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Page Title: Section III. OPERATION
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TM  55-4920-400-13 2-11. Pressure Bleed Down Knob. Counterclockwise rotation of pressure down knob  from closed position opens a needle valve (10, fig. 1-1) allow- ing system pressure to bleed off.CLOSE FOR PRES- SURE  UP. 2-12. Pressure Up Knob. Counterclockwise ro- tation of pressure up knob from closed position opens a needle valve allowing pressure in system to increase. 2-13. Vacuum Down Knob. Counterclockwise rotation of vacuum Down knob permits system vacuum to bleed off. CLOSE FOR VACUUM UP. 2-14.  Vacuum  Up  Knob. Counterclockwise rota- tion of vacuum up knob opens a needle valve and pro- vides increased vacuum in system. 2-15. Case Leak Valve Levers. The  case  leak valve levers, located below calibration correction card operates valves which provide for testing aircraft in- struments and checking the master instruments on tester for case leaks and/or calibration. 2-16.  Rate-of-Climb  Indicator. The   rate-of- climb indicator records the rate-of-climb or descent in feet per minute (fpm) according to the vacuum pro- duced by the tester, and is used to test the accuracy of aircraft rate-of-climb indicators. It is graduated from 0 to 6000 fpm for climb on the upper half of the dial and for descent on the lower half of the dial. 2-17.  Altimeter. The tester produces vacuum which simulates altitude conditions and is recorded on the al- timeter in feet. It has a range from 1,000 feet below to Section  III. 2-25. Preparation  for  Use. To prepare the test set for use proceed as follows: a. Set test set on level bench or platform with a source of dc or ac power available. b. Look through window (9, fig. l-l) on right side of test set and observe oil level in reservoir. Oil level must be within points indicated for test set to operate properly. If oil level is low, fill reservoir in accordance with procedure given in paragraph 2-32. 80,000 feet above mean sea level. A barometric scale which is operated by the  correction  knob  is  an  integral part of the altimeter which is used to test the accuracy of  aircraft  altimeters. 2-18.  Airspeed  Indicator.   The   airspeed   indica- tor measures the differential between pitot and static pressures created by the tester in a range between 20 and 250 knots and is used to test the accuracy of air- speed indicators. 2-19.   DELETED 2-20. Fill and Run Selector Valve Lever. The Selector valve lever is in the line between the oil reser- voir and the pump under cover plate (fig. 1-1). The lever has two positions for use as follows: a. RUN, used when testing instruments. b. FILL, used when filling reservoir with oil. 2-21.   DELETED 2-22.  External-Case  Leak  Valve  Knob.  The  ex- ternal case leak valve knob turned to its fullest extent clockwise, closed, and counterclockwise, opens the ex- ternal case leak valve which provides for case leak test- ing of aircraft instruments. 2-23.  Electrical  System.  The relation  of  the  in- struments and controls in the electrical systems to each other is illustrated in figure 2-5. 2-24.  Vacuum  and  Pressure  System. The  in- terrelation of the instruments and controls in the vacuum and pressure systems is illustrated in figure 3-1. OPERATION Do not force-tighten needle valves. c. Set power ON-OFF switch (12, fig. 1-1) to OFF, close four Vacuum and PRESSURE needle valves (10 and  15)  and  set  VACUUM  and  PRESSURE  selector - valves (7 and 16, fig. 1-1) to off. 2 -4 Change   2

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