What was found
DURING T/O, EXPERIENCED TOTAL LOSS OF PRESSURE IN LT HYD SYS & A LOSS (5 PSI REMAINING) OF RT HYD SYSTEM. FLT CREW REPORTED NO HYD PRESSURE WHEN SELECTING GEAR UP. SELECTED GEAR HANDLE DOWN & STARTED WITH EMERGENCY CHECK LISTS. RETURNED TO ARLANDA (STOCKHOLM) & MADE A FLAP 11 LANDING. STOPPED AT RUNWAY END, UNABLE TO TURN OFF. MX REVEALED DRAIN PORT HOUSING, P/N 4102202-1, INSTALLED PTU, P/N 4100310-6, S/N 315C, HAD CRACKED COMPLETELY AROUND CIRCUMFERENCE. PTU REPORTED TO HAVE 42,254 BUT THE TIME ON THE FAILED DRAIN PORT HOUSING, SINCE INSTALLATION IAW SB 4100310-29-0031 (AD 94-22-03) WAS NOT REPORTED. FRISBY AEROSPACE HAS REQUESTED THIS FAILED DRAIN PORT HOUSING BE RETURNED FOR FAILURE INVESTIGATION.