What was found
AIRCRAFT LOST HYDRAULIC PRESSURE IN-FLIGHT DUE TO LOSS OF FLUID. FLUID LEAK CAUSED BY CIRCUMFERENTIAL SCORING ON AN824-4-D TEE WHERE IT CONTACTS FLARE ON END OF PN 723088-307 UPLOCK TUBE ASSY, BY GEAR SELECTOR VALVE. (REF. I.P.C. 29-10-00, FIG. 2, ITEMS 16 AND 79.) CAUSE UNKNOWN. INSTALLED NEW TEE.