What was found
INSTRUMENT VACUUM SYSTEM HAD INSUFFICIENT SUCTION. ADJUSTING THE VACUUM REGULATOR HAD NO EFFECT. LOOKING THROUGH THE VACUUM EJECTOR OUTLET REVEALED A FOREIGN OBJECT RESTRICTING THE VENTURI. AN 8-32 NUT WAS RETRIEVED FROM THE VENTURI. THIS NUT CAME FROM INSIDE THE BLEED AIR RELIEF VALVE, PN RV05-268, WHICH IS MOUNTED ADJACENT TO THE INLET SIDE OF THE VENTURI. THIS NUT IS USED AS A JAM NUT TO SECURE THE RELIEF VALVE PRESSURE SETTING. SUGGEST THIS NUT COULD BE SECURED WITH LOCKTITE OR OTHER THREAD LOCKER. (K)