The moves comes hours after of engine failure was reported on an A-320 Neo when an IndiGo aircraft took off from Ahmedabad for Lucknow on Monday.
With this, all the A320neo aircraft with PW1100 engines beyond serial number 450 have been taken off operation in India.
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The Directorate General of Civil Aviation in its statement has asked the airlines not to refit the affected engines. The DGCA added, "P&W in their latest communication has also not given any firm commitment as to when issue on the engine post serial number 450 will be resolved and informed that all the affected engines will be replaced by early June, 2018".
The European Aviation Safety Agency has ruled that operations with one defective engine should be permitted provided affected planes don't undertake extended flights over water, where they're more distant from diversionary airports in the event of an emergency.
Pratt & Whitney said in an emailed statement that it's working closely with customers to minimize disruption and has already begun to deliver engines with the "upgraded configuration".
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The DGCA official said since then, there have been three cases of the in-flight shutdown of A-320 Neos fitted with one affected PW1100 engine. It and GoAir said they'd complied with the DGCA directive.
That's not acceptable, according to Indian regulator DGCA, which said the manufacturer had "no concrete proposal in place at this stage".
DGCA said it has not got a "firm commitment" from the U.S. engine manufacturer on addressing fresh safety concerns, which forced it to ground the fleet.
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IndiGo and GoAir have a total of 32 and 13 A320neos in their fleet, respectively.