11.18 Onboard Maintenance Systems Q's Flashcards
On-board maintenance systems have been developed to?
Assist maintenance personnel in fault finding complex avionics syste,s
The OMS consists of what 4 systems?
- Central maintenance system (CMS)
- Data loading system
- Electronic Library system
- Report printing System
Identify the system components.
What are the 2 modes the CMS operates in?
- Normal - Records faults generated by FWC and failed BITES
- Menu - Allows the operator to obtain troubleshooting data from the systems and initiate tests via MCDU. (AVAILABLE ON GROUND ONLY)
Which CMS mode allows the access of troubleshooting and where can you access it?
Menu - Only on the ground.
Which type of memory stores CMC failure information and messages received from the system BITE?
Non-Volatile Memory
Which MCDU menu allows access to the CMC functions?
CMS
The CMC memorizes data concerning all the aircraft systems in?
Non-Volatile Memory
Identify the system Types and their inputs and outputs.
Type 1: ARINC 429 IN/OUT
Type 2: Discreet In / ARINC out
Type 3: Discreet In and Out
The CMC CPU organises?
Received data into reports.
How many CMC’s are available on an aircraft?
2 for redundancy, 1 is the master CMC
What means of communication is used by the ACARS system?
VHF/HF/Satcom/Wireless Lan
How many system failure classes are their and identify their urgency.
Class 1 - Operational consequences, warning displayed on ECAM
Class 2 - No operational consequences, displayed on ECAM status
Class 3 - No safety or operational concerns, accessed via MCDU on GROUND
What name is given to the ARINC 429 link between CMC1 and CMC2 which allows them to exchange data.
Cross Talk (X-Talk)
Which type of strain gauges (structural monitoring) generates electricity in response to applied stresses?
Piezo Sensors
What would happen to resistance when the illustrated strain gauges gets stretched?
Resistance increases
