A Jet Airways flight from London to Mumbai set off panic while flying through German airspace recently, after the pilots did not respond to communication from air traffic controllers for about 25 minutes.
The incident happened just a few days after the mysterious disappearance of Malaysian airlines flight MH370, which heightened the seriousness of the case.
It was not immediately known how many travellers were on the aircraft, a Boeing 777-300ER, which has a seating capacity of 312.
The case was investigated by the Directorate General of Civil Aviation (DGCA), which received a complaint from the German air traffic control on March 13.
The two pilot on the Jet flight 9W 117 were taken off the roster for two weeks, during the course of the inquiry.
The DGCA inquiry found out that the pilots had taken off their headsets and did not hear the communication as the audio volume was low.
Communication was re-established after the air traffic controllers sent a text message to the pilots through the Aircraft Communications Addressing and Reporting System (ACARS), a satellite-based system, and the pilots responded to the traffic controllers.
Jet officials also joined the DGCA in the inquiry into the case. "Based on the investigation report, Jet Airways has ensured strict disciplinary action against the pilots. The report has been sent to the German authorities for closure," said a spokesperson for the airlines.