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Reports have emerged that Andreas Lubitz, the Germanwings co-pilot behind the crash of the Airbus 320 plane, practised rapid descent on an earlier flight on the day of the fatal crash.
BBC quoting German newspaper, Bild reports that French investigators said Lubitz tried a controlled descent earlier that day.
According to sources close to the investigation, Lubitz tried a "controlled, minute-long descent for which there was no aeronautical reason" which occurred on the plane's outbound flight from Duesseldorf to Barcelona on the same day as the fatal crash.
French authorities are due to publish an interim report on the investigation later today (Wednesday).
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Andreas Lubitz who is accused of deliberately crashing the Germanwings Flight 4U 9525 was revealed by investigators to have suffered from depression and had rehearsed suicide methods and the security of cockpit doors shortly before the crash.
Flight 4U 9525 had been flying from Barcelona to Duesseldorf and all 150 people on board the flight were killed.