Type/Model designation(s) : A330 and A340 aeroplanes Several reports have recently been received of loose pneumatic quickdisconnect unions on Goodrich pitot probes P/N 0851HL. These may be the result of mis-torque of the affected unions at equipment manufacturing level. Investigations are still on-going to determine the root cause(s). This condition, if not corrected, could lead to an air leak, resulting in incorrect total pressure measurement and consequent erroneous Calibrated Airspeed (CAS)/MACH parameters delivered by the Air Data Computer (ADC). As a precautionary measure, this AD requires a torque check of the pneumatic quick-disconnect union on certain Goodrich P/N 0851HL pitot probes and corrective action, depending on findings.