Thanks for all the informative replies...
As many of you know, I design RNP procedures. What I am looking at is a single RNP track, but with offset approaches for wake turbulence separation. The standard would be to have completely separate procedures, but then ATC has to track many more waypoints, so I am working up this concept...
While I did find significant verbiage on engaging the offset, there was little in the way of parameters when removing the offset. Horizontal return is somewhat detailed, but in actual operation, 'up to' can be very different.
In addition, and to be more specific, if the AC is on descent, will the FMC allow the removal of the offset while on auto?
Thanks in advance.