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July 6th, 2009


Following the many questions which have appeared in the media on the issue of the Pitot probes in its fleet (the Pitot probe is one of the instruments which calculates the air speed of the aircraft), Air France wishes to make the following clarifications:
1)   Malfunctions in the Pitot probes on the A 320 led the manufacturer to issue a recommendation in September 2007 to change the probes. This recommendation also applies to long-haul aircraft using the same probes and on which a very few incidents of a similar nature had occurred.
It should be noted that a recommendation from the manufacturer gives the operator total freedom to apply the corresponding guidelines fully, partially or not at all. Should flight safety be concerned, the manufacturer, together with the authorities, issues a mandatory service bulletin followed by an airworthiness directive (AD).
The recommendation to change the probes was implemented by Air France on its A320 fleet where this type of incident involving water ingress at low altitude had been observed. It was not implemented on the A340/330s as no such incidents had been noted.
2)   Starting in May 2008 Air France experienced incidents involving a loss of airspeed data in flight, in cruise phase on A340s and A330s. These incidents were analysed with Airbus as resulting from pitot probe icing for a few minutes, after which the phenomenon disappeared. Discussions subsequently took place with the manufacturer.  Air France asked for a solution which would reduce or eliminate the occurrence of these incidents. In response to these requests, the manufacturer indicated that the probe model recommended for the A320 was not designed to prevent such incidents which took place at high-altitude cruise levels, and reiterated the operational procedures well-known to the crews.
In the first quarter of 2009 laboratory tests suggested, however, that the new probe could represent a valuable improvement to reduce the incidence of high altitude airspeed discrepancy resulting from pitot probe icing, and an in service evaluation in real flight conditions was proposed by Airbus. Without waiting for the in service evaluation, Air France decided to replace all its probes and the programme was launched on 27 April 2009.
Without making any assumptions as to a possible link with the causes of the accident, Air France speeded up this programme and reminded its pilots of the current instructions issued by the manufacturer to cope with the potential loss of airspeed data.
Português
Devido às dúvidas na imprensa em relação às sondas “Pitot” (sonda “Pitot” é o instrumento que permite medir a velocidade aerodinâmica da aeronave) a Air France esclarece:
1)   Os defeitos de funcionamento das sondas Pitot do A320 levaram o fabricante a editar em setembro de 2007 uma recomendação de troca das sondas. Esta recomendação também se aplica aos aviões de longo-curso que utilizam as mesmas sondas e sobre os quais foi observado um número irrelevante de incidentes do mesmo tipo.
Vale lembrar que uma recomendação do fabricante dá ao operador a liberdade de aplicar a troca totalmente, parcialmente ou não trocar. Por outro lado, quando envolve a segurança, o fabricante, em conjunto com as autoridades, emite um boletim obrigatório (mandatory service bulletin) reforçado por uma “instrução de navegabilidade” (Airworthiness directive).
A recomendação de trocar as sondas é aplicada pela Air France nos A320 onde tais incidentes por ingestão de água a baixa altitude foram observados. Ela não foi aplicada nos A340/330 por não terem sido constatados tais incidentes.
2)   A partir de maio de 2008, a Air France observa incidentes de perda de informações anemométricas em voo em velocidade de cruzeiro nos A340 e A330. Estes eventos são analisados com a Airbus, como decorrentes de fluxo de gelo nas sondas, com a pane desaparecendo em alguns minutos. Discussões com o fabricante foram então estabelecidas, por ocasião de reuniões técnicas. A Air France pede uma solução para reduzir ou eliminar a aparição destes incidentes. Em resposta, o fabricante indica que o modelo recomendado para o A320 não foi concebido para prevenir os incidentes ocorridos em velocidade de cruzeiro em alta altitude e relembra às tripulações os procedimentos operacionais já bastante conhecidos.
No primeiro trimestre de 2009, os testes em laboratório mostraram que a nova sonda poderia trazer uma melhoria significativa ao problema de gelo em altas altitudes em relação à sonda anterior. Para confirmação final, a Airbus propõe uma experimentação em vôo, em situação real. Sem aguardar esta experimentação, a Air France decide trocar todas as sondas de sua frota A330/340 e este programa de troca é lançado em 27 de abril de 2009.Sem pressupor uma ligação com as causas do acidente, a Air France acelerou este programa de troca e relembrou as instruções em vigor emitidas pelo fabricante para fazer face à perda potencial das informações anemométricas.

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