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  2. Pressure altimeter - Wikipedia

    en.wikipedia.org/wiki/Pressure_altimeter

    The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. A pressure altimeter is the altimeter found in most aircraft, and skydivers use wrist-mounted versions for similar ...

  3. Parachuting - Wikipedia

    en.wikipedia.org/wiki/Parachuting

    For safety reasons, this requires more equipment than a usual daytime jump and in most jurisdictions, it requires both an advanced skydiving license (at least a B-License in the U.S.) and a meeting with the local safety official covering who will be doing what on the load. A lit altimeter (preferably accompanied with an audible altimeter) is a ...

  4. Radar warning receiver - Wikipedia

    en.wikipedia.org/wiki/Radar_warning_receiver

    The RWR usually has a visual display somewhere prominent in the cockpit (in some modern aircraft, in multiple locations in the cockpit) and also generates audible tones which feed into the pilot's (and perhaps RIO/co-pilot/GIB's in a multi-seat aircraft) headset. The visual display often takes the form of a circle, with symbols displaying the ...

  5. Altimeter - Wikipedia

    en.wikipedia.org/wiki/Altimeter

    An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. [1] The measurement of altitude is called altimetry , which is related to the term bathymetry , the measurement of depth under water.

  6. Variometer - Wikipedia

    en.wikipedia.org/wiki/Variometer

    This audio signal allows the pilot to concentrate on the external view instead of having to watch the instruments, thus improving safety and also giving the pilot more opportunity to search for promising looking clouds and other signs of lift. A variometer that produces this type of audible tone is known as an "audio variometer".

  7. Turkish Airlines Flight 1951 - Wikipedia

    en.wikipedia.org/wiki/Turkish_Airlines_Flight_1951

    The voice recording showed that the crew was given an audible warning signal (landing gear warning horn) that indicated that the aircraft's landing gear should be down, as the aircraft was, according to the captain's radio altimeter, flying too low. This happened several times during the approach to Schiphol.

  8. Paul Kollsman - Wikipedia

    en.wikipedia.org/wiki/Paul_Kollsman

    A short time later the Kollsman company received an order from the U.S. Navy for 300 altimeters, their first commercial success. [1] [2] [5] Subsequent models were modified to allow the pilot to easily set a local altimeter setting, shown in the "Kollsman window". [2] [6] [17] By the mid-1930s Kollsman altimeters dominated the aircraft market. [18]

  9. Absolute threshold of hearing - Wikipedia

    en.wikipedia.org/wiki/Absolute_threshold_of_hearing

    Two methods can be used to measure the minimal audible stimulus [2] and therefore the absolute threshold of hearing. Minimal audible field involves the subject sitting in a sound field and stimulus being presented via a loudspeaker. [2] [14] The sound level is then measured at the position of the subject's head with the subject not in the sound ...