TB 1-4920-443-35
22. T700 FUEL FLOW METER
a. Performance Check
(1) Ensure that the FEDS is in the T700 mode (Reference FEDS operator's manual).
(2) Set AEDATS to Engine run screen.
(3) At the Fuel Trailer, disconnect the cable from the T700 flowmeter, MT206. Connect the CEC2700
oscillator pins A+ and B- from J2 connector to A (+) and B (-) of the cable connector.
below.
(5) 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 22-1 Oscillator Settings for T700 Fuel Flow (Frequency) Alignment
Oscillator Calculating Counter Calculating Counter AEDATS WF
AEDATS WF
(Hz)
Limits ( 1 Hz)
Reading (Hz)
Limits ( 1 Hz) Reading (Hz)
240
239-241
239-241
480
479-481
479-481
720
719-721
719-721
960
959-961
959-961
1200
1199-1201
1199-1201
(6) Enter the calculated "C" factor in the Calculating Counter CH 4 C thumb switches, in the five switch
positions marked "C". Reference paragraph 21 to determine "C" factor.
(7) 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 22-2 Oscillator Settings for T700 Fuel Flow (lb/hr) Alignment
Target Flowmeter Hz
Flowmeter
Calculating Cntr.
Calc.
AEDATS WFi PPH
AEDATS
Freq. from table 21-
PPH
Limits
Counter
Limits
WFi
(Hz)
1
from table 21-
(calculated as
Reading
(calculated as
Reading
1
follows)
follows)
Flowmeter PPH
Flowmeter PPH
0.5%
0.35%
240
480
720
960
1200
Note: Calculating Counter Reading = Oscillator Frequency x C, where C is calculated in paragraph 21.
(8) Connect the thermocouple calibrator to the fuel temperature thermocouple connector (TC208). Set
the output for Type J output at a temperature that corresponds to calibration temperature from the
flowmeter calibration sheet.
(9) 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 fuel flow indications from the calculating counter and
AEDATS and verify that those indications are within the specified tolerances.
(10)Reconnect the fuel flowmeter cable and fuel thermocouple.
(11)The turbine flowmeter should be calibrated by a qualified laboratory every twelve (12) months.
a. Performance Check
(1) Ensure that the FEDS is in the T53/T55 or T64 mode (Reference FEDS operator's manual).
(2) At the Fuel Trailer, disconnect the cable from the T53/T55/T64 Fuel Flowmeter, MT207. Connect the
