13.10 - Onboard Maintenance Systems Flashcards
Onboard maintenance systems are made up of
Central maintenance system
Data loading & config system
Aircraft condition monitoring system
Electronic tech log
Electronic docs
CMS primary function
Centralise all recorded failures using bite data from LRU’s
Normal mode
Inflight or on ground
Provides continuous monitoring
Detects and idents failures
Centralises failure events & parameters sent by the bites
Generates reports
Interactive mode
Only on the ground
Interactive system tests
System monitoring
Maintenance history
Data acquisition performed by 4 key systems
ECAM
FDR’s
CMS
ACMS
Data consolidation
Normal parameters and information displayed on ECAM
ACMS & FDR consolidates mandatory information
CMS consolidates & generates reports
Data analysis
3 groups
Minor T/S uses ECAM & CMS to produce reports
In-depth T/S used CMS & ACMS reports
Long term maintenance uses ACMS & FDR’s
CMS architecture
Bite info
Log book entries
Onboard data - capt /F/O terminals
OMT
PMAT
Printer
Fault classification
Class 1 - any detected failure causing a FDR
Class 2 - not used
Class 3 - any detected failure generating a cabin effect - not a airworthiness item pax comfort only
Class 4 - any detected failure - no flight deck or cabin effect but time limited for repair
Class 5 - any detected failure no flight deck or cabin effect and no airworthiness restriction but will cause a flight deck or cabin effect if other failures occur
Class 6 - no detected failure - no airworthiness issue & no time limit repair interval
Class 0 - operational effect or detected failure is not known by the monitoring system
Post flight report and system report
PFF can be viewed on the C.D.U and printed or sent via acars
Airman
Transmits OMS data via ACARs to airman to help with onboard monitoring
BITE
Combination of LRUs to make up a system computer sensors etc which are monitored. If a fault occurs the controller can monitor and record the faults. Once the fault is being troubleshooting the engineer can use the bite to look at fault info also the lrus can identify the possible fault. Stored in non volatile memory
Bite tests can be spilt into 4 categories
Power up test - usually on the ground but sometimes in flight if a power failure occurs
Cyclic test (operation) carried out permanently throughout the units service life
System test ground test carried out by maintenance staff
Specific tests e.g auto slat
ACMS main function
To support scheduled maintenance and preventive maintenance by monitoring the efficiency & degradation of the aircraft systems and environment
ACMS monitors
Engines
aircraft systems
Aircraft performance in-depth troubleshooting
To achieve this the ACMS system can
Generate automatic reports
Record data
Display aircraft parameters in real time
ACMS system consists of
Data management unit (including storage)
Flight data interface unit DFDAU
Ground support equipment
Digital ACMS recorder
Interface with ACMS
MCDU - interfaces and can be used to send/access reports
CDAM
I’m newer aircraft like the 350/380
Acquires ACMS data through the CDAM from equipment work AFDX interface
CDAM has 3 functions
Flight data interface for the FDR
ACMS real time processing
Remote server acquisition
ACMS reports
2 report types
Standard report - Airbus defined
Airline reports - airline programmed
100 reports can be generated
30 predefined
15 for each type of engine and 10 system reports
Upto 64 programmable
Airline reports
ACMS manual report trigger
Manual trigger that crews and maintenance can use to record and save parameters they can be retrieved via DAR files and viewed onboard printed or data linked to the ground
Ground support equipment
Is a computer that can read 3.5” floppy discs and PCMIA cards providing functions to
Reconfiguration function & read out function
Data loader
PCMIA interface
Data loading systems
Multipurpose disc drive unit
Portable data loader
Automatic mode can upload and download information
Manual mode used to download information
MDDU compromises of
Unit including a power supply
Disc drive
LCD display window 16 characters
Abnormal operation
Transfer failure
Unit fail
Disc error
Uploading example
NDB
Downloading example
FDR
Hard pin programming
Physical pin programming on rack and lrus used for major systems
Software pin programming
Carried out for non major systems
Electronic library systems
Onboard system combined with data for maintenance and flight so that it can be accessed from the airplane and have a central base of information
Airborne Printer
Print of ACMS data, nav data ACARs info etc
