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  2. Emergency - Wikipedia

    en.wikipedia.org/wiki/Emergency

    Emergency slides are deployed after the crash landing of British Airways Flight 38. An emergency is an urgent, unexpected, and usually dangerous situation that poses an immediate risk to health, life, property, or environment and requires immediate action. [1]

  3. Mayday - Wikipedia

    en.wikipedia.org/wiki/Mayday

    Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications.. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organizations such as firefighters, police forces, and transportation organizations also use the term.

  4. Crisis - Wikipedia

    en.wikipedia.org/wiki/Crisis

    1 Etymology. 2 Definition. Toggle Definition subsection. ... with little or no warning. More loosely, a crisis is a testing time for an emergency. Etymology

  5. Pan-pan - Wikipedia

    en.wikipedia.org/wiki/Pan-pan

    Pan-pan calls may be made on the aircraft emergency frequency, but they are more often made on the frequency already in use, or another appropriate frequency. ICAO Annex 10, Volume V, § 4.1.3.1.1 states "the emergency channel (121.5 MHz) shall be used only for genuine emergency purposes". However, ICAO member states can deviate from this rule.

  6. Abbrev. [1]Meaning [1] Latin (or Neo-Latin) origin [1]; a.c. before meals: ante cibum a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte ...

  7. Scram - Wikipedia

    en.wikipedia.org/wiki/Scram

    SCRAM button at the Experimental Breeder Reactor I in Idaho. Sometimes the switch will have a flip cover to prevent inadvertent operation. A scram or SCRAM is an emergency shutdown of a nuclear reactor effected by immediately terminating the fission reaction.

  8. Online Etymology Dictionary - Wikipedia

    en.wikipedia.org/wiki/Online_Etymology_Dictionary

    The Online Etymology Dictionary or Etymonline, sometimes abbreviated as OED (not to be confused with the Oxford English Dictionary, which the site often cites), is a free online dictionary that describes the origins of English words, written and compiled by Douglas R. Harper.

  9. Disaster - Wikipedia

    en.wikipedia.org/wiki/Disaster

    This is an accepted version of this page This is the latest accepted revision, reviewed on 7 November 2024. Event resulting in major damage, destruction or death For other uses, see Disaster (disambiguation). Ruins from the 1906 San Francisco earthquake, one of the worst disasters in the history of the United States A disaster is an event that causes serious harm to people, buildings ...