AAIB has directed Turkish Airlines to strengthen cockpit communication protocols after a serious airprox incident over Mumbai FIR, the report said. Its final findings said a Turkish cargo Airbus A330-200F began an unauthorised climb after misreading a CPDLC message, reducing separation with a Flydubai Boeing 737 MAX 9 to under 1,000 feet in busy oceanic airspace.
Mumbai: The Aircraft Accident Investigation Bureau (AAIB) has ordered Turkish Airlines to rigorously reinforce its cockpit communication protocols following a serious airprox incident over the Mumbai Flight Information Region (FIR). The order is seen as a major safety directive for international carriers operating in Indian airspace.
Near-miss investigation findings
The final investigation report into the near-miss revealed that a Turkish Airlines cargo aircraft initiated an unauthorised altitude climb by misinterpreting an electronic communication message, bringing it within a critical 1,000-feet vertical proximity of a Flydubai passenger jet. The incident involved a Turkish Airlines Cargo Airbus A330-200F, registered as TC-JOO, and a Flydubai Boeing 737 MAX 9, registered as A6-FKR, both operating at adjacent flight levels (FL) in the busy oceanic airspace managed by Mumbai Air Traffic Control (ATC).
According to the AAIB findings, the Turkish Airlines aircraft requested clearance to climb from FL340 (34,000 feet) to FL 360 (36,000 feet) using the Controller Pilot Data Link Communications (CPDLC) – a text-based data link system designed to replace traditional voice radio over oceanic routes. However, a critical misinterpretation of the subsequent digital message occurred. The flight crew erroneously executed the climb instruction without having received formal clearance.
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