Most of the pilots currently make onboard announcements in English.
"They should do so in Hindi as well, as it is our national language. We will encourage them to use Hindi in the cockpit while making onboard announcements," Air India sources said.
The issue had come up for discussions during a recent meeting of the civil aviation ministry and the airline management, sources said, adding that it was decided to reiterate the earlier instructions in this regard.
The aircraft operating staff has also been told to maintain the record of announcements made by the pilots along with other flight details, they said.
Immediately after coming to power last May, the Narendra Modi-led NDA government had stressed on the use of Hindi in public offices as well as in public life.
"I have taken a decision that we will give priority to the promotion of Hindi in all communications... Because it is our official language," Minister of State for Home Affairs Kiren Rejiju had said last June.