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MECHANICS / ELECTRICS & AVIONICS COURSE 31 INDICATING/RECORDING SYSTEMS
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31 - INDICATING/REPORTING SYSTEMS
31-30-00 CFDS: ON BOARD MAINTENANCE
FACILITIES
CONTENTS:
Acquisition
Consolidation
Retrieval
Analysis
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CFDS: ON BOARD MAINTENANCE FACILITIES
ACQUISITION
The acquisition of aircraft system data is performed
by 4 major electronic systems :
- the Electronic Centralized Aircraft Monitoring
(ECAM) system which monitors the operational
data in order to display warnings and system
information,
- the Digital Flight Data Recording System
(DFDRS) which is mandatory and records aircraft
operational parameters for incident
investigation purposes,
- the Aircraft Integrated Data System (AIDS)
which records aircraft parameters for engine
condition, APU condition and aircraft
performance monitoring.
- the Centralized Fault Display System (CFDS)
which monitors the BITE data in order to record
the system failures.
CONSOLIDATION
In normal operation, the ECAM permanently displays
normal aircraft parameters and the DFDRS permanently
records aircraft system parameters.
When an anomally is detected by an aircraft system,
the ECAM displays the abnormal parameter or function
and its associated warning and the CFDS records the
failure information detected by the system BITE.
RETRIEVAL
All the information can be retrieved through :
- the cockpit Multi-purpose Control Display Unit,
- the ECAM displays,
- the cockpit printer,
- the recorders.
ANALYSIS
Maintenance operations can be divided into 3 groups :
- minor trouble shooting which is performed with
the help of the ECAM and the CFDS through the
MCDUs and printed reports.
- in-depth trouble shooting which is performed
with the help of the CFDS through the MCDUs
and printed reports.
- long term maintenance which is performed
with the help of the AIDS through printed
reports and recorded data.
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31-32-00 CFDS: BITE PHILOSOPHY
CONTENTS:
General
BITE
Test
New Concept
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CFDS: BITE PHILOSOPHY
GENERAL
A system is composed of LRUs which can be: computers,
sensors, actuators, probes, etc.
With the new technology, most of these Line Replaceable
Units (LRUs) are controlled by digital computers.
For safety reasons, these LRUs are permanently
monitored, they can be tested and troubleshooting can
be performed.
In each system, a part of a computer is dedicated to
these functions: it is called Built-In Test Equipement.
Sometimes, in multi-computer systems, one computer is
used to concentrate the BITE (Built-In Test Equipment)
data of the system.
BITE
During normal operation, the system is permanently
monitored: internal monitoring, inputs/outputs
monitoring, link monitoring between LRUs within the
system.
FAULT DETECTION
- If a failure occurs, it can be permanent
(consolidated) or intermittent.
ISOLATION
- After failure detection, the BITE is able to identify
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