A radio service intended for the transmission of informa-
Aeronautical fixed service tion relating to air navigation, preparation for, and safety
of flight is called.
Aeronautical ground stations Aircraft stations are allowed to contact.
3-30 MHZ Frequency range for High Frequency (HF)
The VHF universal simplex channel for emergency and
121.5 MHZ
distress communication.
Pan Pan Pan The international radio telephone urgency signal
121.5 MHZ / 243 MHZ The Emergency Locator Transmitter (ELT) frequency
Volt-ohm meter It is not a radio navigation aid
International Civil Aviation Organization The meaning of ICAO
United Nations The meaning of UN
Commissioner Head of the NTC Commission
Calling Frequency - an agreed upon frequency where
WORKING FREQUENCY stations attempt to contact to each other, once contact is
made, stations move to a
3-30MHz Frequency used for sky wave propagation
Your instructions received, understood and will be com-
WILCO
plied with.
MAYDAY The spoken word for distress communications.
Spoken at the end of a transmission to indicate to the other
OVER station that it is their turn to transmit. "My transmission is
ended and I expect a response from you".
International expression to indicate that silence has been
SEELONCE imposed on the frequency due to a distress situation. The
aeronautical phrase is "STOP TRANSMITTING."
1/4