Russia has found the main flight recorder from a military plane that crashed into the Black Sea killing all 92 on board, the Defence Ministry said on Tuesday, amid unconfirmed reports that authorities had grounded all aircraft of the same type.

The recorder, one of several reported to be on board, contains information that could help investigators identify the cause of Sunday’s crash, which killed dozens of Red Army Choir singers and dancers en route to Syria to entertain Russian troops in the run-up to the New Year.

Investigators have so far said that pilot error or a technical fault, rather than terrorism, are most likely to have caused the Defence Ministry’s Tupolev-154 to crash into the sea.

The black box, which was found by a remote-controlled underwater vehicle at a depth of around 55ft (17 metres) and 1 mile (1,600 metres) from the resort of Sochi, has been sent to a Defence Ministry facility in Moscow for analysis.

“The casing holding the flight recorder is in a satisfactory condition,” the ministry said in a statement.

SOURCE REUTERS, Read more..