W DOC AIRBUS | TSM A320F

TANK LEVEL SENSING - TASK SUPPORTING DATA

** ON A/C NOT FOR ALL
1. General
The diagrams that follow are to give you an introduction into the Fuel Level Sensing System (FLSS). This is to help you do the trouble-shooting tasks.

Also included are:
  • the Fuel Level Sensors Operating (Changeover) Values
  • the Fuel Temperature Level Sensors Operating (Changeover) Values
  • the FLSS BITE Inputs to the FQIC (3QT) from the FLSCUs 1 and 2, (7QJ/9QJ).

The FLSS - Physical Layout
F The FLSS - Physical Layout ** ON A/C NOT FOR ALL
F The FLSS - Physical Layout ** ON A/C NOT FOR ALL
The FLSS - Overall Block Diagram
F The FLSS - Overall Block Diagram ** ON A/C NOT FOR ALL
F The FLSS - Overall Block Diagram ** ON A/C NOT FOR ALL
The High Level Refuel Control Block Diagram
F High Level Refuel Control (Sensors 6QJ, 17QJ1, 17QJ2, 20QJ)-Three Tank Aircraft.
The Low Level Fuel Indication and Intercell Transfer Control Block Diagram
F Low Level Fuel Indication and Intercell Transfer Control (Sensors 15QJ1, 15QJ2, 16QJ1, 16QJ2, 39QJ1, 39QJ2) ** ON A/C NOT FOR ALL

The Low Level Fuel Indication ECAM Warning Block Diagram
F Low Level Fuel Indication - ECAM Warning (Sensors 16QJ1, 16QJ2, 39QJ1, 39QJ2) ** ON A/C NOT FOR ALL
The Low Level Fuel Indication ECAM Memo Block Diagram
F Low Level Fuel Indication - ECAM Memo (Sensors 15QJ1, 15QJ2, 40QJ1, 40QJ2) ** ON A/C NOT FOR ALL
The Center Tank Pump and Recirc Control Block Diagram
F Center Tank Pump and Recirc Control (Sensors 23QJ1/2, 24QJ1/2, 25QJ1/2, 26QJ1/2, 27QJ1/2, 21QJ, 22QJ)-Three Tank Aircraft. ** ON A/C NOT FOR ALL
The Center Tank Main Transfer System Valve Control Block Diagram
F The Center Tank Main Transfer System Valve Control Block Diagram ** ON A/C NOT FOR ALL
The IDG Cooling Control Block Diagram
F IDG Cooling Control (Sensors 28QJ1, 28QJ2, 29QJ1, 29QJ2, 30QJ1, 30QJ2, 38QJ1, 38QJ2)-Three Tank Aircraft. ** ON A/C NOT FOR ALL
F IDG Cooling Control (Sensors 28QJ1, 28QJ2, 29QJ1, 29QJ2, 38QJ1, 38QJ2, 41QJ, 42QJ)-A321 Aircraft. ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
2. Fuel Level Sensors Operating (Changeover) Values

The fuel values in the table below are nominal and given as a guide only.
This is because of:
  • the fuel density variations possible (the values shown are at standard density)
  • the different aircraft attitudes possible
  • the tolerances in the FQIS used to get the fuel amounts
  • the mechanical tolerances
  • the alternative dry bay configurations on early aircraft
  • the time delays and tolerances in the FLSS.
NOTE: The fuel quantities shown refer to:
  • the Center Tank for 20QJ, 21QJ, and 22QJ
  • the Inner Cell for all other sensors.
---------------------------------------------------------------------------
! Sensor ! Description and Position ! Fuel Quantity ! CFDS !
! FIN ! ! Kg ! BIT !
!--------!-------------------------------!---------------------!------------!
! 6QJ ! Dummy sensor ! ---- ! L1 !
! 15QJ1 ! Left wing low level ! 770 ! L6 !
! 15QJ2 ! Right wing low level ! 770 ! M7 !
! 16QJ1 ! Left wing low level ! 770 ! P3 !
! 16QJ2 ! Right wing low level ! 770 ! P4 !
! 17QJ1 ! Left wing high level ! 5430 ! N3 !
! 17QJ2 ! Right wing high level ! 5430 ! J3 !
! 20QJ ! Center high level ! 6470 ! N4 !
! 21QJ ! Center low level ! 130 ! P7 !
! 22QJ ! Center low level ! 130 ! J4 !
! 23QJ1 ! Left inner full ! 2770 ! P5 !
! 23QJ2 ! Right inner full ! 2770 ! J5 !
! 24QJ1 ! Left inner underfull ! 1770 ! N5 !
! 24QJ2 ! Right inner underfull ! 1770 ! L8 !
! 25QJ1 ! Left inner underfull ! 4590 ! M2 !
! 25QJ2 ! Right inner underfull ! 4590 ! J6 !
! 26QJ1 ! Left inner underfull ! 5030 ! N1 !
! 26QJ2 ! Right inner underfull ! 5030 ! L3 !
! 27QJ1 ! Left wing inner full ! 5570 ! P8 !
! 27QJ2 ! Right wing inner full ! 5570 ! L2 !
! 28QJ1 ! Left wing surge ! ---- ! N8 !
! 28QJ2 ! Right wing surge ! ---- ! M8 !
! 38QJ1 ! Left wing low level ! 270 ! M1 !
! 38QJ2 ! Right wing low level ! 270 ! L7 !
! 39QJ1 ! Left wing low level ! 750 ! L5 !
! 39QJ2 ! Right wing low level ! 750 ! P6 !
! ! ! ! !
---------------------------------------------------------------------------


