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 switch on the ACP. 
R  **ON A/C 051-099, 
R  A. Principle 
R  - The principle of the DME navigation is based on the measurement of the 
R  transmission time. Paired interrogation pulses go from an onboard 
R  interrogator to a selected ground station. After 50 microseconds, the 
R  station transmits the reply pulses to the aircraft. 
R  - The measurement of time between transmitting the interrogation pulses 
R  and receiving the reply pulses is a function of the slant range 
R  distance of the aircraft to the ground station. 
R  The measurement value is converted into nautical miles and shown to the 
R  crew. 
R  - The interrogation frequencies vary from 1041 to 1150 MHz. The reply 
R  frequencies vary from 962 to 1213 MHz. 
R  - Furthermore, the ground station provides a Morse identification. 
R  B. System Architecture 
R  (Ref. Fig. 002) 
R  The DME comprises two independent systems. Each system consists of : 
R  - one DME interrogator 2SD1 (2SD2) 
R  - one DME antenna 3SD1 (3SD2) 
R  - one dual VOR/DME Radio Magnetic Indicator (VOR/DME RMI) 11FN. 
R  The components given after can control the DME system: 
R  (Ref. Fig. 003) 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-51-00Page 12 1 1 May 01/05 1 1 1CES 1

R  - the CAPT (F/O) Audio Control Panel (ACP) 2RN1 (2RN2) and the Audio 
R  Management Unit (AMU) 1RN for audio controls 
R  - the Multipurpose Control and Display Unit 1(2) (MCDU) 3CA1 (3CA2), the 
R  Radio Management Panel 1(2) (RMP) 1RG1 (1RG2), and the Flight 
R  Management and Guidance Computer 1(2) (FMGC) 1CA1 (1CA2) for 
R  frequency/course selection 
R  - The MCDU and the Centralized Fault-Display Interface-Unit (CFDIU) 1TW 
R  for test causes. 
R  The DME data are shown on : 
R  - the CAPT and F/O Primary Flight Displays (PFD) 
R  - the CAPT and F/O Navigation Displays (ND) 
R  - the VOR/DME RMI 
R  - the MCDU(s) (maintenance data). 
R  C. Utilization Technical Data 
R  (1) Data display 
R  (Ref. Fig. 004) 
R  (a) On the PFDs 
R  With ILS/DME collocated stations, the ILS/DME distance is shown 
R  in magenta in the L lower corner of the PFD (Item 1). These data 
R  come into view when you push the ILS pushbutton switch located on 
R  the EFIS control section of the Flight Control Unit (FCU). 
R  (b) On the NDs 
R  The VOR/DME distance is shown in green in the L lower corner of 
R  the ND for DME system 1 (Item 2), and in the R lower corner of 
R  the ND for DME system 2 (Item 3) when : 
R  - you set the mode selector switch on the EFIS control section of 
R  the FCU to ROSE (ILS, VOR, NAV) or ARC 
R  - you set the ADF/VOR/OFF switch to VOR. 
R  In addition, when you push the VOR-D pushbutton switch on the 
R  EFIS control section of the FCU, this causes : 
R  Display of the VOR/DME and DME ground stations which are not 
R  already included in the flight plan, with the mode selector 
R  switch in ROSE NAV and ARC positions : 
R  - a circle for the DME station 
R  - circle plus cross symbol for the VOR/DME station. 
R  (c) On the VOR/DME RMI 
R  Two windows are available for indication of both distances from 
R  the DME 1 and DME 2 (Item 4) when the VOR/DME stations are 
R  collocated. 
R  When the DME or RMI monitoring circuits detect a fault, the 
R  corresponding display window (Item 5) is blanked. 

R 1EFF : 051-099, 1 34-51-00Page 13 1 1 May 01/05 1 1 1CES 1 In case of No Computed Data (NCD) (out-of-range station) the windows show white horizontal dashed lines (Item 6). In addition, the LEDs on the face of the DME interrogator indicate the status of the DME system.

 (2) Audio control The DME interrogator applies its audio output to the audio integrating system. This system controls and directs the output to the headsets and/or the loud speakers. The pilot can control the DME audio signals by pressing the VOR pushbutton switch on the ACP and adjusting the related potentiometer to the correct audio level. In case of collocated ILS/DME ground stations and when the ILS pushbutton switch is pressed on the EFIS control section of the FCU, the pilot can control the DME audio signal through the ILS pushbutton switch on the ACP.
　
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