An IndiGo flight en way to Udaipur returned to Delhi on Thursday owing to "engine vibrations," and the jet has been grounded, according to a senior Directorate General of Civil Aviation (DGCA) official, news agency PTI reported.
The DGCA will investigate the incident.
This was the second occurrence on Thursday with a jet returning to the Delhi airport owing to technical difficulties.
According to the official, the IndiGo flight from Delhi to Udaipur, operated by an A320 neo aircraft, made an air turnback due to vibrations in engine 2.
The jet safely landed and was grounded. The DGCA will undertake a thorough investigation into the event, according to the official.
According to a statement, the airline's Airbus aircraft 6E-6264 from Delhi to Udaipur returned to Delhi owing to a technical issue.
"All passengers were accommodated on another aircraft which operated to Udaipur," it added.
Earlier in the day, an 89-passenger SpiceJet flight from the national capital to Nashik was forced to return midway owing to a "autopilot" malfunction. The DGCA will also investigate this occurrence.
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In August, the right engine of a Mumbai-bound IndiGo aircraft, which had 187 passengers on board, developed a snag at Goa Airport while proceeding to the runway, PTI reported. As the engine snag was detected, a Navy team was called in to help rescue the passengers.
The aircraft was taken to the taxi bay by the Navy teams for necessary inspection. The Goa airport is a part of the Navy's INS Hansa base.
On July 29, an IndiGo plane from Assam's Jorhat to Kolkata skidded off the runway during take off, and a pair of its wheels got stuck in the muddy outfield, leading to the flight being cancelled.
(With Inputs From PTI)