What was found
(CAN) THE MFS PCU GT411-6001-9 CYLINDER, PN 376340-7, BASE RADIUS WAS FOUND OUT OF SPEC, OVERSIZED RELIEF IN THE BOTTOM OF THE CYLINDER BORE, CAUSING PISTON SEAL DAMAGE. THIS DEFECT CREATES A HYD FLUID BYPASS CONDITION THAT COULD RESULT IN A REDUCTION IN HINGE MOMENT CAPABILITY & SEVERE INTERNAL LEAKAGE DURING VARIOUS FLIGHT PHASE. QTY 183 MFS PCU SUSPECT. THIS CONDITION IS UNDER INVESTIGATION. TRIAGE IS IN WORK TO ASSESS THE CRITICALITY OF THE FAILURE.