-Memorizes any failures which occurred during the 63 previous flight segments or up to memory capacity.
 -Monitors the data exchanges between the system components.
 -Centralizes the triggered tests or self-test results.
 -Dialogs with the CFDIU by means of menus.
 -An additional function is the transmission of the pin-program and a message which serve to identify the system.
 B. General Operation
 (1)
 Normal mode This mode cyclically interrogates the AMU cards in order to know their status and the status of the associated ACP. It transmits this information to the CFDIU and if a failure is detected, records this information in the failure memory. It interrogates the cards one after each other every 13 ms. The processing card generates information with respect to the self-test of this card and the data from the associated ACP. This information is sent to the BITE. This information is sent to CFDIU cyclically every 200 ms under label 356.

 (2)
 Menu mode This mode is used only on the ground. It enables dialog between the AMU and an operator via the Multipurpose Control and Display Unit (MCDU). An air-ground discrete gives the ground-flight information. The LGCIU (Landing Gear Control and Interface Unit - ATA 32-31-00 -Circuit GA) delivers the air-ground discrete.

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R **ON A/C 106-149, 221-299, 301-399, 401-499,

 A. Purpose The Audio Management Unit (AMU) is equipped with a Type 1 BITE circuit.
 B. Not Applicable
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
 C. Functional description (Ref. Fig. 038) The operator uses the 2 MCDUs 3CA1 and 3CA2 installed on the center pedestal to manage the BITE sytem (REF ATA 22-82-00). For the various operations to be performed and the displays obtained, Ref.following figures (Ref. Fig. 039, 040, 041, 042, 043)
 D. Not Applicable
 E. Not Applicable

R **ON A/C 106-149, 221-299, 301-399, 401-499,
 C. BITE Description (Ref. Fig. 038A) The two AUDIO boards, the SELCAL board, the BITE board and the ACPs are the elements monitored by the AMU BITE.
 D. Function The main purpose of the AUDIO system BITE is to supply maintenance assistance. The integrated maintenance function has two levels :
 -
a real time maintenance, which is active during the operation of the unit

 -
a ground maintenance, which brings into operation tests that cannot be performed during the flight. The BITE board manages the dialogue with the CFDIU. It dates and stores in an EPROM memory all the faults detected in the system during the previous 63 flight legs. The BITE board transmits to the CFDIU the data and information that follow :

 -functional status of the system (AMU and ACPs)
 -results of the Built-in tests and of the CFDIU-requested tests
 -unit ATA identifier code - part number and serial number of the unit
 -part number of the ACPs
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 MCDU - Location
 Figure 038

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 Audio Integrating System - BITE Description
 Figure 038A

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R  MCDU - Functional Description Figure 039
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 Audio Integrating System (AIS) - LAST LEG REPORT - (Sheet 2/2)

 Figure 040 
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 Audio Integrating System (AIS) - LAST LEG REPORT
 Figure 040A

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 Audio Integrating System (AIS) - PREVIOUS LEGS REPORT - (Sheet 2/2)

 Figure 041 
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 Audio Integrating System (AIS) - PREVIOUS LEGS REPORT
 Figure 041A

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 Audio Integrating System (AIS) - LRU IDENTIFICATION - (Sheet 2/2)

 Figure 042 
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 Audio Integrating System (AIS) - LRU IDENTIFICATION
 Figure 042A

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 Audio Integrating System (AIS) - TEST - (Sheet 2/2)
　
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