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Page Title: 2-26. Operating Procedure.
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TM 55-4920-400-13 CAUTION Power source voltage must be within limits specified in paragraph 1-5. d. If  ac  power  is  used,  connect  ac  power  cable (item 1, table 1-1) to power connector on rear panel. Connect either single-phase adapter cable (item 3) or 3-phase adapter cable (item 4) to free end of ac power cable, then connect free end of adapter cable to appropriate ac power source. e. If  dc  power  is  used,  connect  dc  power  cable (item 2) to POWER connector on rear panel and, ob- serving polarity, connect clips of dc power cable to dc power source. 2-26.  Operating  Procedure.  To  operate  the  test set, proceed as follows: a. Raise hinged panel at top of test set and set all selector  valves  on  recessed  valve  panel  to  CLOSED. b. Determine which aircraft instrument is to be tested, then perform either paragraph c or d below. CAUTION    Vacuum valves must be open when operating pressure side; pressure valves must be closed when operating vacuum side. c. If pressure is to be used, open Vacuum Up and Down needle valves (15). d. If vacuum is to be used, open Pressure up and Down  needle  valves  (10).  Set  Vacuum  or  Pressure selector valve (7 or 16), as applicable to setting cor- responding to that of instrument to be tested. Make sure  that  UP  and  DOWN  needle  valves  associated with the chosen selector valve are closed. e. Using  appropriate  accessories  (see  table  1-1), connect  instrument  to  be  tested  to  FUEL  PRESS., MANF. PRESS., AIRSPEED, or RATE OF CLIMB ALTIMETER  fitting  on  rear  panel  as  applicable. The RATE OF CLIMB ALTIMETER fitting is used for testing both rate-of-climb indicator and altime- ter. f. On  recessed  valve  panel  beneath  calibration chart (3) at top of test set, set selector valve which corresponds to the instrument connected in step 4 to OPEN.    g.  Set power ON/OFF switch (12) to ON: power on indicator (11) will light and pump will start. h. Open “UP” needle valve associated with selec. tor valve chosen in step 3. Use very slight turn of in- strument. Continue opening Up needle valve to ob- tain maximum deflection of both instrument on test set panel and instrument under test. i. To  return  to  zero  deflection,  close  up  needle valve  and  slowly  open  DOWN  needle  valve.  Con- tinuing opening DOWN needle valve until zero de- flection is obtained. j. To  obtain  true  indications,  operate  UP  and DOWN needle valves until indication of applicable instrument   on   test   set   instrument   panel   cor- responds  to  the  corrected  reading  shown  on  cor- rection card at top of test set. Refer to table 2-1 for test  data  pertaining  to  aircraft  instruments  which can be checked using the test set. k. At  conclusion  of  test,  open  applicable  DOWN needle valve, until all instruments indicate zero (0), 2-27.   Shutdown   Procedure.   To   disconnect   in- strument under test and shut down test set, proceed as follows: Do not turn selector valves, or discon- nect hoses from test set unless all in- struments  indicate  zero. a. Set power (12, fig. 1-1) switch to OFF. b. Raise  hinged  panel  (3)  at  top  of  test  set  and set  all  selector  valves  on  recessed  valve  panel  to CLOSED. c. Disconnect instrument under test from fitting on rear panel of test. d.  Set  VACUUM  AND  PRESSURE  selector valves (7 and 16) to OFF and close four VACUUM and PRESSURE needle valves (10-15). e. Disconnect  test  set  from  power  source. 2-5

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