Would have to do a little research on this one, but I'll start with a
guess...

The interface with the aircraft may have changed from a 'vanilla' missile
umbilical to the more advanced 1760 interface (such as used with AIM-120).
The internal aircraft wiring associated with the 'smart' interface may have
not been accounted for in the initial design (the short-range missile bays
were dedicated to the AIM-9). That said, I'd be surprised that the "Group
A" provisions (wiring) was not included as a 'hedge' against down the road
changes such as this one...

Another aspect to all of this could be the associated software code for
proper interface between aircraft and missile and calculation/display of
in/out of missile engagement zone for the missile.

Since I saw the post thought I'd offer up some possibilities, subject to
major correction of course by someone who knows something for sure....

Cheers

Mark


"Scott Ferrin" wrote in message
...

AIM-9X




"Integration of the missile on the Lockheed Martin F/A-22, which
requires internal carriage of the missile, has been delayed at least
until the spiral three (developmental) stage of the program around
2011."


SEVEN Y-E-A-R-S???? What's the holdup? They've already fired guided
-9Ms.