(20)
Connect VTVM to LVDT FEEDBACK - A, jacks J10A and J11A. Record VTVM value.
(21)
Set SOLENOID EXCITATION ENGAGE A switch to OFF.
(22)
Set ACTUATOR SELECT switch to B ONLY.
(23)
Set SOLENOID EXCITATION ENGAGE B switch to ON.
(24)
Connect second VTVM to LVDT FEEDBACK - B, jacks J10B and J11B.
(25)
Operate POSITION CONTROL - B knob until VTVM value across J10B and J11B is within
0.03 volts of value across J10A and J11A noted in Step 20. Record VTVM value.
(26)
Check that right aileron is at 1.00 +0.10 inches down position. Record actual position.
(27)
Set SOLENOID EXCITATION ENGAGE A switch to ON.
(28)
Set ACTUATOR SELECT switch to A & B INDEPENDENT.
(29)
Set SOLENOID B switch to +HDOVR. Check that trailing edge of aileron does not move up at all or does not move down more than 0.20 inches. Record actual travel.
NOTE: +HDOVR signal generates a right aileron down movement.
(30)
Set SOLENOID B switch to -HDOVR. Check that trailing edge of aileron returns to within +0.23 inches of zero position. Record actual position. (Plus direction is right aileron up from zero position.)
NOTE: "Zero position" is defined as the point when center of index plate on inboard end of aileron is aligned with center of index plate on structure.
(31)
Set SOLENOID B switch to B NORM. Check that right aileron returns to 1.00 +0.20 inches down position. Record actual position.
(32)
Set SOLENOID A switch to +HDOVR. Check that trailing edge of aileron does not move up at all or does not move down more than 0.20 inches. Record actual travel.
(33)
Set SOLENOID A switch to -HDOVR. Check that trailing edge of aileron returns within +0.23 inches of zero position. Record actual position.
(34)
Set SOLENOID A switch to A NORM. Check that right aileron returns to 1.00 +0.20 inches down position. Record actual position.
(35)
Set SOLENOID EXCITATION ENGAGE A and ENGAGE B switches to OFF.
(36)
Operate POSITION CONTROL A knob until voltage across J10A and J11A is at lowest reading (A actuator at null). Record VTVM value.
(37)
Operate POSITION CONTROL B knob until voltage across J10B and J11B is at lowest reading (B actuator at null). Verify value is within 0.045 volts of value across J10A and J11A. Record VTVM value.
(38)
Set SOLENOID EXCITATION ENGAGE A and ENGAGE B switches to ON. Check that right aileron is within 0.03 inches of zero position.
(39)
Set SOLENOID EXCITATION ENGAGE A switch to OFF then ON. Check that ailerons remain in zero position.
(40)
Set SOLENOID EXCITATION ENGAGE B switch to OFF then ON. Check that ailerons remain in zero position.
(41)
SIMULTANEOUSLY set SOLENOID A switch to +HDOVR and SOLENOID B switch to -HDOVR. Check that ailerons do not move more than 0.20 inches. Record actual travel.
(42)
Set SOLENOID A switch to A NORM and SOLENOID B switch to B NORM. Check that ailerons return to within 0.03 inches of zero position.
(43)
SIMULTANEOUSLY set SOLENOID A switch to -HDOVR and SOLENOID B switch to +HDOVR. Check that ailerons do not move more than 0.20 inches. Record actual travel.
(44)
Set SOLENOIDS ON/OFF (Center Switch) to OFF.
(45)
Set POWER switch to OFF.
(46)
Turn OFF hydraulic systems A & B.
(47)
Disconnect and remove test equipment.
(48)
Reconnect airplane wiring to autopilot actuators and aileron position sensor.
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2. A/P Aileron Actuator Test
A. Prepare to Test
(1)
Provide electrical and hydraulic power.
(2)
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.
(3)
Check that all autopilot, attitude, compass and air data systems circuit breakers on P6 and P18 load control centers are closed.
B. Test Actuator
(1)
Place autopilot A (or B as applicable) engage switches to CWS. Observe that CWS ROLL and CWS PITCH is annunciated. Verify that control wheel does not jump when system is engaged.
(2)
If excessive wheel jump, disengage autopilot, repeat rigging check, then repeat step (1).
(3)
Rotate control wheel left; note increase in pressure required to move control wheel and check that left aileron goes up.
(4)
Rotate control wheel to right and check that right aileron goes up.
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