What was found
BURNING RUBBER SMELL ON FLIGHT DECK WHEN HYD SYS ARE TURNED ON. SMOKE FUMES WERE ALSO PRESENT. PERFORMED A GVI FOR ANY LEAKS OUTSIDE OF AIRCRAFT. NONE NOTED. PERFORMED AN OPERATIONAL TEST OF THE AIR CONDITIONING DISTRIBUTION SYSTEM IAW AMM 21-51-00-710-801. NO SMELLS NOED. RAN ALL 3 HYDRAULIC SYSTEMS. NO SMELLS NOTED. GROUND RAN BOTH ENGINES AT IDLE IAW AMM 71-00-00. NO DEFECTS NOTED C/W TASK SMOKE & ABNORMAL SMELL IAW FIM 21-21-00. NONE NOTED