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  2. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 3100, 3200, 3300, 3400, 3500, 3600, 3700 US: External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 4000 Australia

  3. Transponder (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Transponder_(aeronautics)

    A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...

  4. SELCAL - Wikipedia

    en.wikipedia.org/wiki/SELCAL

    In international aviation, SELCAL or SelCal is a selective-calling radio system that can alert an aircraft's crew that a ground radio station wishes to communicate with the aircraft. SELCAL uses a ground-based encoder and radio transmitter to broadcast an audio signal that is picked up by a decoder and radio receiver on an aircraft.

  5. Grimes Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Grimes_Manufacturing_Company

    At the same time, it built Grimes Field, which it continued to operate until 1987. [3] It again expanded in 1966, when construction began on a new 42,000 square foot addition. [4] From the 1960s to the 1980s, the company operated a Beech 18 called the Grimes Flying Lab to test its lights. [5] [6]

  6. 721st Air Mobility Operations Group - Wikipedia

    en.wikipedia.org/wiki/721st_Air_Mobility...

    The EDS was organized to give units in Europe a quicker way to receive small equipment items or supplies on a round-the-clock basis, without the expense of the larger cargo aircraft. The group also supported Special Air Transportation of HQ USAFE executives with a fleet of light transport. The 10th MAS was inactivated in 1991. [2]

  7. Distress signal - Wikipedia

    en.wikipedia.org/wiki/Distress_signal

    The civilian aircraft frequency for voice distress alerting is 121.5 MHz. Military aircraft use 243 MHz (which is a harmonic of 121.5 MHz, and therefore civilian beacons transmit on this frequency as well). Aircraft can also signal an emergency by setting one of several special transponder codes, such as 7700.

  8. What 'secret' loudspeaker codes mean at department stores - AOL

    www.aol.com/news/2010-10-13-what-secret...

    If you've been shopping in a big box retail store you've probably heard an announcement on the loudspeaker such as, "code yellow toys, code yellow toys." This "code" is one of many innocuous ...

  9. AN/AAR-47 Missile Approach Warning System - Wikipedia

    en.wikipedia.org/wiki/AN/AAR-47_Missile_Approach...

    AAR-47 Sensors mounted on a USMC V-22 Osprey aircraft. The AAR-47 missile warning system consists of 4 Optical Sensor Converters (OSC), a Computer Processor and a Control Indicator. The system is relatively light at a total weight of approximately 32 pounds. [4] There is one optical sensor converter for each side of the aircraft.