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:
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
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
(2) Obtain a sample of fuel from the fuel tank
(3) Measure and record the temperature of the: fuel
(4) Measure and record the specific gravity of the
(5) Depress switch No. 8 on the data selector
assembly (7, figure 1-22). Note and record the
temperature displayed on the temperature digital
(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
measured fuel sp gr - 0.7570
70F (step 5)
If the measured fuel temperature is
obtained from the measured specific
calibration fluid temperature add the
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
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
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.