[cmdr straker]

Once a airframe has a faa cert when you make a modification it is a simple cert.
as in
B-52a
b-52b
b-52c
b-52d e,f
B-52g & h
Kc-135a
KC-135R. did not take long for those to get certed after inital certs.

Where is the FAA cert on the KC-45.
you know hte one that has not passed gas and does not have a boom.

[MHalblaub]

Where is the FAA cert on the KC-45.

http://rgl.faa.gov/Regulatory_and_Guidance_library%5CrgMakeModel.nsf/0/A13F17EE472B320B862574740049BEEE/$FILE/A46NM.pdf

RAAF KC-30B are Airbus 330-203.

It may be easy to certify a KC-767AT but that won't make 767-200LRF an existing airframe.
Never build,
never flown,
never tested.