Integrated, Cabin & Information Systems

Integrated modular avionics (IMA), cabin systems and information systems, with configuration control.

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Main ideas

INTEGRATED MODULAR AVIONICS (IMA, ATA 42): instead of many dedicated 'black boxes' (federated LRUs), IMA runs multiple software functions on shared, standardised computing modules in common cabinets, with robust PARTITIONING so one function cannot corrupt another.
IMA cuts weight, wiring and spares and eases upgrades, but shifts the emphasis to software configuration control, data loading and partition integrity.
CABIN SYSTEMS (ATA 44): the cabin management/intercommunication system, passenger address, in-flight entertainment (IFE) and passenger-service functions.
INFORMATION SYSTEMS (ATA 46): flight-deck and cabin information — electronic flight bags (EFB), network servers and data links — kept SEGREGATED from the certified flight-critical systems by design.
For the B2 technician, software/part-number configuration control and data-loading procedures are as important as the hardware.
⚠ Exam trap: IMA replaces many dedicated LRUs with shared, PARTITIONED computing modules in common cabinets (not one box per function); information systems (EFB etc.) are kept SEGREGATED from flight-critical systems.

Solved examples

What is the main safety principle that lets many different functions share the same IMA computing module?
Robust partitioning. IMA uses strict time and space (memory) partitioning so each hosted application gets guaranteed processor time and protected memory, and cannot access or corrupt another application's data or starve it of resources. This isolation means a fault or overrun in one function stays contained and cannot propagate to the others sharing the module — which is what makes hosting mixed-criticality functions on shared hardware acceptable.

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