NEW DELHI, June 17, (AP): Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead. The black boxes will provide cockpit conversations and data related to the plane's engine and control settings to investigators and help them in determining the cause of the crash.

The London-bound Air India aircraft, a Boeing 787 Dreamliner, crashed on a medical college hostel soon after taking off from the western city of Ahmedabad. Only one passenger survived the crash, while 241 people on board and 29 on the ground were killed in one of India’s worst aviation disaster in decades. Experts from India’s Aircraft Accident Investigation Bureau are probing the crash with assistance from the UK, the US and officials from Boeing.

Amit Singh, a former pilot and an aviation expert, said the recovery of the flight data and cockpit voice recorders, or black boxes, are crucial to piece together the sequence of events. The cockpit voice recorder records pilots’ conversation, emergency alarms and any distress signal made before a crash. The plane’s digital flight data recorder stores information related to engine and control settings.

Both devices are designed to survive a crash. "The data will reveal everything,” Singh said, adding that the technical details could be corroborated by the cockpit voice recorder that would help investigators know of any communication between air traffic control and the pilots. India’s aviation regulatory body has said the aircraft made a mayday call before the crash.

Singh said the investigating authorities will scan CCTV footage of the nearby area and speak with witnesses to get to the root cause of the crash. Additionally, Singh said, the investigators will also study the pilot training records, total load of the aircraft, thrust issues related to the plane's engine, as well as its worthiness in terms of past performances and any previously reported issues.

Aurobindo Handa, former director general of India’s Aircraft Accident Investigation Bureau, said the investigators across the world follow a standard UN-prescribed Manual of Accident Investigation, also called "DOC 9756,” which outlines detailed procedures to arrive at the most probable cause of a crash. Handa said the investigation into last week's crash would likely be a long process as the aircraft was badly charred.