Final Report A320 (VT-IAY) & A320 (VT-HYD), en-route east of Nashik India, 21 March 2022

Final Report A320 (VT-IAY) & A320 (VT-HYD), en-route east of Nashik India, 21 March 2022

Publication info
Author
AAIB India
Category
Accident Reports Air Ground Communication Loss of Separation Level Bust Human Factors
Date of publication
09/05/2023
Date for review
01/01/2050

On 21 March 2022, an Airbus A320 level at FL 360 lost separation with another Airbus A320 which continued its descent beyond its cleared level. A predictive conflict alert prompted the controller to issue multiple calls confirming the clearance limit but with no response so when both aircraft tracks crossed at FL 360, lateral separation was reduced to 3.8 nm. It was concluded that the immediate cause of the conflict was the failure of the descending aircraft to respond to ATC alerting calls but that its origin was an undetected incorrect readback of the descent clearance.

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