Budget airline IndiGo today said deliveries of A320 neo aircraft that are powered by Pratt & Whitney engines have been put on hold by Airbus and the engine maker.

An issue with some engines built by Pratt &Whitney could ground some Airbus planes and limit how long others can fly.

The issue is the latest in a string of problems that have bedeviled the GTF program.

Pratt & Whitney, with the support of Airbus, is in close contact with the airline to address the results of a recent finding related to the issue, it added.

According to the statement, the grounded aircraft are powered by Pratt & Whitney engines and the move follows a directive from European aviation safety regulator EASA. If an aircraft has only one engine with the aft hub modification, it must stop flying extended routes over water within one flight cycle, EASA says.

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'The recommendations are with respect to a certain sub-population of engines, with a particular engine configuration.

Indian budget carrier IndiGo, said it had carried out 69 Pratt engines replacements in 18 months, after multiple inflight shut downs and turn backs, adding replacements were the best possible precautionary measure.

In a statement, IndiGo said it had proactively withdrawn the three A320 neo aircraft from service from February 9. Airbus has issued an Alert Operators Transmission (AOT) providing instructions "to de-pair the affected engines and discontinue [ETOPS] for aircraft fitted with affected engines", according to EASA.

About 113 Pratt & Whitney engines now equip the A320neo family of aircraft, which are used by 18 customers.

Not all of the engines are affected by the issue, though the spokesperson declined to say how many. "The aircraft have been grounded for technical reasons", the spokesperson said.