TM 55-4920-328-13 o.  Verify that the correct engine performance panel is installed   on   the   vertical   tape   indicator   assembly   (9, figure  1-22).    When  testing  T73  or  T74  engines,  place the right hand slide switch of the vertical tape indicator in  the  center  position;  engine  performance  panels  are not included in kits used to test these engines. p.  Verify that all engine accessory connections have been correctly made. q.    Prior  to  firing  the  engine,  determine  the  fuel  K factor  to  be  pre-set  into  the  fuel  flow  monitor  unit  (16, figure 1-23), using the following procedure s: NOTE The following procedures are applicable only for calculation of the K  factor  presets  through  the  linear flowmeter   range   between   200   and 5,930 pph for JP-4 or JP-5 fuel. (1)        Record    the    following    data    shown    on    the calibration    sheet    provided    with    the    test    trailer    fuel system flowmeter (5, figure 1-10): (a)  Pulses per second (pps) (b)  Cycles per second (cps) (c)  Calibration fluid specific gravity (d)  Calibration fluid temperature NOTE The   presence   of   water   in   fuel   will affect   the   specific   gravity   reading obtained    in    the    following    steps. Ensure that the fuel sample obtained is free from water to avoid error in K factor calculation. (2)      Obtain   a   sample   of   fuel   from   the   fuel   tank assembly (1). (3)  Measure and record the temperature of the: fuel sample. (4)    Measure  and  record  the  specific  gravity  of  the fuel sample. (5)      Depress   switch   No.   8   on   the   data   selector assembly    (7,    figure    1-22).        Note    and    record    the temperature     displayed     on     the     temperature     digital indicator (1). (6)      Calculate   the   corrected   fuel   specific   gravity using   the   data   obtained   in   the   preceding   steps   in accordance with the following formula: corrected sp gr = measured sp gr +0.0004 x D/F As an example: measure fuel temperature = 50 °F (step 3) measured    fuel    sp    gr    -    0.7570 (step 4) digital readout temperature = 70F (step 5) NOTE If  the  measured  fuel  temperature  is lower than the calibration fluid temperature, subtract the value obtained from the measured specific gravity. If the measured fuel temperature is higher than the calibration  fluid  temperature  add  the value to the measured specific gravity. 70F - 50F = 20F ( D F) (20 x 0.0004 - 0.0080) Therefore: 0.7570 - 0.0080 = 0.7490 (corrected sp gr) (7)    Prior  to  starting  the  engine,  it  Is  necessary  to determine the correct fuel flowmeter K factor to be pre- set  into  the  digital  fuel  flow  monitor  unit  (16,  figure  1- 23).  Test stand operators are required to calculate the K factor   so   that   the   readout   will   be   in   accurate   Ib/hr, corrected for temperature.  The calculation requires two items of data: (a)  Flowmeter calibration data. (b)  User determination of test fuel specific gravity and temperature. NOTE The turbine flowmeters used with the METS  require  periodic  calibration  at intervals  not  to  exceed  one  (1)  year. The    request    for    calibration    should include all information required by the user for correct K factor calculations. As    a    minimum    the    request    shall include: 1  The flowmeter must be calibrated using either JP-4 or MIL-F-7024A type II fluids. 2  A column indicating Ib/hr flow rate. 3  A column indicating cycles for sec. 3-8