EASA on 21 September issued an emergency airworthiness directive (AD) for Airbus A330/A340 aircraft fitted with certain Goodrich pitot tubes after receiving several reports of loose pneumatic quick disconnect unions on the tubes.
The AD applies to Goodrich pitot tubes featuring the part number (P/N) 0851HL with serial numbers 267328 through 270714.
EASA explains the disconnect could be the result of mis-torque of the affected unions at the equipment manufacturing level, but investigations are still ongoing to determine the root cause.
"This condition, if not corrected, could lead to an air leak resulting in incorrect total pressure measurement and consequent erroneous calibrated airspeed/MACH parameters delivered by the Air Data Computer," EASA explains.
EASA is ordering operators with the affected pitot tubes to perform a torque check of the pneumatic quick-disconnect union of the tube, and depending on the findings, apply the appropriate corrective actions before the next flight. Airbus has supplied corrective actions in communications sent to all operators.
Within 10 days of the emergency AD's issuance operators have to report findings of the torque checks, including no findings, to Airbus.