If these two aircraft can meet all of the RAAF's fixed wing transport requirements, along with high and low speed IFR tanker roles, it seems to make sense but I wonder if there is a 'middle' area where the C-17 would be too large and the LTFWA too small.
What percentage of C-130 missions could be picked up by the C-17 at the top end and the C-27 or C-295 at the other? Would there be a case to retain a three aircraft fixed wing transport force, with an additional 4 C-17s replacing the remaining C-130Hs and sufficient LTFWA to replace the Caribous along with some C-130H missions? This would provide a force of approx 8 C-17s, 12 C-130Js and how ever many LTFWA aircraft are needed to meet the remaining fixed wing tactical requirements.
Tas
CDE/Air8000 is holding off on going for additional C-130Js until they see what is happening with the A400M - that's a far more likely and needed capability than extra Js...if it ever gets going! Plus it will come with an organic A2A refuelling capability as well.
There is still a need for a medium/heavy transport in the middle ground, as there are soft fields the C-17 will never get into that the Herc or A400M can, e.g. Op PNG Assist recently.
There may be room for one or two more C-17s to optimise the fleet utilisation, but I can't see any more than that being ordered. The 3rd aircraft arrived at AMB yesterday (11 Feb) and the fourth is due to arrive in march. FOC won't be declared until the sim, hangars, and new 36SQN facilities are complete next year.
Although it is about 2/3s as capable as a C-130J, the C-27J can perform about 90% of the missions currently commonly undertaken by RAAF Hercs.
Magoo
(the "plane spotter", apparently!)