37 VACUUM
TTP B1-L3 ATA 37 Beech 90 Series B2-L2 Vacuum V acuum system has a filter, vacuum gage, vacuum instruments, regulator valve, vacuum manifold, low vacuum annunciator switches, engine-driven vacuum pumps and related plumbing. DESCRIPTION AND OPERATION The vacuum system furnishes vacuum to operate the surface deice system, the instruments, the air-operated turn and slip indicator (if installed),the vacuum (gyro suction) gauge, and the cabin pressurization control system. To produce the vacuum, pneumatic air is passed through the ejector venturi. This draws air from the vacuum system regulator valve, the instrument air filter,the cabin p...