The fuel values in the table below are nominal and given as a guide only.
This is because of:
  • the fuel density variations possible (the values shown are at standard density)
  • the different aircraft attitudes possible
  • the tolerances in the FQIS used to get the fuel amounts
  • the mechanical tolerances
  • the alternative dry bay configurations on early aircraft
  • the time delays and tolerances in the FLSS.
NOTE: The fuel quantities shown refer to:
  • the Center Tank for 20QJ, 21QJ, and 22QJ
  • the Inner Cell for all other sensors.
---------------------------------------------------------------------------
! Sensor ! Description and Position ! Fuel Quantity ! CFDS !
! FIN ! ! lb ! BIT !
!--------!-------------------------------!---------------------!------------!
! 6QJ ! Dummy sensor ! ---- ! L1 !
! 15QJ1 ! Left wing low level ! 1700 ! L6 !
! 15QJ2 ! Right wing low level ! 1700 ! M7 !
! 16QJ1 ! Left wing low level ! 1700 ! P3 !
! 16QJ2 ! Right wing low level ! 1700 ! P4 !
! 17QJ1 ! Left wing high level ! 11960 ! N3 !
! 17QJ2 ! Right wing high level ! 11960 ! J3 !
! 20QJ ! Center high level ! 14260 ! N4 !
! 21QJ ! Center low level ! 280 ! P7 !
! 22QJ ! Center low level ! 280 ! J4 !
! 23QJ1 ! Left inner full ! 6100 ! P5 !
! 23QJ2 ! Right inner full ! 6100 ! J5 !
! 24QJ1 ! Left inner underfull ! 3900 ! N5 !
! 24QJ2 ! Right inner underfull ! 3900 ! L8 !
! 25QJ1 ! Left inner underfull ! 10120 ! M2 !
! 25QJ2 ! Right inner underfull ! 10120 ! J6 !
! 26QJ1 ! Left inner underfull ! 11080 ! N1 !
! 26QJ2 ! Right inner underfull ! 11080 ! L3 !
! 27QJ1 ! Left wing inner full ! 12280 ! P8 !
! 27QJ2 ! Right wing inner full ! 12280 ! L2 !
! 28QJ1 ! Left wing surge ! ---- ! N8 !
! 28QJ2 ! Right wing surge ! ---- ! M8 !
! 38QJ1 ! Left wing low level ! 600 ! M1 !
! 38QJ2 ! Right wing low level ! 600 ! L7 !
! 39QJ1 ! Left wing low level ! 1660 ! L5 !
! 39QJ2 ! Right wing low level ! 1660 ! P6 !
! ! ! ! !
---------------------------------------------------------------------------


