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Page Title: Section III. Principles Of Operation
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TM 1-4920-458-13&P Section III.  Principles Of Operation 1-10. PRINCIPLES OF OPERATION A small high-speed pump serves dual functions by producing system vacuums up to 29 inches of mercury and system pressures  up  to  6.5  psi  to  simulate  aircraft  atmospheric  and  airspeed  conditions.    These  vacuums  and  pressures  are delivered  to  the  respective  aircraft  system  and  tester  instruments  through  oil  reservoir,  oil  sumps,  and  a  network  of hoses,  rigid  pressure  lines,  fittings,  adapters,  valves  and  ports  on  the  tester  along  with  external  hoses  and  adapters supplied with the tester. The pump serves the dual function of developing pressure as well as vacuum for operation of the Tester.  In the pressure section, a mixture of air and oil is pumped into the reservoir where the oil and air are separated.  The separated oil drops to the bottom of the reservoir where it is bled to the pump for lubrication purposes, the air being forced out at the top of the reservoir under pressure.  The pressurized air, after going through the check valve whose function is to prevent oil from entering instrument lines during operation, enters an oil sump and passes through a filter which is an integral part of the sump.  Air from the sump blows through two pressure control valves.  The pressure INCREASE valve controls the amount  of  air  permitted  in  the  system  and  the  pressure  DECREASE  valve  opens  the  line  to  the  ambient  air,  allowing system pressure to bleed off.  The available pressure level, as fixed by the control valves is sent to the pressure relief valve and PRESSURE selector valve.  Setting the PRESSURE selector valve at the desired test position completes the circuit to the instrument under test and the master instrument to one of the pressure relief valves.  The pressure relief valve is in the line at all times and protects the instruments from pressure overload when the pump is producing vacuum which passes through the check valve, and the sump which prevents oil from entering the instrument lines.  The vacuum INCREASE valve controls the amount of vacuum in the system and the vacuum DECREASE valve opens the line to the ambient air allowing the system vacuum to bleed off. 1-8

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