The company is also working to assess an overall industrial and delivery plan to minimise customer disruption.
IndiGo, a low-priced Indian airline, withdrew from service three jets and canceled some flights as a result. "This issue is isolated to a limited subpopulation of engines", it added.
Pratt & Whitney and Airbus are working to resolve a new problem with some of Pratt's geared turbofan engines that resulted in the grounding of several Airbus A320neos in India over the weekend, company and European air safety officials said.
Following this problem, IndiGo has already grounded three A320 neo planes that are powered by P&W engines.
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There are 43 engines installed on 32 aircraft affected by the latest problem, 21 aircraft have one engine with the modified configuration, and 11 aircraft have both engines with the new configuration. Indigo yesterday said it had suffered three in-flight shutdowns, while pilots have had to turn back before taking off in three other instances.
European aircraft manufacturer Airbus SE said on Monday that India has 14 A320neo aircraft where at least one PW engine is in the faulty category. Airbus selected the PW1100 as the launch engine for the A320neo (new engine option) aircraft family, based on its fuel efficiency, noise reduction, and lower Carbon dioxide and NOX emissions.
IndiGo and GoAir are the two domestic carriers that operate A320neo planes powered by P&W engines.
Greg Hayes, chief executive officer of United Technologies, said last April that Pratt incurred costs that weren't material to retrofit the engines and for "helping the airlines through some of this". "In late January and early February of this year, four of these modified engines did not perform as anticipated", the company said.
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IndiGo said Saturday that it cancelled some flights after the European Aviation Safety Agency warned of a new issue with the engines and said it was investigating.
The European regulator said operators with aircraft using two affected engines must stop flying them within three flight cycles.
Airbus has also issued an alert for providing instructions to de-pair the affected engines and discontinue extended-range twin-engine operations for aircraft fitted with affected engines.
The product safety boards of Pratt & Whitney and Airbus have decided that "all neo deliveries are postponed till further notice", IndiGo spokesman Ajay Jasra reportedly said.
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He also noted that Dantonio and Izzo have been asked to "refrain from comment" while the school is in the reviewing process. Asked respond to Engler's comments, ESPN said - in an email sent to 97.1 The Ticket - "We stand by our reporting".