Editing Avionics (section)

===Communications===

Communications connect the flight deck to the ground and the flight deck to the passengers. On‑board communications are provided by public-address systems and aircraft intercoms.

The VHF aviation communication system works on the [[airband]] of 118.000&nbsp;MHz to 136.975&nbsp;MHz. Each channel is spaced from the adjacent ones by 8.33&nbsp;kHz in Europe, 25&nbsp;kHz elsewhere. VHF is also used for line of sight communication such as aircraft-to-aircraft and aircraft-to-ATC. [[Amplitude modulation]] (AM) is used, and the conversation is performed in [[Simplex communication|simplex]] mode. Aircraft communication can also take place using HF (especially for trans-oceanic flights) or satellite communication.

{{See also|Aircraft Communication Addressing and Reporting System}}