-the sensor is wet or dry (for the level sensors)
1EFF : ALL 1 28-46-00Page 12 1 1 Aug 01/05 1 1 1CES 1 -the adjacent fuel is hot (for the temperature sensors). The voltages that go back to the FLSCUs from groups of low level, full and underfull sensors go through groups of logic gates. The logic gates in the FLSCU control fuel transfer from the center tank to wing tanks and IDG re-circulation.
C. Temperature Sensors
The tank level sensing system has two temperature sensors, 29QJ1 (29QJ2) and 30QJ1 (30QJ2), installed in each wing tank. The temperature sensor 29QJ1 (29QJ2) is in the wing tank inner cell and is sensitive to temperatures of more than 52.5 deg C. The temperature sensor 30QJ1 (30QJ2) is in the wing tank outer cell and is sensitive to temperatures of more than 55 deg C.
Each temperature sensor is near the lowest part of the related fuel cell. This makes sure that the temperature sensor is in the fuel for most of the time.
**ON A/C 301-399,
B. Fuel Level Sensing Control Units (FLSCUs) The FLSCUs (7QJ and 9QJ) are in the FWD electronics rack 92VU, in the aircraft avionics bay. The FLSCUs use signal conditioning to correctly find the condition of the level and temperature sensors. Each FLSCU sends an electrical current to its related sensors, the voltage of which is set. When the electrical current comes back to an FLSCU from a sensor the voltage is measured. The FLSCUs compare the measured voltage to a set value to find if:
-
the sensor is wet or dry (for the level sensors)
-
the adjacent fuel is hot (for the temperature sensors). The voltages that go back to the FLSCUs from groups of low level, full and underfull sensors go through groups of logic gates. The logic gates in the FLSCU control fuel transfer from the center tank to the wing tanks and IDG re-circulation.
C. Temperature Sensors
The tank level sensing system has one temperature sensor, 29QJ1 (29QJ2), installed in each wing tank. It is sensitive to temperatures of more than
52.5 deg C.
Each temperature sensor is near the lowest part of the tank. This makes sure that the temperature sensor is in the fuel for most of the time.
1EFF : ALL 1 28-46-00Page 13 1 1 May 01/05R 1 1 1CES 1
**ON A/C ALL
D. Dummy Load Resistors
(1) Center-Tank High-Level Dummy-Load Resistor (6QJ) The FLSCU 1 and the FLSCU 2 are the same. But only the FLSCU 1 supplies center-tank high-level sensing (through the high level sensor 20QJ). The equivalent FLSCU 2 center-tank high-level sensing channel has the dummy-load resistor (6QJ). The dummy-load resistor makes sure that the center-tank high-level sensing channel in each FLSCU is used.
**ON A/C 301-399,
(2) Wing-Tank Temperature Dummy-Load Resistors (41QJ, 42QJ) The FLSCU 1 and the FLSCU 2 each have two temperature sensing channels. One temperature sensor 29QJ1(29QJ2) is connected to each of the FLSCUs. Thus one temperature sensing channel in each of the FLSCUs is not used. This channel has the wing-tank temperature dummy-load resistor 41QJ(42QJ) connected to it The dummy-load resistors make sure that the temperature sensing channel in each FLSCU is used.
**ON A/C ALL
4. Power Supply
____________
(Ref. Fig. 002)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 003)
**ON A/C 301-399,
(Ref. Fig. 003A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 004)
1EFF : ALL 1 28-46-00Page 14 1 1 Aug 01/05 1 1 1CES 1 1EFF : ALL 1 28-46-00Page 15 1 1 Aug 01/05 1 1 1CES 1
**ON A/C 301-399,
R (Ref. Fig. 004A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 005) **ON A/C 301-399,
(Ref. Fig. 005A) **ON A/C ALL
R 5. Interfaces__________ **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
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