What was found
FLIGHT TEST SHORTLY AFTER TAKEOFF AT 1000 FEET COCKPIT & COURIER AREA FILLED WITH MODERATE TO HEAVY SMOKE & FUMES WITH AN ACRID OIL ODOR. IAW NORMAL TEST FLIGHT PROCEDURE APU AIR USED AS BLEED SOURCE FOR AIR CONDITIONING SEVERAL LEVEL 3 ECAM CARGO COMPARTMENTS SMOKE WARNINGS ACTIVATED INCLUDING MID & AFT COMPARTMENTS ECAM & QRH PROCEDURES FOLLOWED WHICH CLOSES MAIN DECK ISO VALVES, BULK CARGO ISOLATION VALVES & NR 2 PACK FLOW VALVES. AFTER 5 MINUTES SMOKE WARNINGS CEASED & SMOKE DISSIPATED. EMERGENCY LANDING EXECUTED. PERFORMED VISUAL CHECK THE AIR PRESSURE OF ALL THE HYD RESERVOIRS IAW AMM 29-14-00-06 2. DEPRESSURIZED ALL THE HYD RESERVOIR SYSTEM IAW AMM 29-14-00-03 . REPLACED THE CHECK VALVE.