New Delhi: India’s largest airline IndiGo on Wednesday said it has grounded several Airbus A320neo aircraft, and is awaiting spare engines from United Technologies Corp.’s Pratt & Whitney (PW).

The company did not specify how many aircraft have been grounded, but news agency PTI reported it as five.

The grounded aircraft had reported glitches in the engines. InterGlobe Aviation Ltd, which operates the budget airline, said in a statement that a few A320neos have been taken out of service proactively as the company waits for spare engines.

“The release of additional spare engines has been initiated by PW so that all aircraft are expected to be back in service in the second half of August," said the statement.

IndiGo had to ground several Airbus A320neo aircraft powered by PW engines in March following certain glitches. The airline had selected A320neo aircraft with its 15% extra fuel-efficiency in mind at a time when jet fuel price was rising. The airline gets compensated for the revenue loss from grounding of aircraft.

The company, which is in expansion mode, is currently working on strengthening operational areas and customer interface ahead of scaling up international flights.

After a recent leadership change, the company is also reviewing areas impacting profit, ways of reducing risk and tackling competition from other low-fare and full-service rivals.

India’s airline industry is set for a major expansion with most airlines readying for a large number of new aircraft induction over the next few years, while the government is focusing on promoting regional connectivity and infrastructure upgradation.