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  2. Transponder (aeronautics) - Wikipedia

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

    Collision avoidance systems have been developed to use transponder transmissions as a means of detecting aircraft at risk of colliding with each other. [ 6 ] [ 7 ] Air traffic control (ATC) units use the term "squawk" when they are assigning an aircraft a transponder code, e.g., "Squawk 7421".

  3. Runway Awareness and Advisory System - Wikipedia

    en.wikipedia.org/wiki/Runway_Awareness_and...

    The Runway Awareness and Advisory System (RAAS) is an electronic detection system that notifies aircraft flight crews on the ground of their position relative to their allocated runway. It is a type of Runway Situation Awareness Tool (RSAT).

  4. 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.

  5. Voice warning system - Wikipedia

    en.wikipedia.org/wiki/Voice_warning_system

    A voice warning system is a system designed to alert the crew of an aircraft to imminent safety hazards. It is often known as a Bitchin' Betty, a slang term used by some pilots and aircrew and submariners (mainly North American). The enunciating voice, in at least some aircraft systems, may be either male or female.

  6. 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.

  7. Urgent safety alert on Boeing 737s, MAX issued; NTSB says ...

    www.aol.com/urgent-safety-alert-boeing-737s...

    NTSB investigators reported discovering critical controls on some Boeing 737s — including its MAX airplanes — could jam after discovering a part that could fail.

  8. Aircraft emergency frequency - Wikipedia

    en.wikipedia.org/wiki/Aircraft_emergency_frequency

    The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...

  9. Flight tracking - Wikipedia

    en.wikipedia.org/wiki/Flight_tracking

    This application of flight tracking is currently in its infancy, but is set to grow significantly as systems get more connected. Despite the progress, many abrupt events like sudden weather changes are not captured by existing flight trackers because they take their information not from the airplane itself but from dispatcher centers which ...

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