NEW DELHI--India's civil aviation regulator will likely decide later Tuesday on whether to lift an over three-month-long ban on Boeing 787 flights by flag carrier Air India Ltd., a senior aviation ministry official said.

The regulator had grounded Air India's fleet of six Dreamliners in mid-January, matching an order by the Federal Aviation Administration on U.S.-registered 787s after lithium-ion battery malfunctions on two separate flights operated by Japanese carriers raised safety concerns.

The ministry official, who declined to be named, told The Wall Street Journal that Boeing Co. has finished installing new battery systems on one of Air India's Dreamliners, a process that was monitored by the nation's Directorate General of Civil Aviation.

The official said also that a team from the U.S. aircraft maker will update the regulator on the modification plans on the remaining five 787 aircraft.

"If we are satisfied about the work done on the first plane, then we will take a final decision on permitting flights on all the planes," the official said.

Though the official didn't give any timeframe for resumption of the 787 flights, it is likely that the aircraft can resume flying once the modification works are done if the regulator lifts the flight ban.

On Friday, India's civil aviation minister Ajit Singh that he expected Air India to resume commercial flights on the Dreamliners from mid-May, initially operating on domestic routes.

Executives from Air India couldn't immediately be reached for comment.

The FAA approved Boeing's new battery-system design on April 19, allowing airlines to begin modifying the 50 Dreamliners that have been delivered since September 2011.

Ethiopian Airlines became the first operator to restart 787 commercial flights on April 27, followed by Qatar Airways on May 1 .

The Boeing 787, which is more fuel efficient and cheaper to operate than many existing widebody aircraft, is vital to loss-making Air India's efforts to make a turnaround as it plans to deploy the fuel-efficient jets to fly to more foreign destinations. The airline had ordered a total of 27 Dreamliners.

Write to Santanu Choudhury at santanu.choudhury@wsj.com

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