New Delhi: Trouble has mounted for the pilot-in-command (PIC) of an Air India Phuket-Delhi flight after he reportedly failed a confirmatory dope test and was found to have consumed marijuana.

The incident involved Air India flight AI 2379, which was badly rattled during its journey last Tuesday, leaving 20 passengers and four cabin crew members injured. The young co-pilot reportedly had to take control of the aircraft and safely land it in Delhi.

According to reports, cabin crew members have also complained to the airline about the PIC’s behaviour during the flight. Sources claimed that the pilot appeared to be under the influence of psychoactive substances and was unable to properly control himself.

The pilot could face criminal action in addition to regulatory proceedings under Directorate General of Civil Aviation (DGCA) rules. Under existing regulations, a pilot who tests positive for drugs is required to undergo de-addiction treatment and can return to flying only after being certified drug-free.

The incident has also drawn the attention of the Civil Aviation Ministry. The ministry summoned Air India’s outgoing CEO Campbell Wilson to discuss the matter and the airline’s handling of the incident.

The Airbus A320 reportedly experienced a brief “negative G” situation during the flight, causing the PIC and objects inside the cockpit to become airborne. Passengers who were not wearing seat belts were injured.

The Aircraft Accident Investigation Bureau (AAIB) is investigating whether the sudden loss of altitude was caused by multiple technical issues reported by the co-pilot or by the actions of the PIC.

The Aviation Ministry said that certain records, statements and medical information collected during the investigation are confidential. It also urged people not to draw conclusions before the investigation is completed.

The DGCA is reportedly examining whether existing drug-testing rules for pilots need to be made stricter following the incident.