Gosh! We have wandered a long way from RadAlts!
The stuff inside the sharpish end of the Hunter was always called that.
- not by most of us. AI means 'Airborne Intercept' and by the time you get to a guns kill the 'intercept' is over. 'Radar Ranging' is a more correct name. I believe the Google book to be incorrect in describing the RR in a Hunter as 'AI'.
Apart from some ex Navy two-seaters (T8?), Hunters, as far as I know (and no doubt John Farley will correct me) never had intercept radar fitted and were vectored into visual range on its targets by ground control. The exception was, I understand, a 'one-off' conversion to train naval Sea Harrier pilots in AI use.