-
indication of the aircraft angular deviation from a selected course.

 C. MARKER System The marker system is a radio navigation aid. It is normally used together with the Instrument Landing System (ILS) portion of the Multi-Mode Receiver (MMR) during an ILS approach. The system determines the distance between the aircraft and the runway threshold. The marker system also marks particular airway and holding points. The system provides visual and aural indications of the passage of the aircraft over the marker transmitters located on the ground.
 **ON A/C ALL
 2. Component Location
__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)
R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 301-399,
 (Ref. Fig. 001B)
 1EFF : ALL 1 34-55-00Page 2 1 1 Aug 01/05 1 1 1CES 1

 VOR/Marker - Component Location
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 34-55-00Page 3 1 1 May 01/05 1 1 1CES 1

 VOR/Marker - Component Location
 Figure 001A

R 1EFF : 151-199, 401-499, 1 34-55-00Page 4 1 1 Aug 01/05 1 1 1CES 1

R  VOR/Marker - Component Location 
R  Figure 001B 
R 1EFF :  301-399,  1  34-55-00 Page 5 
1  1  May 01/04
 1  1
 1CES  1

 **ON A/C ALL

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------1RS ANTENNA-MARKER 133 34-55-18 3RS1 RECEIVER-VOR/MKR, 1 81VU 127 824 34-55-31 3RS2 RECEIVER-VOR/MKR, 2 82VU 128 824 34-55-31 4RS ANTENNA-VOR 1/2 324 324AT 34-55-11
 3. System Description
__________________

R **ON A/C 001-049, 051-099, 101-105, 151-199,
 A. Principle
 (1)
 VOR system The principle of the VOR navigation is a comparison between a reference phase signal and a variable phase signal. The ground station generates these two signals. The phase difference between the reference and the variable phase is a function of the position of the aircraft with respect to the ground station. Furthermore, the ground station provides a Morse identification.

 (2)
 Marker system There are three marker transmitters positioned on the ground at known distances from the runway threshold :

 -
the outer marker at approx. 4 N miles

 -
the middle marker at 0.6 N miles

 -
the inner marker at the runway threshold.
 The markers transmit a modulated 75 MHz signal to provide a marker
 position.
 When the aircraft passes through the beam of a marker, the modulating
 frequency is detected. Then, the system provides aural and visual
 indications to the flight crew.

 B. System Architecture
 (Ref. Fig. 002)

 (1) VOR system The VOR system comprises two independent systems. Each system consists of : - one VOR/MKR receiver 1(2) 3RS1 (3RS2) - one VOR 1/2 antenna 4RS
 1EFF : ALL 1 34-55-00Page 6 1 1 May 01/05 1 1 1CES 1

 VOR/Marker - Block Diagram
 Figure 002

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-55-00Page 7 1 1 May 01/05 1 1 1CES 1

 - one VOR/DME Radio Magnetic Indicator (VOR/DME RMI) 11FN.
 The components given after control the VOR system:
 (Ref. Fig. 003)

 -
the CAPT (F/O) Audio Control Panel (ACP) 2RN1 (2RN2) and the Audio Management Unit (AMU) 1RN for audio control

 -
the Multipurpose Control and Display Unit 1(2) (MCDU) 3CA1 (3CA2), the Radio Management Panel 1(2) (RMP) 1RG1 (1RG2) and the Flight Management and Guidance Computer 1(2) (FMGC) 1CA1 (1CA2) for frequency/course selection

 -
the MCDU 1(2) and the Centralized Fault-Display Interface-Unit (CFDIU) 1TW for test purposes.

 (2) Marker system The marker system consists of one system only. The receiver is part of the VOR/MKR receiver 1. The system comprises : - one VOR/MKR receiver 1 3RS1 - one marker antenna 1RS. All the data are shown on the CAPT and F/O Primary Flight Displays (PFD).
 C. Utilization Technical Data
 (1) Data display
 (Ref. Fig. 004)

 (a) VOR system
 1 On the Navigation Display (ND)
_ In ROSE and ARC modes. If you set the ADF/VOR/OFF switch on the EFIS control section of the Flight Control Unit (FCU) to VOR, this causes : display of the characteristics of the VOR 1 and/or VOR 2 stations in the L and/or R lower corner of the ND (item 7) :
　
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