The co-pilot, who was supposed to hold fort in the cockpit, claims she was busy on her tablet and did not notice that the aircraft had lost altitude. It took a call from an alarmed Ankara ATC, asking why 9W-228 had moved away from its assigned flight level of 34,000 feet, for the situation to be rectified.
European ATCs in particular have become very particular about watching aircraft sticking to their flight path in this extra-sensitive region. Other aircraft had been assigned the flight level at which Jet's B-777-300 had descended to.
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