advisory, recommendations
Sorry. Too many posts... I have found it at last:
- SB A330-34-3071 (first published in September 2007) proposes to change Thales Avionics pitot probes P/N C16195AA by pitot probes P/N C16195BA.
QUOTE- REASON/DESCRIPTION/OPERATIONAL CONSEQUENCES A320 aircraft family operators have reported airspeed discrepancies while flying under heavy precipitations. A new Pitot probe has been designed to improve A320 aircraft airspeed behavior with these specific weather conditions. A few similar discrepancies had also been reported by A330/A340 aircraft operators and AIRBUS now proposes this Pitot probes improvement for Long Range (LR) aircraft. This Service Bulletin proposes the replacement of the three Pitot probes PN C16195AA (FINs 9DA1, 9DA2 and 9DA3) by new probes PN C16195BA. Accomplishment of this Service Bulletin will improve the resistance against water ingress under severe conditions resulting in improved airspeed behavior. In addition, this new Pitot probe introduces a new external protection layer to prevent corrosion.
UNQUOTE
Please note that both of these SBs are RECOMMENDED only, meaning that it's up to the operators to decide upon the embodiement on their fleets.
To conclude, P/N C16195 has been improved by Thales Avionics to cope with some minor (because no AD was raised to cover those two SBs) in-service issues.
Therefore, the various retrofit campains that have been mentioned in the previous pages are led on a volontary basis by the operators.
No TFU on A330 airspeed discrepancies has been published by Airbus meaning that, even if some incidents have occured (see Air Caraïbes above), it was not on a widespread basis and/or no major safety issue was identified.