SCOPE OF MONITORING AND FAILURE ANALYSIS

SCOPE OF MONITORING AND FAILURE ANALYSIS

Monitoring and Failure analysis system has the scope of doing the following:

• AFS Trouble Shooting: AFS monitors system and memorizes fault into its non-volatile memory which can be retrieved and decoded step by step. This is a great help for the flight line maintenance of avionics systems. Principle of the AFS Fault Isolation and Detection System (FIDS) is:

 Whenever a basic monitoring condition becomes invalid the associated AFS lever trips,

 The FIDS then takes a snapshot of all parameters and starts its analysis to identify the invalid signal

From the invalid signal, and using its own cross-reference table, the FIDS designates and memorizes of its own the system or unit generating this signal.

- In-service experience has shown that the FIDS of the AFS were able to correctly identify nearly all systems when associated levers have tripped (invalid signal generator).

- In some cases and based on experience or the surrounding context, tripping is considered by the crew as normal and therefore not reported in the log book.

- However the FIDS do not ignore it and a message will be memorized by the MTP when no action is in fact required from the maintenance team.