Flight Control Computers

Flight Augmentation Computers

FAC - The Flight Augmentation Computers have three main functions:

  • Rudder trim
  • Rudder travel limits
  • Yaw damping inputs
  • Alternate yaw
  • Flight envelope and speed computations
  • Wind shear detection

When both FACs are operational, FAC 1 is primary, and FAC 2 is standby.

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

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

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