Sticking altimeter
"ACD Air Avionics Altimeter and more."
There is also the LXNav Air Data Indicator - combined altimeter and ASI.
With either of these devices, is there any battery backup? Is there a legal requirement for a battery independent system? Do you have to have any instrumentation separate from the flight computer since flight computers can display all of altitude/height, airspeed and vario, and can control radio and transponder?
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