U.S., April 17 -- India's civil aviation regulator will conduct a special safety audit of the low-cost carrier IndiGo following concerns about the snag-ridden Pratt and Whitney (P&W) engines, which power the airline's A320 Neo aircraft.

While an annual audit of IndiGo was due in April, a special Directorate-General of Civil Aviation (DGCA) review will also be done of the airline's operations and engineering departments.

"We confirm that there is currently a DGCA audit of IndiGo, which is combined with the annual main base audit. IndiGo has received a limited number of show-cause notices. IndiGo has responded accordingly and we can only comment on this matter after we have a discussion with the DGCA," the airline said in a statement.

An...