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 done with the use of a breakout box and test cables or
 equivalent.
 4_ After a fault isolation procedure action has been completed a
 check must be done to make sure that the reported fault has
 been corrected.
 5_ When an AMM LRU replacement procedure is referenced in the
 TSM, the AMM procedure usually specifies a test. This AMM test
 is to make sure that the replacement unit is installed
 correctly. It does not always confirm the correction of the
 fault symptom. In such a case the TSM refers to the
 appropriate operational or system test procedure.
 6_ Warnings about static sensitive devices may have to be used to
 prevent damage to sensitive devices.
 7_ On the ground, a tripped circuit breaker must not be engaged
 without trouble shooting of the associated system.

 H. Trouble Shooting Summary
 (Ref. Fig. 011)
 The various possibilities for using the TSM are summarized in the flow
 chart in the following figure.

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 4. How to Use the CFDS
___________________

 A. Types of systems
 Systems have been divided into three categories in order to limit the complexity:
 -
type 1

 -
type 2

 -
type 3 depending on the type of interface that they may have with the CFDIU. This system organization in three types essentially remains transparent for the operator as the CFDIU manages any differences. Nonetheless, their definitions make it possible to understand why certain menus are simplified.

 (1) Type 1 systems
 These systems are characterized by an input/output interface with the CFDIU of the ARINC 429 bus/ARINC 429 bus type. Most systems are provided with this type of interface. This type of system enables: - output: permanent transmission to the CFDIU of maintenance messages
 generated during the current flight or during the last flight
 -input: an operator to dialog on the ground with the BITEs and therefore have access to complementary information (test, ground report, etc.).
 (2) Type 2 systems
 These systems are characterized by an input/output interface with the
 CFDIU of the discrete/ARINC 429 bus type.
 This type of system enables:
 - output: permanent transmission to the CFDIU of maintenance messages

 generated during the current flight or during the last flight as well as permanent transmission while on the ground of maintenance messages generated on the ground
 -input: an operator to launch on the ground the system test and to obtain the results via the output bus.
 (3) Type 3 systems
 These systems are characterized by an input/output interface with the
 CFDIU of the discrete/discrete type.
 This type of system enables:
 - output: permanent transmission of the operating status (OK, not OK)

 -input: an operator to launch on the ground the system test and to
 obtain the result (OK, or not OK) via the discrete output. The CFDIU codes the corresponding maintenance message in plain language.
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 CES  B. System BITE

 (Ref. Fig. 012) When a system includes several computers, one of the computers collects the maintenance information and provides the link between the system and the CFDIU. It then realises the BITE function and therefore reports on behalf of all system computers. This architecture provides for a better targeted diagnosis by correlating data between system computers as well as reducing bus links with the CFDIU. For the operator, the resulting consequences are minor:
 -it is the maintenance message itself which identifies, where necessary, the message source in the system example: source = ECAM1; message = SDAC1 : NO DATA FROM BMC1. The SDAC which is part of the Flight Warning System has generated the message.
　
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