London, Feb. 5 -- Britain's aviation regulator has sought clarification from Air India after a Boeing Dreamliner passenger aircraft departed London despite concerns over a potentially faulty fuel switch and was later grounded in India upon arrival for safety checks.

According to Reuters, the UK Civil Aviation Authority informed the airline in a letter dated February 3 that regulatory action could be initiated against Air India and its Boeing 787 fleet if a complete response is not submitted within a week.

The development comes amid safety checks across Air India's Boeing 787 fleet, with the airline completing inspections of fuel control switches on all its aircraft, sources said on Wednesday, after a pilot flagged a possible defect earl...