The last such lapse was reported by IANS on April 12, when IndiGo's Delhi-Mumbai flight had to perform a mid-air "turn back" manoeuvre on April 10.
That time, sources had told IANS that the manoeuvre was performed after excessive vibration was noticed from aircraft's engine number two.
"Currently, airworthiness and air safety teams of the DGCA are conducting complete review of engineering and maintenance processes," a source told IANS.
The three-day audit started on Monday.
Later in a statement, DGCA said: "We do detailed audit of all airlines at least once in a year. IndiGo's is this month. Every audit involves some actions."
The DGCA further said that "in such audits, current safety issues remain quite a focus."
"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.
Excessive vibration resulting in midair "turn backs' has emerged as the most common and serious safety issue with the P&W engine-powered Neos.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)