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
