"Ron Rosenfeld" wrote in message
...

I know of no such requirement for Part 91 flying. Block 9 of the FAA
flight plan, as described in the AIM, calls for the destination airport
identifier code (or name if the code is unknown), not for an IAF.

Although it is acceptable, and maybe preferable, to file "via" an IAF,
there is no "requirement" of which I am aware. In addition, there are
approaches for which there are no feeder routes from the enroute
structure,
so a blanket requirement makes no sense.


Unless the IAF is also part of the enroute structure it is unlikely to be
stored in the flight data processing computer. Filing one will cause your
flight plan to be rejected at some point, until someone corrects it by
removing the filed IAF!