ED Decision 2012/019/R
TWO INDEPENDENT ALTITUDE MEASUREMENT SYSTEMS
Each system should be composed of the following components:
(a) cross-coupled static source/system, with ice protection if located in areas subject to ice accretion;
(b) equipment for measuring static pressure sensed by the static source, converting it to pressure altitude and displaying the pressure altitude to the flight crew:
(c) equipment for providing a digitally encoded signal corresponding to the displayed pressure altitude, for automatic altitude reporting purposes;
(d) static source error correction (SSEC), if needed to meet the performance criteria for RVSM flight envelopes; and
(e) signals referenced to a flight crew selected altitude for automatic control and alerting. These signals will need to be derived from an altitude measurement system meeting the performance criteria for RVSM flight envelopes.
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