Kazakhstan Airlines Flight 1907 CVR Recording

𝗞𝗮𝘇𝗮𝗸𝗵𝘀𝘁𝗮𝗻 𝗔𝗶𝗿𝗹𝗶𝗻𝗲𝘀 𝗙𝗹𝗶𝗴𝗵𝘁 𝟭𝟵𝟬𝟳 was an international cargo flight from Shymkent to Delhi, operated by an Ilyushin Il-76 (Reg. UN-76435) on 𝗡𝗼𝘃𝗲𝗺𝗯𝗲𝗿 𝟭𝟮, 𝟭𝟵𝟵𝟲. While descending on Airway G452 the crew contacted Delhi: "Good evening 1907. Passing through 230 for 180, 74 miles from DPN". The controller then cleared the flight to descend to and report at FL150. In the meantime, 𝗦𝗮𝘂𝗱𝗶 𝗔𝗿𝗮𝗯𝗶𝗮𝗻 𝗔𝗶𝗿𝗹𝗶𝗻𝗲𝘀 𝗙𝗹𝗶𝗴𝗵𝘁 𝟳𝟲𝟯, a Boeing 747 (Reg. HZ-AIH), had departed Delhi at 18:32 for a passenger flight to Dhahran. The Delhi controller cleared the flight to climb to FL140. Because Flight 1907 was approaching from the opposite side, the controller told SV763: "Maintain level 140, Standby for higher." A little later, Flight 1907 reported reaching FL150. The controller then responded: "Roger. Maintain 150. Identified traffic 12 o&reciprocal Saudia Boeing 747, 14 miles. Report in sight." The Kazakh crew replied by querying the distance to which the controller answered: "14 miles now, roger 1907." The Kazakh plane then descended below its assigned altitude and was flying at 14,190 feet. Shortly afterwards both planes collided and crashed an arid farming area. 𝗣𝗿𝗼𝗯𝗮𝗯𝗹𝗲 𝗖𝗮𝘂𝘀𝗲: The root and approximate cause of the collision was the unauthorised descending by the Kazak aircraft to FL-140 and failure to maintain the assigned FL-150. The factors contributing to the unauthorised descent of Kazak aircraft to FL-140, departing from the assigned FL-150, were: i) inadequate knowledge of English language...