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Avionics apparatus for providing to a pilot readings of temperature, pressure altitude, and density altitude. Sensors provide electrical signals responsive to ambient temperature and pressure, and a functional module operates on signals derived from said sensors to provide signals indicative of the

Avionics apparatus for providing to a pilot readings of temperature, pressure altitude, and density altitude. Sensors provide electrical signals responsive to ambient temperature and pressure, and a functional module operates on signals derived from said sensors to provide signals indicative of the pressure altitude and density altitude. A multiplexer and display respond to a mode selection switch to provide visual readouts of temperature in degrees Fahrenheit and in degrees Celsius, and altitude.

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Avionics apparatus for displaying readouts of temperature and altitude comprising pressure transducer means responsive to ambient pressure and generating a pressure electrical signal, temperature transducer means responsive to ambient temperature and generating a temperature electrical signal, first

Avionics apparatus for displaying readouts of temperature and altitude comprising pressure transducer means responsive to ambient pressure and generating a pressure electrical signal, temperature transducer means responsive to ambient temperature and generating a temperature electrical signal, first preamplifier and bias circuitry for receiving said pressure electrical signal and generating an adjusted pressure electrical signal, second preamplifier and bias circuitry for receiving said temperature electrical signal and generating an adjusted temperature electrical signal, conversion means for receiving said adjusted temperature electrical signal and generating a converted temperature electrical signal, mode selection means for selecting a mode of operation of said avionics apparatus, a function module means, means responsive to said mode selection means for applying said adjusted temperature electrical signal and said adjusted pressure electrical signal to said function module means, said function module means being responsive to said mode selection means and generating a first electrical signal as a function of said adjusted pressure signal and generating a second electrical signal as a function of said adjusted temperature electrical signal and of said adjusted pressure electrical signal, multiplexer means, means for applying said converted temperature electrical signal, said first electrical signal, and said second electrical signal to said multiplexer means, display means, and means connecting said multiplexer to said display means whereby said display means selectively displays temperature and altitude in response to said mode selection means.