TB 1-4920-443-35
(AEDATS).
(5) Disconnect the test equipment and install the cover on the Flow Linearizer.
(6) The turbine flowmeter should be calibrated by a qualified laboratory every twelve (12) months.
26. Specific Gravity Indicator (0.680 to 0.850).
a. Performance Check
(1) Ensure that the manual flow control valves that are in-line with the flowmeters are closed.
(2) Set the FUEL PUMP switch to ON.
(3) Open the manual hydrometer shutoff valves.
(4) Adjust the control valve to obtain a small amount of fuel circulating through the system.
(5) Open the indicator suction valve.
CAUTION
Do not allow the fuel to raise more than inch above the indicator
overflow tube. Damage to the hydrometer element may result.
(6) Slowly open the indicator inlet valve. Allow fuel to circulate into the hydrometer well and out the
overflow tubes.
(7) Collect a fuel sample in the hydrometer jar. Measure and record the fuel specific gravity using the
hydrometer from the calibration kit.
(8) Adjust the indicator inlet valve until the fuel level stabilizes and the hydrometer element assumes a
free-floating position. Close inlet valve.
(9) Note the two specific gravity indications and record. Verify that the calibrated hydrometer indication is
within 0 0.0017 of the nominal value of the fuel skid hydrometer.
Calibrated Hydrometer SG: ________
FEDS Hydrometer SG: ________
(10) Note the two thermometer values and record. Verify that the indicated temperature for the calibrated
hydrometer is within 1 F of the thermometer in the fuel well.
Calibrated Thermometer: ________
FEDS Thermometer: ________
(11)Allow the fuel to drain completely from the hydrometer well and close the indicator suction valve.
(12)Close the flow control valve.
(13)Set the FUEL PUMP switch to OFF.
(14)Close the manual hydrometer shutoff valve, close the manual valve, and close the fuel tank manual
shutoff valve..
27. Temperature Measurement System
a. Performance Check (Digital Temperature Indicator, Type-J (Iron-Const.) Thermocouple Channels)
NOTE
The Limit Control Panel, Temperature and Speed Limit Control (paragraph 35) may be
calibrated in conjunction with the digital temperatures indicator.
(1) Connect the thermocouple calibrator to P56, Engine Lube Discharge, of cable 20090787-1, which is
connected to the T700 side of the J-box. Use Type Jx thermocouple wire.
(2) Turn on the thermocouple calibrator and allow a 30 minute warm-up period. (Not required if using
Eurotron 2000T)
(3) Depress Channel 1 on the Doric Type J thermocouple switch.
(4) Adjust the thermocouple calibrator for Type J, 32 F temperature output.
(5) Verify that the Temperature Indicator indication is between 31 and 33 F. Adjust the Temperature
Indicator ice point reference potentiometer (R44) as necessary.