The fuel values in the table below are nominal and given as a guide only.
This is because of:
  • the fuel density variations possible (the values shown are at standard density)
  • the different aircraft attitudes possible
  • the tolerances in the FQIS used to get the fuel amounts
  • the mechanical tolerances
  • the time delays and tolerances in the FLSS.
NOTE: The fuel quantities shown refer to:
  • the Center Tank for 20QJ, 21QJ, and 22QJ
  • the Wing Tanks for all other sensors.
---------------------------------------------------------------------------
! Sensor ! Description and Position ! Fuel Quantity ! CFDS !
! FIN ! ! Kg ! BIT !
!--------!-------------------------------!---------------------!------------!
! 6QJ ! FLSCU2 LS7 CTR/HI/LV/DUMMY ! ---- ! G4 !
! 15QJ1 ! FLSCU2 LS5 L/LO LEVEL ! 1410 ! E4 !
! 15QJ2 ! FLSCU1 LS5 R/LO LEVEL ! 1410 ! E3 !
! 16QJ1 ! FLSCU1 LS1 L/WING LO LEVEL ! 770 ! A3 !
! 16QJ2 ! FLSCU2 LS1 R/WING LO LEVEL ! 770 ! A4 !
! 17QJ1 ! FLSCU1 LS3 L/WING HI LEVEL ! 6120 ! C3 !
! 17QJ2 ! FLSCU2 LS3 R/WING HI LEVEL ! 6120 ! C4 !
! 20QJ ! FLSCU1 LS7 CENTER HI LEVEL ! 6500 ! G3 !
! 21QJ ! FLSCU1 LS6 CENTER LO LEVEL ! 150 ! F3 !
! 22QJ ! FLSCU2 LS6 CENTER LO LEVEL ! 150 ! F4 !
! 23QJ1 ! FLSCU1 LS11 L/WING FULL A ! 2760 ! K3 !
! 23QJ2 ! FLSCU2 LS11 R/WING FULL A ! 2760 ! K4 !
! 24QJ1 ! FLSCU1 LS13 L/W UND/FULL A ! 1940 ! M3 !
! 24QJ2 ! FLSCU2 LS13 R/W UND/FULL A ! 1940 ! M4 !
! 25QJ1 ! FLSCU1 LS14 L/W UND/FULL B ! 5280 ! N3 !
! 25QJ2 ! FLSCU2 LS14 R/W UND/FULL B ! 5280 ! N4 !
! 26QJ1 ! FLSCU1 LS15 L/W UND/FULL C ! 5750 ! P3 !
! 26QJ2 ! FLSCU2 LS15 R/W UND/FULL C ! 5750 ! P4 !
! 27QJ1 ! FLSCU1 LS12 L/WING FULL B ! 5970 ! L3 !
! 27QJ2 ! FLSCU2 LS12 R/WING FULL B ! 5970 ! L4 !
! 28QJ1 ! FLSCU1 LS4 L/SURGE HI LEVEL ! ---- ! D3 !
! 28QJ2 ! FLSCU2 LS4 R/SURGE HI LEVEL ! ---- ! D4 !
! 38QJ1 ! FLSCU1 LS10 L/WING LO LEVEL ! 290 ! J3 !
! 38QJ2 ! FLSCU2 LS10 R/WING LO LEVEL ! 290 ! J4 !
! 39QJ1 ! FLSCU2 LS2 L/WING LO LEVEL ! 770 ! B4 !
! 39QJ2 ! FLSCU1 LS2 R/WING LO LEVEL ! 770 ! B3 !
! 40QJ1 ! FLSCU1 LS8 L/WING LO LEVEL ! 1410 ! H3 !
! 40QJ2 ! FLSCU2 LS8 R/WING LO LEVEL ! 1410 ! H4 !
! ! ! ! !
---------------------------------------------------------------------------

ACT Fuel Level Sensors Operating (Changeover) Values

Each ACT fuel probe have one FQIS capacitive sensor, and two FLSS thermistor (Resistance Temperature Detector - RTD) sensors together in one LRU.

For the ACT Tank Units DC Capacitance Values see Chap. 28-42-00, P. Block 301.

The fuel values in the table below are nominal and given as a guide only.
This is because of:
  • the fuel density variations possible (the values shown are for a fuel with a standard density of 0.8)
  • the different aircraft attitudes possible
  • the tolerances in the FQIS used to get the fuel quantities
  • the 10.0 kg (20.0 lb) resolution (increments) of the FQI digital display
  • the mechanical tolerances
  • the time delays and tolerances in the FLSS.
NOTE: There is no automatic FQIC controlled FLSS BITE done on the ACT level sensors.
NOTE: The ACT level sensor channel states in FLSCU-3 (47QJ) are not monitored by the FQIC, and therefore not shown on the CFDS FUEL - INPUT PARAMETER Page 3.
NOTE: The ACT HI LVL lamp (on the ACT REFUEL panel) shows the high level sensors operating/changeover point in relation to the ACT FQI.
---------------------------------------------------------------------------
! SENSOR ! PROBE ! FUEL QUANTITY ! CFDS !
! FIN ! FUNCTIONAL DESIGNATION ! kg (lb) ! BIT !
!--------!-------------------------------!---------------------!------------!
! 65QT1 ! HIGH LEVEL SENSOR - Part of ! Not applicable ! Not !
! ! PROBE-FUEL QTY, ! (Sensor output ! available !
! ! No. 1 ACT 1 ! grounded at 7617VC1)! !
! ! ! ! !
! 65QT1 ! LOW LEVEL SENSOR - Part of ! 60.0 kg (140.0 lb) ! Not !
! ! PROBE-FUEL QTY, ! ! available !
! ! No. 1 ACT 1 ! ! !
! ! ! ! !
! 66QT1 ! HIGH LEVEL SENSOR - Part of ! 2,390 kg (5,260 lb) ! Not !
! ! PROBE-FUEL QTY, ! ! available !
! ! No. 2 ACT 1 ! ! !
! ! ! ! !
! 66QT1 ! LOW LEVEL SENSOR - Part of ! 60.0 kg (140.0 lb) ! Not !
! ! PROBE-FUEL QTY, ! ! available !
! ! No. 2 ACT 1 ! ! !
---------------------------------------------------------------------------

