The notices were issued to the pilots, as also Jet's chief operating officer and training chief, on the basis of an audit of its training programme by a three-member DGCA team.

The DGCA, through the show cause notices, asked these pilots why their licenses should not be suspended as they were flying without clearing their Pilot Proficiency Check (PPC) tests, which have to be carried out every six months.

The audit was ordered after one of the airline's planes plunged several thousand feet while flying over the Turkish airspace on the Brussels-Mumbai route early last month.

When contacted, a Jet Airways spokesperson said the airline "has not seen the report from the DGCA nor has the airline been advised on when it will be received. We therefore cannot comment on the so called findings in the report or the speculation in the media."

"However we are confident that our training meets all DGCA and international standards and that we will be able to resolve any discrepancies or address any observations, however minor, once we have the report and can discuss the findings with the DGCA," the spokesperson said.

Maintaining that safety of passengers and crew "remains our paramount priority", she said, "We will work closely with the DGCA to swiftly resolve any issues that may be highlighted by the authorities."

Airline officials said they would be seeking a meeting with the DGCA soon.

While Jet was asked to ground three pilots "whose training was found to be deficient", the DGCA also proposed action against some of the airline's trainers who "imparted deficient simulator training to pilots", DGCA officials said.

After the August eight incident involving the Jet flight over Turkey, the regulator conducted the audit from August 20 -22, claiming to have found discrepancies of "serious nature".

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