On 11 March 2017, contrary to crew expectations based on their pre-flight takeoff performance calculation, an Airbus 340-300 taking off from the 3,800 metre-long at Bogata only became airborne just before the end of the runway. The Investigation found that the immediate reason for this was the inadequate rate of rotation achieved by the Training Captain performing the takeoff. However, it was also found that the operator’s average A340-300 rotation rate was less than would be achieved using handling recommendations which themselves would not achieve the expected performance produced by the Airbus takeoff performance software that reflected type certification findings.
Description
On 11 March 2017, an Airbus 340-300 (F-GLZU) being operated by Air France on a scheduled international passenger flight from Bogota to Paris CDG as AF423 with an augmented crew and making a night VMC departure only became airborne from the 3,800 metre-long runway 13R just before its end despite using full thrust. The crew estimated being only 4 feet agl as the end of the runway was crossed and obstacles in the initial climb were overflown with little clearance. The remainder of the flight was without further event but on arrival at destination, a detailed safety report was submitted.
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