to installation, equal voltages should be obtained.
(10)
Position test box SELECT switch to F/O. Measure and record output voltage at static conditions. The output should be no more than 160 mv.
(11)
Repeat steps (9) and (10) with SYSTEM A-SYSTEM B switch in the SYSTEM B position. After the steps are completed return the switch to the SYSTEM A position.
(12)
Remove lockwiring from locknuts, fine adjustment nut, and washer tab on adjustable rod end if installed. Adjust course fitting on each force transducer until mounting bolt can be easily inserted. Install bolt, washer, and nut.
NOTE: Coarse adjustment is approximately 0.016 inch per turn. Fine adjustment is approximately 0.006 inch per turn.
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H29052
580 Pitch Force Transducer Adjustment
Feb 20/86 Figure 501 22-11-92
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Pit Transducer Rigging Pin Locations 500
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(13)
Adjust fine adjustment until voltage obtained for each force transducer is within ± 40 mv of the values measured in steps (9) and (10). To ensure transducer is not preloaded, turn coarse adjustment until mounting hole is parallel with mounting hole at opposite end of transducer after each fine adjustment and before taking reading.
NOTE: Use Capt and F/O positions on the test box. If dc analog voltage was recorded on FCC test connectors J6-63, adjusting to equal voltage assures proper null; if test box only is used, more than one null can be obtained.
(14)
Position test box SELECT switch to TOTAL. Indicated voltage should be greater than either individual force transducer null voltage. If indicated voltage is less than either individual force transducer null voltage, transducers are not nulled correctly. Position test box SELECT switch to CAPT or F/O and readjust corresponding force transducer to obtain a new null and then check voltage with test box switch in TOTAL position. Repeat as necessary until an acceptable voltage is obtained.
(15)
Repeat step (14) with the SYSTEM A-SYSTEM B switch in the SYSTEM B position. Return switch to the SYSTEM A position after step is completed.
(16)
Tighten locknut on adjustable sleeve (pressing washer against end cap of transducer), tighten locknut on rod end and install lockwiring.
(17)
Remove rigging pins E2 and E3, and install shoulder bolt, washer, and nut in each quadrant so that bolt head is facing outboard.
(18)
Remove rigging pins E1 and E5 from quadrants.
(19)
Cycle control column several times gradually decreasing to zero.
(20)
Position test box SELECT switch to CAPT and record voltage. Position test box select switch to F/O and record voltage. The voltages must be less than 350 mv.
(21)
Check that difference between CAPT and F/O voltages do not exceed 150 mv.
NOTE: If voltage is excessive, check control quadrant and bearings for structural interference, excess friction in support bearings or links and/or misalignment of links.
(22)
Repeat steps (20) and (21) with the SYSTEM A-SYSTEM B switch in the SYSTEM B position.
(23)
Turn off test box and reconnect force transducers to airplane wiring.
(24)
Close access door.
(25)
Test pitch control wheel steering force transducer.
3. Pitch Force Transducer Test
A. Equipment and Materials
(1) Spring Scale - 0 to 50 pounds, John Chatillon and Sons, Model P-PL-50
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B. Prepare to Test Pitch Force Transducer
(1)
Verify control surfaces are free of obstructions and personnel.
(2)
Provide electrical and hydraulic power.
(3)
Check that hydraulic system A and B switches on P5 panel are positioned to ON and that FLT CONT SYS circuit breaker on P6 load control center is closed.
