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Air France 447

Printed page 22. PDF page 24.

briefly twice in a row. The recorded parameters showed a sharp fall from about 275 kt to 60 kt in the speed displayed on the left primary flight display (PFD), then a few moments later in the speed displayed on
Open official document at PDF page 24Final Report: Accident on 1st June 2009 to the Airbus A330-203 registered F-GZCP operated by Air France flight AF 447

Air France 447

Printed page 44. PDF page 46.

flight conditions at that time. If the CAS measurements for the three ADR are lower than 60 kt, the angle of attack values of the three ADR are invalid and the stall warning is then inoperative. This results from a
Open official document at PDF page 46Final Report: Accident on 1st June 2009 to the Airbus A330-203 registered F-GZCP operated by Air France flight AF 447

Air France 447

Printed page 190. PDF page 192.

this is the drop in the measured airspeeds, some of which fell temporarily to below 60 kt, while the angle of attack reached 40°. Furthermore, the drop in measured airspeeds to values of less than 60 kt during the stall
Open official document at PDF page 192Final Report: Accident on 1st June 2009 to the Airbus A330-203 registered F-GZCP operated by Air France flight AF 447

Air France 447

Printed page 198. PDF page 200.

invalid, the warning stops. By design, when the measured speed values are lower than 60 kt, the measured angle of attack values are invalidated. Each time that the stall warning triggered, the angle of attack exceeded
Open official document at PDF page 200Final Report: Accident on 1st June 2009 to the Airbus A330-203 registered F-GZCP operated by Air France flight AF 447

Air France 447

Printed page 212. PDF page 214.

When airspeeds are below 60 kt, the stall warning is no longer available, even though it may be beneficial for it to be available at all times. Consequently, the BEA recommends that: EASA require a review o
Open official document at PDF page 214Final Report: Accident on 1st June 2009 to the Airbus A330-203 registered F-GZCP operated by Air France flight AF 447

Air France 447

Printed page 8. PDF page 8.

jusqu'à 16° à cabrer. A 2 h 14 min 19, la CAS n'est plus NCD. Elle passe de 30 kt à 60 kt puis diminue jusqu'à 32 kt. A 2 h 14 min 21, l'incidence 2 n'est plus
Open official document at PDF page 8AF447 Final Report, Appendix 2: Chronologie FDR