What is the difference between Class 1 and Class 2 NOTAMs?

Class I NOTAMs ( ICAO ): NOTAMs distributed by means of telecommunication. Class II NOTAMs ( ICAO ) or Published NOTAMs : NOTAMs distributed by means other than telecommunications. In the United States these NOTAMs are published in the Notices To Airmen Publication ( NTAP ) which is issued every 28 days.



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The Federal Aviation Authority requires flight crews to review NOTAMs before every flight for safety reasons. Without access to this information, a plane cannot legally depart, because there may be an unknown hazard ahead.

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For example, within the airplane category, there are four classes of airplanes, such as:
  • Single-Engine Land.
  • Single-Engine Sea.
  • Multi-Engine Land.
  • Multi-Engine Sea.


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The Federal Aviation Regulation (FAR) Part 91.119 indicates that, except when necessary for departure or landing, the minimum altitude over urban areas is 1,000 feet above ground level (AGL) and 500 feet AGL over rural areas.

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