C. VDR voice/data mode selection The system has direct control of VDR3 switching between voice and data mode. A switching to voice/data request can be issued from:
 -any RMPs
 -the Multipurpose Control and Display Unit (MCDU) through the Air Traffic and Information Management System (ATIMS) (Ref. 46-21).
 **ON A/C ALL
 8. Test
____

R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399, 401-499,
 A. Built-in-Test Equipment (BITE) The BITE facilitates maintenance on in-service aircraft. The BITE detects and determines a failure related to the VHF system. The BITE of the VHF transceiver is connected to the Centralized Fault Display Interface Unit (CFDIU). Refer to ATA 31-32. The BITE:
 -Transmits permanently VHF system status and an identification message to the CFDIU
 -Memorizes the failures occured during the last 63 flight legs
 -Monitors data input from the various peripherals (RMP and CFDIU)
 -Transmits to the CFDIU the result of the tests performed and self-tests
 -Can communicate with the CFDIU by the menus.
 B. General Operation
 The BITE has two operation modes:

 -
The normal mode

 -
The menu mode.

 (1) Normal mode During the normal mode, the BITE monitors cyclically the momentaneous status of the VHF system. It transmits these information signals to the CFDIU during the flight concerned. In case of fault detection, the BITE stores the information signals in the fault memories. These information signals are transmitted to the CFDIU every 100 ms by an ARINC 429 message with label 356.
 1EFF : ALL 1 23-12-00Page 40 1 1 Aug 01/05 1 1 1CES 1

 (2) Menu mode The menu mode can only be activated on the ground. This mode enables communication between the CFDIU and the VHF transceiver BITE. This is by means of the MCDU of the maintenance system. The VHF transceiver menu mode is composed of:
 -LAST LEG REPORT
 -PREVIOUS LEGS REPORT
 -LRU IDENTIFICATION
 -GND SCANNING TROUBLE
 -TROUBLE SHOOT DATA
 -CLASS 3 FAULTS
 -TEST
 -GROUND REPORT
 **ON A/C 151-199,
 (Ref. Fig. 012)
 A. Built-in-Test Equipment (BITE) The BITE facilitates maintenance on in-service aircraft. The BITE detects and determines a failure related to the VHF system. The BITE of the VHF transceiver is connected to the Centralized Fault Display Interface Unit (CFDIU). Refer to ATA 31-32. The BITE:
 -Transmits permanently VHF system status and an identification message to the CFDIU
 -Memorizes the failures occured during the last 63 flight legs
 -Monitors data input from the various peripherals (RMP and CFDIU)
 -Transmits to the CFDIU the result of the tests performed and self-tests
 -Can communicate with the CFDIU by the menus.
 B. General Operation
 The BITE has two operation modes:

 -
The normal mode

 -
The menu mode.

 (1) Normal mode During the normal mode, the BITE monitors cyclically the momentaneous status of the VHF system. It transmits these information signals to the CFDIU during the flight concerned. In case of fault detection, the BITE stores the information signals in the fault memories. These information signals are transmitted to the CFDIU every 250 ms (max) by an ARINC 429 message with label 356.
 1EFF : ALL 1 23-12-00Page 41 1 1 May 01/05R 1 1 1CES 1

 VHF System - BITE Monitoring
 Figure 012 
R 1EFF :  151-199,  1  23-12-00 Page 42 
1  1  May 01/05
 1  1
 1CES  1

 (2) Menu mode The menu mode can only be activated on the ground. This mode enables communication between the CFDIU and the VHF transceiver BITE. This is by means of the MCDU of the maintenance system. The VHF transceiver menu mode is composed of:
 -LAST LEG REPORT
 -PREVIOUS LEGS REPORT
 -LRU IDENTIFICATION
 -GND SCANNING TROUBLE
 -TROUBLE SHOOT DATA
 -CLASS 3 FAULTS
 -TEST
 -GROUND REPORT
 **ON A/C ALL
 C. Functional Description
 (1)
 LAST LEG REPORT (Ref. Fig. 013) This report contains the Class 1 and 2 internal and external faults recorded during the last flight.

 (2)
 PREVIOUS LEGS REPORT (Ref. Fig. 014) The messages are identical to those given in the paragraph above but concern the faults occured during the last 63 flights.

 (3)
 LRU IDENTIFICATION (Ref. Fig. 015) This report displays the Part Number (P/N) and the Serial Number (S/N).
　
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