ADIRS mental model
Air-data sensors/modules + inertial sensors/processing → ADIRUs → shared navigation/air-data outputs for many consumers.
Use this as a refresher
Place the idea inside the full system chain: source/input → control → physical response → sensing/indication → consumer/result. If the quick note seems to conflict with the aircraft in front of you, stop and confirm configuration, effectivity and current approved data.
Maintenance boundary: this is a study reminder, not a task instruction.