TB 1-4920-443-35
24. T53/T63 Oil Flowmeter
a. Performance Check
(1) Ensure that the FEDS is in the T53/T63 mode (Reference FEDS operator's manual).
(2) At the Large Engine Test Trailer, disconnect the cable from the T53/T63 Oil Flowmeter. Connect the
CEC 2700 oscillator pins A+ and B- from J2 connector to pins A and B of the cable connector.
(3) Set the oscillator output to 500 mV p-p. Set the frequency to each set point shown in the table below.
(4) At each set point, record the frequency indications from the calculating counter and AEDATS. Verify
that those indications are within the tolerances specified in the table.
NOTE
To read frequency on a calculating counter channel, enter 4-10000-0 in the thumb switches.
To read frequency with AEDATS 2, refer to the AEDATS (H345-1) Operator's manual, or for
AEDATS IV, refer to the AEDATS IV (H355-7) Operator's manual.
Table 24-1 Oscillator Settings for T53/T63 Oil Flow (Frequency) Alignment
Oscillator Calculating Counter Calculating Counter AEDATS Woil AEDATS Woil
(Hz)
Limits ( 1 Hz)
Reading (Hz)
Limits ( 1 Hz) Reading (Hz)
300
299-301
299-301
600
599-601
599-601
900
899-901
899-901
1300
1299-1301
1299-1301
(5) Enter the calculated "C" factor in the Calculating Counter CH 3 C thumb switches, in the five switch
positions marked "C". Reference paragraph 23 to determine the "C" factor. The specific gravity of the
oil (not fuel) should be used to calculate this "C" factor.
(6) Verify that AEDATS Alignment was done in paragraph 24. Using the flowmeter data obtained in that
paragraph, fill in the columns labeled "Flowmeter Hz" and "Flowmeter PPH" of the table below.
Table 24-2 Oscillator Settings for T53/T63 Oil Flow (lb/hr) Alignment
Target
Flowmeter
Flowmeter
Calculating Counter
Calc.
AEDATS WFoil PPH
AEDATS
Freq.
Hz
PPH
Limits
Counter
Limits
WFOil
(Hz)
from table
from table 21-
(calculated as
Reading
(calculated as
Reading
1
follows)
follows)
Flowmeter PPH 0.5%
Flowmeter PPH
0.35%
300
600
900
1300
Note: Calculating Counter Reading = Oscillator Frequency x C, where C is calculated in paragraph 21.
(7) Set the oscillator output to 500 mV p-p. Set the frequency to each of the set points in the "Flowmeter
Hz" column of the table above. Record the flow indications from the calculating counter and AEDATS
and verify that those indications are within the specified tolerances.
(8) Reconnect the oil flowmeter cable.
(9) The turbine flowmeter should be calibrated by a qualified laboratory every twelve (12) months.
25. T63 Fuel Flowmeter
a. Performance Check
(1) Ensure that the FEDS is in the T63 mode with the T63 Flight Harness (20090777-1) connected to the
J-box (Reference FEDS operator's manual).
(2) The T63 Fuel Flowmeter produces a non-linear frequency vs. mass-flow (PPH or lb/hr) relationship. A
flow linearizer (P/N LN-5-C-V1B6) mounted on the Fuel Skid linearizes this signal.
b. Fuel Flow T63 Flow Linearizer Programming
(1) Must load program on Laptop called "Link Host"
