Digital AIDS Recorder (DAR) is designed to provide easy access to a removable medium, such as an optical disk, cassette (50 hour magnetic tape), or PCMCIA card, on which parameters are recorded.
Getting to grips with FOM

Aircraft Integrated Data System
Note: Compare to the basic DMU, the extended DMU is equipped with a slave microprocessor board for customer programmable functions and interface to upload, download and record data on PCMCIA card.
Flight Data Interface and Management Unit
In certain airplanes the FDIU/AIDS architecture is regrouped in a one Flight Data Interface and Management Unit (FDIMU), with integrated PCMCIA interface. FDIMU records mandatory parameters complying with the applicable Airworthiness Requirements as well as engines, APU and other systems' parameters for performance and operational analysis.
The data management function enables:
.  
Recording the AIDS data on an optional external Digital AIDS Recorder (DAR)

.  
On request, recording / downloading of pre-programmed compressed data files (SAR data files) and reports

.  
Uploading of operational software and customer database.

The flight data interface function enables:
.  Recording of mandatory parameters required by the Airworthiness Authorities on a Solid State Flight Data Recorder (SSFDR) or on an optional external Quick Access Recorder (QAR).

FOM OVERVIEW

On ground
Ground-based elements of the FOM system are essentially dedicated to data processing,
analysis and storage.

For the FDM part, a PC based system:
1.  
Collects raw data recorded by the on-board recorder;

2.  
Processes raw data and transcribes them into engineering values;

3.  
Analyzes all of the engineering values, using specific software models and algorithms, to check that the aircraft is being flown within its safety envelope by marking unusual deviations and grade the severity of them;

4.  
Automatically prioritizes the diagnostic results in accordance with user-specific criteria to spot any possible deviations that could adversely affect flight safety;

5.  
Creates periodic customized reports.

For Crew Observation and Pilot Self Reporting:
1.  
Observation data is inserted into dedicated software by the Observer, or Trained persons in the case of Pilot Self Reports.

2.  
Creates periodic customized reports

For both FDM and Crew Observation or Pilot Self Reporting the trends of events are monitored to highlight "areas of concern". If a critical deviation is identified the Gatekeeper is the first means of identifying (by questions, or interview) any reasons that may exist for the deviation. According to the response the matter finishes there, or is passed on to the Flight Safety Manager for further action.
　
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