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‘Zero’ Vs. ‘Sierra’

ForeFlight’s time and distance rings on the moving map can serve as a visual reminder of when to complete the in-range check as you approach the destination airport. Flying
Gemini Sparkle

Key Takeaways:

  • Pilots often encounter ATC confusion between the number "zero" and the letter "S" (Sierra) when communicating aircraft registration numbers, especially if "zero" is the final digit.
  • There is a notable safety gap between commercial and general aviation, with GA experiencing significantly more fatalities, leading to calls for improved safety in general aviation through standardized procedures.
  • A reader questioned a diagram depicting Angle of Attack (AOA) in an article, prompting clarification that different FAA diagrams, while both official, illustrate distinct aspects of AOA and the effect of flaps.
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Because the final alphanumeric symbol in my aircraft’s registration is the number “zero,” (such as N67890), there is the occasional mixup by ATC, with a readback of “Sierra,” for the letter “S” instead of the number zero. This happens at times even though I am always careful to enunciate “zero” as clearly as I can (Zee-Row). Part of the occasional confusion is probably the fact that the zero comes at the end, where more often than not there is the expectation of a letter. I would venture a guess that there are more zero/sierra mixups than anything to do with the numbers three (which we are supposed to say as “tree”) or five (which we are supposed to say as “fife”). Although I suspect the chances of the FAA or ICAO (or whoever is in charge) changing the letter “S” designator to something other than “Sierra” is near zero. Any thoughts? Thanks.

William Cole – Petaluma, Calif.

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