The crew took off at 05:40 from Paris Le Bourget airport (in the Seine-Saint-Denis department) for a positioning flight to Lannion airport (in the Côtes-d'Armor department). At 05:47, in contact with the departure sector of the Paris Area Control Centre (Paris ACC), they were cleared to climb to FL 240 towards KOKOS. The copilot was the PF and flying was carried out in manual mode. From 05:47:37, the oil pressure in the left engine started to fluctuate. The examination carried out by the manufacturer found that the No. 2 intermediate bearing of the left engine (engine 1) had failed. The meteorological conditions at Paris Orly were CAVOK.
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