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Troubleshooting
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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

For AOG assistance contact:

CRC Montreal (YUL)
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Aileron SVO Test Procedure

Clear control surface travel areas of personnel and objects prior to proceeding with test.

NOTE: Both FCCs operate together to drive each servo. If an autopilot/servo problem is suspected, first test the two FCCs and investigate all nonzero REPORT MODE codes. Be certain both FCCs are operational before replacing any servo.

NOTE: The SVO does not report to the CURRENT FAULTS page, but any faults detected by these diagnostics should be resolved before beginning this procedure.

  1. Check the CURRENT FAULTS page, ADVANCED DIAGNOSTICS page, and troubleshoot. If no faults are present, check the LRU FAULT HISTORY page for intermittent faults and troubleshoot.
  2. Verify the control wheel moves freely in a left/right direction. If not, check the servo mount control linkage. Center the control wheel.
  3. Engage the yaw dampers and the autopilot. Verify that AP engage indicators light, and the control wheel resists forced movement.

    • If the autopilot will not engage, test the FGCs. Refer to (22-10-00) to access the FGS diagnostics pages. Make sure the yaw damper is engaged before the autopilot will engage.
    • If the control wheel moves easily, verify that +28 VDC is applied from FGC P2-k to SVO pin P1-E (AIL ENG CLUTCH) while the autopilot is engaged. If not, check airplane wiring and test the FCP.

  4. Select HDG mode on FCP, then turn the HDG knob clockwise. Verify that the control wheel moves right. Push the heading SYNC button, verify the heading bug moves to the lubber line and the control wheel returns to center. The ailerons should respond accordingly. If test fails, check the servo mount control linkage and the airplane wiring. If linkage and wiring are correct, replace the aileron SVO.
  5. Disengage the autopilot. Verify that the control wheel moves freely.
  6. An alternate way to test the aileron SVO is provided below.

Modify the FGC Servo Outputs Control of the FCS outputs is only possible when both channels of the FCS are receiving a valid IAS of under 60 knots, on-the-ground logic, and flight guidance panel control of diagnostics is enabled for both channels.

  1. Disengage the autopilot.
  2. Set the CCP MFD Control switch to R.
  3. On the cursor control panel, push the A/ICE, ECS, and FLT pushbuttons at the same time.
  4. The Diagnostic Entry page screen shows on the copilot MFD. This is the main FGC diagnostic page.
  5. Push and hold left (or right) FD switch then push two mode FGP switches at once. A yellow TEST shows on pilot (or copilot).
  6. Push two mode switches on the FGP to show OUTPUT mode.
  7. Push XFR on the FGP.
  8. Push the right FD and two more switches on the FGP.
  9. Push two mode switches on the FGP to show OUTPUT mode. The word "MODIFY" shows as a column heading. If the active (cursor) line can be modified, then the word EITHER or BOTH show on the cursor line in the MODIFY column.
  10. Set the 65APMN, 65YDMN, 86APEN, and 86YDEN parameters to TRUE. This sets the FGC internal monitors to a valid condition.
  11. Set the AILCUT, ELECUT, and RUDCUT parameters to FALSE. This sets the FGC cutout logic so that the system can engage.
  12. Engage the yaw damper and autopilot.
  13. Select the AILCMD, ELECMD, or RUDCMD.

    WARNING: ADJUSTING THE SERVO COMMAND VOLTAGE CAUSES THE CONTROL SURFACES TO MOVE.

  14. Push left or right FD switch (one side goes up, the other goes down) on the FGP to change the servo command voltage. The control wheel (or control column/rudder pedals) move as the servo runs.

    NOTE: Only change servo command voltage enough to verify servo and/or flight control surface movement.

    NOTE: The MN and CUT parameters must remain set as described above or the system will not engage.

    NOTE: The AILCUT, ELECUT, and RUDCUT outputs cannot be set to FALSE if the FGC I/O processor sets them to TRUE.

    NOTE: The 65APMN, 86APEN, 86YDEN must be true, and AILCUT, ELECUT, RUDCUT must be false, to engage.

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