New Delhi, Aug. 9 -- The Aircraft Accident Investigation Bureau (AAIB) is investigating an Air India flight from Phuket to Delhi on August 4 after the aircraft experienced a sudden loss of altitude of approximately 300 feet during cruise, following which the aircraft stabilised and subsequently landed safely at Delhi.

"The occurrence has been classified as a Serious Incident and is under investigation by the AAIB," the Ministry of Civil Aviation said in a statement on Sunday.

Both the pilots have been taken off from roster (removed from duty).

The statement added that the screening test of the Pilot-in-Command (PIC) showed that the result requires confirmatory testing.

During the occurrence, injuries were reported to a few passengers ...