Two more Air India pilots could not clear the preliminary dope test ordered by the Tata-owned airline following the incident on the Phuket-Delhi flight that left many injured.

The results of the final test are awaited, sources said. The two pilots have been de-rostered in the meantime.

Over 300 Air India pilots have gone through the test process so far. The results of the final drug test usually take 24-48 hours to come, sources said.

A cabin crew member aboard the flight was believed to have submitted a complaint alleging the pilot had earlier smoked “pot”.

The flight that triggered these actions by the airline authorities involved an Airbus A-320Neo. The aircraft had violently dropped 300 feet, indicating there was a total and simultaneous loss of key control surfaces, including the elevators and ailerons, for four seconds. The spoilers also lost control as a consequence of the same hydraulic failure.

During those four seconds, the elevators and ailerons of the A-320Neo drifted on their own without any pilot command following multiple failures of the jet’s three hydraulic systems, unprecedented in operations of this type of airliner.