All civil aircraft are required to have radio equipment with 8.33 kHz capability by January 1, 2018.
What is 8.33 channel spacing? | Aircraft radio systems transmit on a Very High Frequency (VHF) band between 117.975 and 137 MHz. The number of available VHF assignments has increased over the years by splitting the radio spectrum into narrower bandwidths from 50-kHz to 25-kHz channels. The bandwidth supports 760 channels, if channels are spaced by 25 kHz.
Who requires 8.33-kHz radios? | Any aircraft operating above FL195 within European airspace must be equipped with 8.33-kHz radios per European Commission (EC) Regulation No. 1265/2007 dated October 27, 2007. And by January 1 2014, any general aviation aircraft operating instrument flight rules (IFR) had to be equipped with 8.33 kHz-capable radios. By January 1, 2018, all aviation radios operating in ICAO EUR regions must have 8.33-kHz channel spacing capability.
With new regulations requiring 8.33-kHz channel spacing below FL195, all operators – who do not already have mandated radio frequency capabilities – will need to consider radio equipment upgrades in the near future.
> Read European Commission Regulation No. 1265/2007