Officials recently caught two Air India crew members while they were allegedly smuggling three kgs of gold worth over Rs 78 lakh on a domestic flight, the department has informed the airline.
Sources said the department has also said that pilots and cabin crew members of Air India are posing "significant security risk" by exiting terminal 2 of the Chhatrapati Shivaji International Airport in Mumbai without customs check.
The sources said the department has also cited the instances of the two crew members -- Nihal Prajapati and Sidhesh Patil, who were caught for the alleged gold smuggling.
The department had directed Air India to ensure that all its crew members and pilots conform to procedure at the airport, saying any deviation would be "viewed seriously", the sources said.
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According to official sources, the DRI has also cited some past incidents of gold smuggling by Air India staffers in its missive. The DRI is understood to have sought a detailed inquiry report regarding those held for illegally bringing gold into the country.
In October that year, 32 kgs of gold biscuits, worth Rs 15 crore in the international market, were recovered from the lavatory of an Air India plane when it reached Chennai from Dubai. Four persons were later arrested in the case, the sources said.