Originally Posted by
Wycombe
Thanks, I had a feeling (and remember previous discussions) that it was to do with terrain in the undershoot. As you say, it seems the extension at the other end introduces further difficulties.
Wouldn't agree that there are "difficulties", more a case of limiting options. The worldwide move away from ground based navaids is underway. Its a very attractive move for aerodrome operators, no ILS localiser/glidepath/DME equipment to purchase/install/maintain/get flight checked every six months. If the UK can buy in to the necessary satellite technology RNAV-LPV IAP is the way to go. It has already been demonstrated to be capable of CAT III operation, albeit due to off-airport obstacles CAT 1 is the best that SOU could expect.