Can any ATC professionals tell me if there is an official definition of this term ? I hear it frequently from my local ATC unit, where it's sometimes qualified with the addition of 'limited to transponding aircraft only', 'limited due to altitude' or 'limited due to high ground/terrain'. Being a non-ATC person, I would have thought that RAS and RIS were absolute services, i.e. the pilot either gets the service or he/she doesn't, without conditions being applied by the radar controller.
All replies, rebukes etc. gratfeully read and digested.
Thankyou.
