"There was loss of oil in the one of the engines which led to its mid-air failure and the subsequent emergency landing of the plane," the Directorate General of Civil Aviation (DGCA) official told PTI.
When contacted, IndiGo sought to downplay the incident, terming it a "technical glitch".
"IndiGo flight 6E7123 which was operating (on November 4), on Rajahmundry-Chennai route suffered a technical glitch in one of its engines just before landing at Chennai", an IndiGo spokesperson said in a statement.
The aircraft landed safely, it added.
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