What was found
SMOKE IN CABIN AND COCKPIT FROM BLEED HEAT SYSTEM. SMOKE WAS BAD ENOUGH TO CAUSE MINOR THROAT IRRITATION, BUT NOT ENOUGH TO USE SMOKE EQUIPMENT. TRIED TWICE, TOOK 3 TO 5 MINUTES FOR SMOKE TO START. VISUALLY INSPECTED BLEED AIR DUCTING TO COCKPIT, RAN ENGINES, PERFORMED BLEED HEAT CHECK, OPS CHECKED NORMAL IAW YS11 MM 71-60.