IndiGo has 32 Pratt and Whitney engine planes out of which nine were grounded, and GoAir has 13 Pratt and Whitney engine planes out of which three were grounded by the DGCA yesterday.
The grounding follows the emergency landing of an IndiGo A320neo in in Ahmedabad on a service from Lucknow on 12 March.
"EASA has informed that they are evaluating some interim proposals and will be revising the emergency airworthiness directive in due course as soon as the current affected engines will be modified with a safer interim design".
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According to the regulator, P&W in its latest communication has also not given any firm commitment as to when the issue on the engine post serial number 450 would be resolved.
While the decision was made keeping in mind the safety of operations, hundreds of passengers - especially of IndiGo Airlines and GoAir - were forced to change their travel plans and some remained stranded at airports. The IndiGo airlines also expressed regret after thousands of passengers who faced inconvenience during the immediate grounding.
In February, the USA aviation regulator said the Pratt & Whitney engines pose a shutdown risk, following similar action by European regulators that month.
A320 neos with even one Pratt engine featuring a seal found to cause vibrations are no longer allowed to fly, India's Directorate General of Civil Aviation said in a statement Monday. In an emailed statement to Bloomberg, the company said that it was working with its clients so that there is no disruption in operations and has already started delivering engines with the "upgraded configuration". "We are working to mitigate the Aircraft on Ground (AOG) situation by the end of the second quarter", it added. Currently, IndiGo, with a market share of 40 %, operates a fleet of 155 A320 aircraft, including 45 A320neos (new engine option); 7% of these are now grounded.