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| Russia Saratov crash: Ice on sensors 'may be cause' | Russia Saratov crash: Ice on sensors 'may be cause' |
| (about 17 hours later) | |
| Speed sensors that were iced over may have caused a passenger jet to crash near Moscow, killing all 71 people on board, investigators say. | Speed sensors that were iced over may have caused a passenger jet to crash near Moscow, killing all 71 people on board, investigators say. |
| The faulty instruments could have given the pilots wrong speed data, Russia's Interstate Aviation Committee said. | The faulty instruments could have given the pilots wrong speed data, Russia's Interstate Aviation Committee said. |
| The Saratov Airlines jet went down minutes after take-off from Moscow's Domodedovo airport on Sunday. | The Saratov Airlines jet went down minutes after take-off from Moscow's Domodedovo airport on Sunday. |
| More than 1,400 body parts and hundreds of plane fragments have been recovered from the crash site. | More than 1,400 body parts and hundreds of plane fragments have been recovered from the crash site. |
| What are the investigators saying? | What are the investigators saying? |
| A preliminary analysis of the on-board flight recorder indicated the plane had problems two-and-a-half minutes after it took off, at an altitude of around 1,300m (4,265ft). | A preliminary analysis of the on-board flight recorder indicated the plane had problems two-and-a-half minutes after it took off, at an altitude of around 1,300m (4,265ft). |
| The instruments began displaying different speed readings, probably because of iced speed sensors while their heating systems were shut off, the committee said. | The instruments began displaying different speed readings, probably because of iced speed sensors while their heating systems were shut off, the committee said. |
| When the crew detected the issue, they switched off the plane's autopilot. They eventually took the plane into a dive at 30-35 degrees. | When the crew detected the issue, they switched off the plane's autopilot. They eventually took the plane into a dive at 30-35 degrees. |
| Russian media reports said the plane's captain had rejected a de-icing treatment on the plane before take-off. The procedure is optional and the crew's decision is based mainly on the weather conditions. | |
| Iced-over speed sensors, known as Pitots, were cited as the likely reason for a 2009 Air France plane crash, which killed 228 people. | Iced-over speed sensors, known as Pitots, were cited as the likely reason for a 2009 Air France plane crash, which killed 228 people. |
| What about the search operation? | What about the search operation? |
| More than 700 people are involved in the search operation, struggling through deep snow. | More than 700 people are involved in the search operation, struggling through deep snow. |
| The emergencies ministry is collecting DNA samples from victims' relatives as part of the identification process of the 65 passengers, including a child and two teenagers, and six crew. | The emergencies ministry is collecting DNA samples from victims' relatives as part of the identification process of the 65 passengers, including a child and two teenagers, and six crew. |
| Wreckage and body parts are strewn over a large area - about 30 hectares (74 acres) - near the village of Argunovo, about 80km (50 miles) south-east of Moscow. | Wreckage and body parts are strewn over a large area - about 30 hectares (74 acres) - near the village of Argunovo, about 80km (50 miles) south-east of Moscow. |
| What else do we know? | What else do we know? |
| The Antonov An-148 was en route to Orsk in the Ural mountains and lost contact at 14:27 (11:27 GMT), without sending any emergency call. | The Antonov An-148 was en route to Orsk in the Ural mountains and lost contact at 14:27 (11:27 GMT), without sending any emergency call. |
| Russia's Investigative Committee said the plane was intact when it crashed and that an explosion happened on impact. | Russia's Investigative Committee said the plane was intact when it crashed and that an explosion happened on impact. |
| Flight-tracking site Flightradar24 said it descended at the rate of 1,000m (3,300ft) per minute. | Flight-tracking site Flightradar24 said it descended at the rate of 1,000m (3,300ft) per minute. |
| The jet, which was reportedly seven years old, was being flown by an experienced pilot who had 5,000 hours of flying time. | The jet, which was reportedly seven years old, was being flown by an experienced pilot who had 5,000 hours of flying time. |
| A criminal inquiry has been launched. | A criminal inquiry has been launched. |
| What do we know about Saratov Airlines? | What do we know about Saratov Airlines? |
| In 2015 the regional airline was banned from operating international flights, after inspectors found someone other than the flight crew in a cockpit. | In 2015 the regional airline was banned from operating international flights, after inspectors found someone other than the flight crew in a cockpit. |
| The airline appealed and changed its policy before resuming international charter flights in 2016. | The airline appealed and changed its policy before resuming international charter flights in 2016. |
| Antonov aircraft were first developed in Ukraine, but are also made in Russia. The twin-engine model involved in Sunday's crash had its first flight in 2004. | Antonov aircraft were first developed in Ukraine, but are also made in Russia. The twin-engine model involved in Sunday's crash had its first flight in 2004. |
| In 2011, one broke up mid-flight during a training flight in the Belgorod region in southern Russia, killing all six crew members on board. | In 2011, one broke up mid-flight during a training flight in the Belgorod region in southern Russia, killing all six crew members on board. |
| Recent Russian air disasters | Recent Russian air disasters |
| The country has suffered two major plane crashes since 2015: | The country has suffered two major plane crashes since 2015: |