What was found
THE HYDRAULIC RESERVOIR PRESSURE REGULATOR DIAPHRAGM BREAKS ALLOWING RUBBER PIECES TO BLOCK OPEN, THE CHECK VALVE TO THE PNEUMATIC SYSTEM. THIS, IN TURN, ALLOWS HYDRAULIC FLUID INTO THE BLEED AIR SYSTEM, WHICH CONTAMINATES IT, AND THEN THE ENSUING SMOKE GETS INTO THE CABIN. SUBMITTER STATED THE REGULATOR DIAPHRAGM NEEDS TO BE MADE OF A STURDIER MATERIAL, MORE HEAT RESISTANT. (X)