General phraseology

Some abbreviations, which by their common usage have become part of aviation terminology, may be spoken using their constituent letters rather than the phonetic alphabet, for example, ILS, QNH.

The following words may be omitted from transmissions provided that no confusion or ambiguity will result:

  • “SURFACE” in relation to surface wind direction and speed
  • “DEGREES” in relation to radar headings
  • “VISIBILITY”, “CLOUD”, and “HEIGHT” in MET reports
  • “HECTOPASCALS” when giving pressure settings.

The use of courtesies should be avoided.

The word “IMMEDIATELY” should only be used when immediate action is required for safety reasons.

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