The actions taken significantly reduce the risk of pitot probe related problems remaining undetected during investigation of airspeed loss or discrepancy events.
Safety issue description
The relevant tasks in the trouble shooting manual did not specifically identify the pitot probe as a potential source of airspeed indication failure.
06 May 2016
Airbus modified the A330/A340 trouble shooting manual (TSM) at the OCT 01/14 Revision to introduce the following improvements:
The maintenance message "ADIRU1 (1FP1) BUS ADR" (class 1 or class 2) is now associated with the cockpit effect "NAV - ADIRS - Red SPD flag shown on CAPT PFD" to trigger the TSM task procedure 34-10-00-810-995-A. The same association has been made for the maintenance message "ADIRU2 (1FP2) BUS ADR" (class 1 or class 2) and the cockpit effect "NAV - ADIRS - Red SPD flag shown on F/O PFD"
The TSM task 34-10-00-810-995-A (Altitude or Airspeed Loss and/or Discrepancy between CAPT PFD - F/O PFD - STDBY/ISIS) now refers to the pitot probes as a possible root cause.
The ATSB notes the changes made by Airbus to the TSM and considers that the issue is adequately addressed.