KEETARP
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For high altitude tests, i believe engine performance is one of them among others.
LCA trials at Leh were deemed success.
Grippen has done it.
So what is that both share, Engine technology.
Thus with this logic, F/A-18 seems to be the other candidate who must have passed the Leh trials.
As without engine, the trials won't be success.
And all 3 share the same engine or its technology.
No Taimi , Engine performance is not the factor . I also thought that initially but its a different case .
And Tejas is underpowered if you take the performance of Ge404
If you look at the T/W ratio of all jets with meaningful combat load ( 60-70% int fuel and 3BVR+2Wvr missile +2 A2S weapon+ 1Droptank/Pods/Jammer)
Only Eurofighter and Mig35 have T/W ratio more than 1ne ( Mig35 best having 18000kgf / 17500 typical combat load ).
If Gripen c,d with GE404 having T/W ratio near 1 or less have cleared , F16 must have done it easily.
if you read the Press release , Leh trials for others were minor problems and they cleared all jets by asking manufacturers for minor modifications
Its the reliability of Avionics and subsystem to perform at low temp.
Swedish winter tests for NG had -31temp so it got cleared in LEH.
F16 may be the other one - Alaska & Norway experience. And history of operation at in Colorado springs .
F18E - Have never seen such thing , Canada only operates them but Avionics change are too much in newer one to be reliable in LEH.
Mig35- same case as F18 , Serbia had old Mig29 but newer ones have different avionics altogether.
Rafale - Have never seen such conditions
Eurofighter - Is the one doubtful bcoz it was rumoured to have operated in Sweden at -30temp .