34-24-00  RADIO MAGENTIC INDICATOR Back

A. System Function

The Radio Magnetic Indicator (RMI) system gives the flight crew an indication of the:
  • Aircraft heading
  • VHF Omni-directional radio Range (VOR) bearing to a ground transmitter
  • Automatic Direction Finder (ADF) bearing to a ground transmitter
  • Direction Finder (DF) bearing to a transmission source

B. System Operation (Ref. Fig. 1 and Fig. 2)

(1) Each RMI gets inputs of the:
  • Aircraft heading from the Attitude and Heading Reference System (AHRS) (Ref. 34-25-00)
  • VOR bearing from the VOR/ILS/marker system (Ref. 34-54-00)
  • ADF bearing from the ADF system (Ref. 34-51-00)
  • DF bearing from the DF system (Ref. 95-30-00)
(2) The RMI uses these inputs to show the:
  • Aircraft heading
  • VOR bearing to a ground transmitter
  • ADF bearing to a ground transmitter
  • DF bearing to a transmission source

ATA imageATA image