The modern "Aircraft Instruments and Avionics" PDF curriculum places heavy emphasis on the transition from analog to digital. This is where the avionics definition expands.
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Uses a calibrated leak in the static system to show the rate of climb or descent.
| Item | FAR | Max interval | |------|-----|---------------| | Altimeter system test | 91.411 | 24 months | | Transponder test | 91.413 | 24 months | | ELT battery & test | 91.207 | 1 hour cumulative use or 50% battery life | | GPS database | Advisory | 28 days (IFR) |