34-54-00  VOR ILS MARKER SYSTEM Back

A. System Function

The VHF Omni-Direction Range (VOR)/Instrument Landing Ssytem (ILS)/marker system (VOR/ILS/marker system) is a navigation and landing aid. The VOR/ILS/marker system gives data about the position of the aircraft in relation to the ground navigation and landing aids.

B. System Components

There are two VOR/ILS/marker sub-system. The primary components of the No.1 (No.2) VOR/ILS/marker system are the:
  • No.1 (No.2) integrated navigation unit (Nav Unit) (Ref. Fig. 1)
  • Two VOR/LOC antenna with an antenna coupler (each system uses two antennas amd the coupler) (Ref. Fig. 1)
  • Marker beacon antenna with an antenna coupler (each system uses the antenna and the coupler) (Ref. Fig. 2)
  • Glideslope antenna (each system uses one antenna). (Ref. Fig. 2)

C. System Operation

The VOR/ILS/marker system receives Radio Frequency (RF) signals from the VOR, the ILS (glideslope and localizer) and the marker ground radio. The VOR/ILS/marker systemgets the data from the RF signals. The data is the:
  • VOR angular direction (bearing) from the set ground radio transmitter (ground station)
  • Audio identification of the set ground station
  • Vertical postion of the aircraft , in relation to the centerline of the runway glideslope beam
  • Horizontal position of the aircraft, in relation to the centerline of the runway localizer beam
  • Location of the aircraft above the outer, the center (middle) and the inner marker ground radio transmitters (beacons)

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