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4.3.2. Aircraft  Integrated Data System (A320  Family AIDS) / AircraftCondition Monitoring System (A330/A340 ACMS)
With the integration of modern state-of-the-art technology like the fly-by-wire and the Full Authorized Digital Engine Control (FADEC), the complexity of the aircraft systems led to the development of the Aircraft Integrated Data System. While the FDRS is intended to assist operators in case of incidents/accidents, the main objectives of the AIDS/ACMS are more of a preventive nature
Long term trend monitoring of the aircraft performance really takes place in the frame of maintenance actions and is complementary to all other monitoring actions on the engines or the APU.
4.3.2.1. The AIDS/ACMS functions
AIDS/ACMS is used to monitor the aircraft systems mainly the engines, the APU and the aircraft performance in order to perform preventive action. As a consequence, it will enable operational recommendations to be formulated.
The AIDS/ACMS main functions are described in the picture below.

Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
HOW TO RECORD IN-FLIGHT PARAMETERS

4.3.2.2. How AIDS/ACMS is implemented
The AIDS/ACMS is mainly interfaced with the Data Management Unit (DMU) or Flight Data Interface and Management Unit (FDIMU). Depending on the aircraft configuration, DMU or FDIMU may be fitted on the aircraft.
Basically, the FDIMU is a hardware combining the DMU and FDIU. Only the data management part of the FDIMU will be considered in the following.
The DMU/FDIMU is a high-performance avionics computer specialized for the acquisition of ARINC 429 Digital Information Transfer System (DITS) data and associated processing. All tasks are performed in real time. The DMU/FDIMU is the central part of the AIDS/ACMS and may be reconfigured via the Ground Support Equipment tools of the operator. The DMU/FDIMU interfaces with other aircraft systems such as the FAC or the ADIRU. Approximatively 13000 parameters are fed into the DMU/FDIMU.
CFDIU (BITE)

Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

HOW TO RECORD IN-FLIGHT PARAMETERS

4.3.3. Generic functions of the DMU/FDIMU
Based on these parameters, the DMU/FDIMU performs several tasks:
-It processes incoming data to determine stable frame conditions, and to

monitor limit exceedances, -It generates reports according to specific programmed trigger conditions. -Associated with a ground tool, the DMU/FDIMU is very flexible as it can be re-
programmed by the operator.
4.3.3.1. The Airbus standard reports One of the generic functions of the DMU/FDIMU is the generation of aircraft & engine reports as a result of specific events defined by triggering conditions. The Airbus Standard Reports are a set of pre-programmed AIDS/ACMS reports, which are operative at delivery of the DMU/FDIMU.
These reports have been defined and validated by Airbus. They depend on the aircraft type (A320 family or A330 or A340) and on the engine type.
　
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