First flight of LCA Tejas Mk.1A will be in 2022, says HAL. Our detailed report on the type:
This appears to be a strategic decision rather than real capabilities deficiency. India wants to keep assembly line busy to maintain expertise but without producing suboptimal plane of LCA (Mk1 & Mk1A). Instead the intention is only to maintain expertise so that teething effect will be minimal when MWF is manufactured
The Mk1A is MK1 with some peripheral addition like gun, AESA, few software upgrade etc. These things are not major enough to warrant delay. India already has made progress in these segment too and hence very little technical delay is possible.
India appears to be trying to ensure that MK1-MK1A-MWF are manufactured continually without any discontinuation. So, according to timeline of MWF, the timeline of MK1A will be varied. It is likely that the assembly line will be only for 8 planes a year for next 3 years. IAF strength will be maintained by Su30 in meantime