New Delhi/IBNS: The preliminary report of the Air India plane crash that killed at least 270 people has been submitted to the government, media reports said.

The Aircraft Accident Investigation Bureau (AAIB) sent the report to the Civil Aviation Ministry and other concerned authorities.

The report will be made public later this week, reports claimed.

Despite initial doubts, the AAIB succeeded in recovering the Crash Protection Module or CPM and the memory module.

The data has been downloaded.

The black box comprises a Digital Flight Data Recorder (DFDR) and Cockpit Voice Recorder (CVR), which were heavily damaged.

What is a black box?

A black box refers to two critical flight recording devices on an aircraft- Flight Data Recorder and Cockpit Voice Recorder.

While the Flight Data Recorder (FDR) records technical flight data (speed, altitude, engine performance, etc.),  Cockpit Voice Recorder (CVR) records conversations and sounds in the cockpit.

It is used to investigate accidents and understand what happened before a crash.

Despite the name, it is actually bright orange to make it easier to find in wreckage.

Ahmedabad plane crash

On June 12, a London-bound Air India Boeing Dreamliner flight crashed into a medical college hostel soon after takeoff near the Ahmedabad airport killing 275 people including on-ground people.

241 out of 242 onboard passengers and crew members were killed in the crash, which is one of the country's worst aviation tragedies.

One person, the passenger of seat No. 11A,  survived the crash miraculously.