This is press release #12 from the Air France website. It's more reliable than 'merkin media but will still have been through le spin docteurs so again is à prendre avec une pincée de sel.
If I'm reading it right ...
- Airbus issued a recommendation to update the probes on A320s to help with pitot icing issues
- AF requested help from Airbus with pitot icing issues on A330s and A340s
- Airbus were initially unable to offer a solution but then thought the new A320 probes might help there too and requested some test
- AF began replacing the probes on the A330/A340 fleet without waiting for the test results
- The plane that went down had not yet been modified
FWIW Dave at FL390 is tending towards the plane simply being swatted out of the sky by a thunderstorm. In a reply to a comment that has really stuck in my mind he said "There are several high altitude break-ups of jet airliners. In contemporary times, they are rare because we have better radar, ATC help, and overall training. Aviation knowledge is built on dead men's bones."
QUOTE
Press release N° 12
Update on anemometric sensors
Following the many questions which have appeared in the media on the issue of the Pitot probes in its fleet (the Pitot probe is an instrument which measures 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 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 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 loss of airspeed data.[/quote]
Posted: Mon Jun 01, 2009 10:42 pm
Lets hope the passengers are safe somewhere. 