My take on a comprehensive evaluation of C17, or alternatives to replace IL 76!
To make it clear once again, I am not against the C17 in general, but besides the questionable way this deal was pushed through, I don't see how they can be the best for our forces, at such high costs!
The main roles of these transport aircrafts in IAF are cargo, troop/paratroopers and vehicle transports, mainly in India itself, but sometimes also abroad. For example in exercises (Red Flag, Garuda), or desaster relief missions, even in war szenarios that requires a rapid troop build up like we saw during the Maldive crisis in 1988 (
1988 Maldives Coup - Wikipedia, the free encyclopedia ).
The latter could also be needed in a hypothetical Indo – Chinese crisis, for rapid troop build up alongside the north eastern borders and that's why the capability to land and to take off from unprepared airstips might be important for IAF.
IA already expressed interest in lighter and air transportable equipment, like new wheeled and tracked IFV / tank destroyers, as well as self propelled howitzers like the Stryker, or the Archer artillery system (although I would suggest the Patria AMV, CV90 and the Atillery Gun Module / Donar, like I meantioned here:
http://www.defence.pk/forums/1336834-post43.html), not to mention that we already have big numbers of BMPs in various versions and they they seems to be a focus on lifting MBTs in such situations too.
So if we take these points as the most important requirements and compare the IL 76MD that we have right now, with possible replacements like C17, or the A400, it looks like this:
As we can see here, the IAF IL 76 neither can take off, or land on unprepaired airstrips, nor can it carry MBTs. The C17 instead can do it, but the difference in general lift performance is rather small, because the maximum payload is not the only factor that decides about the lift performance, but the size of the cargo hold too!
An IL 76 can carry the weight of the T90, but the cargo hold is not wide enough (T90 width 3.78m / IL 76 cargo hold width 3.45m), on the other side an A 400 has STOVL capabilities and the cargo hold has the size to carry T90, but it doesn't have the payload. So the biggest advantage of C17 is, that it combines it all in one, STOVL, high payloads and a big cargo hold!
However, does this justify these high costs of around $580 million each? Imo no, because like the comparison also shows, IAF could get 2 x A400 for 1 x C17, can still safe more than $100 million and would get even better lift performance in nearly all fields, except MBTs carrying capability (I know that means more crew is needed too, but I will explain it later)!
Moreover, the C17 is a dedicated transport aircraft only, while the A400 is a multi role aircraft, designed for the same roles like the C130J, but capable enough to fulfill the strategic lift roles similar to C17 too! That means 2 x A400 can be used for the same transport role as a C17, but if not needed, can be used in the mid air refuelling role (for fighters, transport, or AWACS aircrafts and even helicopters), for special ops, or as a MEDIVAC too.
The tanker capability is a very interesting point here, although an A400 tanker can't replace a dedicated tanker like an IL 78, or A330, it can refuel helicopters and IAF has expressed interest in aircrafts for these roles too. That means buying A400 MRTTs safes money to buy dedicated tankers for the helicopter refueling role.
We also have to keep in mind, that IAF seems to be happy with the 48t payload, that the IL 76 offered so far, because even when they send spares, supplies and ground crews to exercises like Red Flag, or Garuda, IAF send only a single IL 76 alongside IL78 tankers (Singapore Airforce send a tanker and a C130 only). So how often does IAF really need the full 77t payload of the C17 and how often does they have to fly with half load only?
In this case, 2 x A400 would give them way more flexibility for transports, numbers of available aircrafts and would be more cost-effectiveness too, beacause even if we have to send one of them abroad, we still have enough of them at home and wasn't insufficient numbers of aircrafts the real problem for IAF?
IAF?s strategic airlift capability: