We are having a discussion in our group about RNAV approaches and why some approaches have arrival waypoint restrictions. Take for example : http://22.214.171.124/d-tpp/1108/00015R24.PDF" onclick="window.open(this.href);return false;
"Procedure NA for arrivals from v-xxx or v-xxx or v-xxx"
My hunch is the restrictions are based upon incoming / outgoing traffic and they don't want planes to double back 180 to get to the IAF. However, the conversation has become, well, why don't they have these same restrictions for fields that have NDB approaches. In some cases you may be flying right down the outbound radial, fly over the station, turn 180...head outbound, do your PT and head back in.
Take for example : http://tiles.skyvector.com/sky/files/tp ... 31ND11.PDF" onclick="window.open(this.href);return false;
If you were coming in from the northwest you would fly all the way to the field, do a 180 and begin your procedure at UPAKY. No restrictions.
So, the root question, why restriction on RNAV.