Flight Control Computers

Elevator Aileron Computers

ELAC - Normally ELAC 1 commands the operation of the ailerons and ELAC 2 commands the operation of the elevators and horizontal stabilizer. ELAC 1 and 2 perform the following:

  • Normal pitch and roll, normal LAF
  • Alternate pitch, alternate LAF
  • Direct pitch and roll
  • Aileron droop
  • Abnormal attitude
  • Acquisition of autopilot orders

ON - When the associated flight control computer switch is ON, it engages the computer and lights are extinguished.

OFF - When selected to OFF, the OFF light illuminates white and disengages the associated computer.

RESET - Turning the computer OFF then ON resets the computer.

FAULT - The associated FAULT Light illuminates amber:

  • When a failure is detected
  • During computer's power-up test (8-second duration). This test occurs for each flight control computer upon electrical power application or after electrical transient/interruption.

The FAULT light extinguishes when OFF is selected or at completion of satisfactory power-up test.