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two in each wing tank for 750kg fuel levels, 16QJ1 (16QJ2) and 39QJ1 (39QJ2)
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two in the center (transfer) tank 21QJ and 22QJ. The low level sensors in each wing tank are installed in pairs as follows:
-1500kg (3307lb) low level sensors. When both the sensors 15QJ1(15QJ2) and 40QJ1(40QJ2) are dry the FLSCUs send a fuel low level warning to the ECAM.
-750kg (1653lb) low level sensors. When both the sensors 16QJ1(16QJ2) and 39QJ1(39QJ2) are dry the FLSCUs send a fuel low level warning to the ECAM.
The two low level sensors in the center (transfer) tank are installed near to the lowest points on the LH and RH side of the tank. The low level sensors control the automatic transfer of fuel from the center (transfer) tank to their related wing tank. When one of the sensors has been dry for five minutes the FLSCUs send a close signal to the related control valve (Ref. 28-26-00).
**ON A/C ALL
(3) Full and Underfull Sensors:
-two full sensors in each wing tank 23QJ1 (23QJ2) and 27QJ1 (27QJ2)
-three underfull sensors in each wing tank 24QJ1 (24QJ2), 25QJ1 (25QJ2) and 26QJ1 (26QJ2).
1EFF : ALL 1 28-46-00Page 10 1 1 Nov 01/04R 1 1 1CES 1
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The full and underfull level sensors are installed in the wing tanks. The FLSCUs use the full and the underfull level sensor data to control the automatic operation of the center tank fuel pumps. This controls the wing tank fuel level. Data from the full level sensor is used to make sure the fuel level (in the wing tank) does not increase above the full mark. Data from the underfull level sensor is used to make sure that the fuel level (in the wing tank) does not decrease to less than 500 kg (1100 lb) below the full mark (with fuel in the center tank).
**ON A/C 301-399,
The full and underfull level sensors are in the wing tanks. The FLSCUs use the full and the underfull level sensor data to control the automatic operation of the center tank fuel pumps. When, during automatic fuel transfer, the full level sensors are wet the center tank fuel pumps are set to off. When, during automatic fuel transfer, the full and the related underfull level sensors are dry the center tank fuel pumps are set to on. The difference between the full and the underfull level sensors is approximately 200 kg (440 lb).
**ON A/C ALL
(4) Overflow Sensors:
- one in each wing surge tank 28QJ1(28QJ2).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The overflow sensor is installed in the wing surge tank, immediately below the overflow point of the tank. Small quantities of fuel from the tank venting system (Ref. 28-12-00) can go into the surge tank (and return to the fuel tank) but do not touch the overflow sensor. Thus the usual operation of the tank venting system does not cause the overflow sensors to give a wet indication. If an overflow sensor becomes wet the FLSCUs will send a signal to the FADEC to close the FRV (and thus stop the recirculation system (Ref. 28-16-00)).
1EFF : ALL 1 28-46-00Page 11 1 1 Aug 01/05 1 1 1CES 1
**ON A/C 301-399,
The overflow sensor is installed in the wing surge tank, immediately below the overflow point of the tank. Small quantities of fuel from the tank venting system (Ref. 28-12-00) can go into the surge tank (and return to the fuel tank) but do not touch the overflow sensor. Thus the usual operation of the tank venting system does not cause the overflow sensors to give an incorrect indication. If an overflow sensor becomes wet the FLSCUs will send a signal to:
-
the annunciator light test and dimming system (Ref. 33-14-00). This system will signal the related L XFR/R XFR TK pump pushbutton switch (5QL, 6QL) (Ref. 28-26-00) FAULT annunciator to come on
- the ECAM Engine/Warning Display (EWD) to show the warning FUEL -L(R) WING TK OVERFLOW
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the FADEC to close the FRV (and thus stop the recirculation system (Ref. 28-16-00)).
**ON A/C ALL
(5) IDG Shut-off Sensors: - one in each wing tank 38QJ1(38QJ2). The IDG shut-off sensors stop the IDG cooling when the fuel quantity is less than 280kg (616lb). The FLSCUs signal the FADEC to close the FRV, which stops the fuel flow from the IDG cooling system to the recirculation system.
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