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Radio Communication. Reference. From the Ground Up Chapter 8.4: Radio Communication Procedures Pages 219 - 229. Introduction. There are guidelines and standard procedures for aviation radio communication.

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From the Ground Up

Chapter 8.4:

Radio Communication Procedures

Pages 219 - 229

  • There are guidelines and standard procedures for aviation radio communication.
  • It’s very important that pilots know these in order to communicate effectively around the world over aviation radio
  • Number, Alphabet, and Time
  • Standard Phrases
  • Communication Priority
  • Radio Technique
  • Emergency Communication
  • Pronunciation:
    • 0 ZEE-RO 5 FIFE1 WUN 6 SIX 2 TOO 7 SEV-en 3 TREE 8 AIT 4 FOW-er 9 NIN-er
    • Thousand: TOU-SANDDecimal: DAY-SEE-MAL
  • Examples:
    • 10 One Zero19 One Niner800 Eight Zero Zero11 000 One One Thousand
phonetic alphabet
Phonetic Alphabet
  • A Alfa N NovemberB Bravo O OscarC Charlie P PapaD Delta Q QuebecE Echo R RomeoF Foxtrot S SierraG Golf T TangoH Hotel U UniformI India V VictorJ Juliet W WhiskeyK Kilo X X-rayL Lima Y YankeeM Mike Z Zulu
  • 24 hour system used to express time:
    • 12:00 midnight 000012:30 am 00302:15 am 02155:45 am 054512:00 noon 12003:30 pm 153010:50 pm 2250
  • In aviation, co-ordinated universal time (UTC, Z, or zulu) is normally used
standard phrases
Standard Phrases
  • Acknowledge Let me know you have received and understood this message
  • Affirmative Yes
  • Break I hereby indicate the separation between portions of the message
  • Confirm My version is… is that correct?
  • Correction I have made an error, the correct version is…
  • Do you read? I have called you more than once, if you are receiving me, reply
  • Go ahead Proceed with your message
standard phrases1
Standard Phrases
  • How do you read me? Can you hear me clearly?
  • I say again I will Repeat
  • Negative No
  • Out My transmission is ended, I do not expect a reply from you
  • Over My transmission is ended, I expect a reply from you
  • Read back Repeat this message back to me after I have given “Over”
  • Roger Okay, I have received your message
standard phrases2
Standard Phrases
  • Say again Repeat
  • Speak slower Talk more slowly
  • Stand by I must pause for a few seconds
  • That is correct You have the correct information
  • Verify Check with the originator
  • Wilco Your instructions received, understood, and will be complied with
communication priority
Communication Priority
  • Communication over the radio follows the following priority:
    • Emergency communications (Distress and Urgency)
    • Flight safety communications (ATC clearances, airport advisories, position reports, flight plans etc)
    • Scheduled broadcasts
    • Unscheduled broadcasts
    • Other air-ground communications
radio technique
Radio Technique
  • Call-upCity tower, this is Cessna one seven two foxtrot juliet echo sierra, (over)
  • Reply Foxtrot juliet echo sierra, (this is) city tower
  • Message City tower, foxtrot juliet echo sierra is transiting through the zone eastbound en route to Oshawa
  • Acknowledgement Foxtrot juliet echo sierra, city tower, cleared through the zone
  • End Foxtrot juliet echo sierra, (out)
communication checks
Communication Checks
  • Radio operators can request radio checks to determine Readability and/or Strength
  • Number Readability Strength
    • 1 Unreadable Bad
    • 2 Readable now and then Poor
    • 3 Readable with difficulty Fair
    • 4 ReadableGood
    • 5 Perfectly Readable Excellent
  • Distress call is made when an aircraft is in grave and imminent danger and requires immediate assistance
  • Distress call: Mayday – Mayday – Mayday
  • If in distress, the first call should be made on the air-ground frequency in use
  • If no reply on current frequency, switch to distress frequency: 121.5 MHz
  • Urgency call is made to a specific station when there is a an urgent message about the safety of a ship, aircraft or person on board or within sight
  • Also can be used if an aircraft is having difficulties, but immediate assistance is not required
  • Urgency call: Pan Pan – Pan Pan – Pan Pan
  • Safety call indicates that station is about to transmit an important navigation or weather warning to aircraft in flight
  • Safety call: Security – Security – Security