Honeywell MCP
Mode Control Panel
Master (MA) Flight Director Indicators

If a F/D switch is ON, the MA (Master) light indicates which FCC is
controlling the F/D modes.

  • Illuminated – related FCC is controlling F/D modes.
  • Extinguished – F/D modes are controlled from the opposite
    FCC
  • Both lights illuminated – each FCC is controlling modes for
    the related F/D.