(m)
Disconnect the VTVM.
(n)
Disconnect the test cable from J-3 (A SENSOR) to the aileron position sensor.
S 725-015
(2) Do a test on the autopilot B aileron axis:
(a)
Connect a -4 test cable from J-4 (B SENSOR) on the test set to the aileron position sensor.
(b)
Connect the VTVM to the LVDT FEEDBACK - B J10B and J11B.
(c)
Connect the other VTVM to the NSS FEEDBACK - B J7B and J8B.
(d)
Set the switches on the test set as follows: 1) LVDT FEEDBACK - A OFF, B ON 2) LVDT EXCITATION - A OFF, B ON 3) SOLENOID EXCITATION - (PISTON and ENGAGE), A OFF, B ON 4) NSS EXCITATION - A OFF, B ON 5) NSS FEEDBACK - A OFF, B OFF 6) CURRENT SELECT - B T-VALVE 7) SOLENOIDS ON/OFF (Center Switch) - ON 8) A&B SOLENOID - A NORM, B NORM 9) ACTUATOR SELECT - B ONLY 10) POWER - ON
(e)
Make sure that these lights are on:
1) SOLENOID EXCITATION - PISTON and ENGAGE - B
2) LVDT EXCITATION - B
3) NSS EXCITATION - B
4) POWER
NOTE: All other lights must be OFF.
____
(f) Use the POSITION CONTROL B switch to set up the test conditions as shown below.
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(g) Make sure that the right aileron positions are in the tolerances as shown below.
~........................................................................... | | | Right | Aileron | | Test | LVDT Output | Aileron | Sensor Output | | Condition | (J10B and J11B) | Position *[1] | (J7B and J8B) | .............................................................................
| Minimum | | | |
| Command | Null (80 MV Max) | 0 |0.03" | 60 MV Max |
| Signal | | | |
............................................................................. | Up Aileron | 5.0 |0.03 Volts | 1.00 |0.10" | 1.85 |0.25 Volts | | Signal | | (5.00 |0.50°) | | ............................................................................. | Down Aileron | 5.0 |0.03 Volts | 1.00 |0.10" | 1.85 |0.25 Volts | | Signal | | (5.00 |0.50°) | | 2..............…..................…...................….....................1
*[1] Linear measurements are between point "A" (center of the index plate on the structure) and point "B" (center of the index plate on the inboard end of the aileron).
(h) Set the POSITION CONTROL B to the Minimun Command position.
S 725-016
(3) Do a test on the autopilot dual channel:
(a) Set the switches on the test set as follows:
1) LVDT FEEDBACK - A ON, B ON
2) LVDT EXCITATION - A ON, B ON
3) SOLENOID EXCITATION - A: (PISTON and ENGAGE) ON
4) SOLENOID EXCITATION - B: PISTON ON, ENGAGE OFF
5) NSS EXCITATION - A OFF, B OFF
6) NSS FEEDBACK - A OFF, B OFF
7) CURRENT SELECT: A T-VALVE
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737-300/400/500MAINTENANCE MANUAL
8) SOLENOIDS ON/OFF (Center Switch): 9) A&B SOLENOID - A NORM, B NORM 10) ACTUATOR SELECT: A ONLY 11) POWER: ON ON
(b) Make sure that these lights are ON: 1) SOLENOID EXCITATION - PISTON and ENGAGE - A 2) SOLENOID EXCITATION - PISTON - B 3) LVDT EXCITATION - A and B 4) POWER
NOTE:____ All other lights must be OFF.
(c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) Turn the POSITION CONTROL A switch until the trailing edge of the right aileron moves down to 1.00 |0.10 inches (5.00 |0.10 degrees). Lock the POSITION CONTROL A switch in its position. Keep a record of the aileron position.Connect the VTVM to the LVDT FEEDBACK - A J10A and J11A. Keep a record of the voltage.Set the SOLENOID EXCITATION ENGAGE A switch to the OFF position.Set the ACTUATOR SELECT switch to the B ONLY position.Set the SOLENOID EXCITATION ENGAGE B switch to the ON position.Connect the other VTVM to the LVDT FEEDBACK - B J10B and J11B.Adjust the POSITION CONTROL B switch until the VTVM reads the same voltage as in the step (d) |0.03 volt. Keep a record of the voltage.Make sure that the right aileron is at 1.00 |0.10 inches down position. Keep a record of the aileron position.Set the SOLENOID EXCITATION ENGAGE A switch to the ON position.Set the ACTUATOR SELECT switch to the A & B INDEPENDENT position.Set the SOLENOID B switch to the +HDOVR position.Make sure that the trailing edge of the aileron does not move down more than 0.20 inches. Keep a record of the trailing edge position.
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