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 B. Activation of the Test Function The DME 1(2) test function can be activated in ground conditions only by pressing the line key adjacent to the TEST indication on the DME 1(2) maintenance sub-menu or by pressing the pushbutton switch on the face of the interrogator.
 **ON A/C ALL
 C. CFDIU Interface
 (1) BITE description The BITE facilitates maintenance on in-service aircraft. It detects and identifies a failure related to the DME system. The BITE of the DME interrogator is connected to the CFDIU (Ref. 31-32-00). The BITE:
 -transmits permanently DME system status and its identification message to the CFDIU
 -memorizes the failures which occurred during the last 63 flight segments
 -monitors data inputs from the various peripherals (FMGC, RMP and CFDIU)
 -transmits to the CFDIU the result of the tests performed and self-tests
 -can communicate with the CFDIU through the menus. The BITE can operate in two modes:
 -
the normal mode

 -
the menu mode

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 (a)
 Normal mode During the normal mode the BITE monitors cyclically the status of the DME system. It transmits its information to the CFDIU during the concerned flight. In case of fault detection the BITE stores the information in the fault memories. These items of information are transmitted to the CFDIU every 167 ms by an ARINC 429 message with label 356.

 (b)
 Menu mode The menu mode can only be activated on the ground. This mode enables communication between the CFDIU and the DME interrogator BITE by means of the MCDU. The DME menu mode is composed of:

 -LAST LEG REPORT
 -PREVIOUS LEGS REPORT
 -LRU IDENTIFICATION
 -GND SCANNING
 -TROUBLE SHOOTING DATA
 -CLASS 3 FAULTS
 -GROUND REPORT
 -TEST.
 (2) Interactive function The interactive mode can be activated on the ground only, using the line key adjacent to the DME 1 (or 2) indication on the SYSTEM REPORT/TEST page of any MCDU (Ref. 22-82-00). This mode enables communication between the CFDIU and the BITE of the DME interrogator by means of the MCDU. (Ref. Fig. 009) The interactive mode is composed of:
 -LAST LEG REPORT
 **ON A/C 001-049, 101-105, 151-199,
 (Ref. Fig. 010)
R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 010A)
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 DME - Maintenance Test Procedure - DME Menu (sheet 1/5)
 Figure 010

R 1EFF : 001-049, 101-105, 151-199, 1 34-51-00Page 36 1 1 May 01/05 1 1 1CES 1

 DME - Maintenance Test Procedure - DME Menu (sheet 1/5)
 Figure 010A

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 34-51-00Page 37 1401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 This menu contains the fault messages (class 1 and 2, internal and external) detected during the last flight.
 -PREVIOUS LEGS REPORT
 **ON A/C 001-049, 101-105, 151-199,
 (Ref. Fig. 010)

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 010A)
 **ON A/C ALL
 This report contains the fault messages related to the external or internal failures (class 1 and 2) recorded during the previous 63 flight legs.
 -LRU IDENTIFICATION
 **ON A/C 001-049, 101-105, 151-199,
 (Ref. Fig. 010)

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 010A)
 **ON A/C ALL
 Allows to display the P/N and the S/N of the equipment.
 -GND SCANNING (Ref. Fig. 011) Based on the monitoring and fault analysis during flight, provides information of the failures detected while using this function.
 -TROUBLE SHOOTING DATA (Ref. Fig. 011) Provides correlation parameters and snapshot data concerning the failure displayed in the LAST LEG REPORT and PREVIOUS LEGS REPORT.
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 DME - Maintenance Test Procedure - DME Menu (sheet 2/5) Figure 011
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 -CLASS 3 FAULTS (Ref. Fig. 012) Allows to display the class 3 faults recorded during the last flight leg.
 -GROUND REPORT (Ref. Fig. 012) Allows to present the class 1, 2 or 3 internal failures detected on ground.
 -TEST.
 **ON A/C 001-049, 101-105, 151-199,
 (Ref. Fig. 013)

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 013A)
 **ON A/C ALL
 (Ref. Fig. 014)
 allows a check of the correct operation of the DME interrogator.

 (3) List of components All the components are listed in the Para. 2. Component Location.
　
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