** ON A/C NOT FOR ALL
3. Fuel Temperature Level Sensors Operating (Changeover) Values

The fuel temperature level sensors:
  • are part of the FLSS
  • give inputs to the IDG cooling control system to indicate the fuel is above or below a predetermined temperature value as shown in the table below.

The fuel temperatures can be obtained from either:
  • the CFDS(FUEL), FQIS INPUT PARAMETERS (Page 1) shown as INNTEMP and OUTTEMP
  • the Lower Ecam Display (System Display) switched to FUEL.
NOTE: The fuel temperatures shown will have a close relationship to the aircrafts recent transit/local air temperature, and conditions.
To observe the working of the Fuel System via the CFDS(FUEL), INPUT PARAMETERS pages in real time the pages must be continually updated.
Do this by cycling the pages using the NEXT PAGE control on the MCDU.
If this procedure is not adopted the pages STATE, 0 or 1, and fuel temperatures shown will remain as they were at the time of the page (menu option) selection.

-----------------------------------------------------------------------------
! Sensor ! Description and Position ! Fuel Temp ! CFDS ! STATE ! STATE !
! FIN ! ! deg. C. ! BIT ! 0 ! 1 !
!--------!---------------------------------!-----------!------!-------!-------!
! 29QJ1 ! Left wing inner temp (FL1/T1) ! 52.5 ! N6 ! <T ! >T !
! 29QJ2 ! Right wing inner temp (FL2/T1) ! 52.5 ! J2 ! <T ! >T !
! 30QJ1 ! Left wing outer temp (FL1/T2) ! 55.0 ! M3 ! <T ! >T !
! 30QJ2 ! Right wing outer temp (FL2/T2) ! 55.0 ! J8 ! <T ! >T !
-----------------------------------------------------------------------------


The fuel temperature level sensors:
  • are part of the FLSS
  • give inputs to the IDG cooling control system to indicate the fuel is above or below a predetermined temperature value as shown in the table below.

The fuel temperatures can be obtained from either:
  • the CFDS(FUEL), FQIS INPUT PARAMETERS (Page 1) shown as UCMP T (CTR and RIGHT) and, TEMP (LEFT and RIGHT)
  • the Lower Ecam Display (System Display) switched to FUEL.
NOTE: The fuel temperatures shown will have a close relationship to the aircrafts recent transit/local air temperature, and conditions.
The INPUT PARAMETER pages (only) are automatically updated, without request from the CFDS, once every 5.5 seconds.

-----------------------------------------------------------------------------
! Sensor ! Description and Position ! Fuel Temp ! CFDS ! STATE ! STATE !
! FIN ! ! deg. C. ! BIT ! 0 ! 1 !
!--------!---------------------------------!-----------!------!-------!-------!
! 29QJ1 ! Left wing temperature (FL1/T1) ! 52.5 ! D5 ! <T ! >T !
! 29QJ2 ! Right wing temperature (FL2/T1) ! 52.5 ! J5 ! <T ! >T !
-----------------------------------------------------------------------------

** ON A/C NOT FOR ALL
4. FLSS BITE Inputs to the FQIC (3QT) from the FLSCU-1 (7QJ)
-------------------------------------------------------------------------------
Sensor FIN FQIC Description BITE FQIC Input
Channel pin test (Volts)
-------------------------------------------------------------------------------
WET DRY
LS1 16QJ1 C-4D Left Wing Low Level 2 12.5 0
LS2 39QJ2 C-4C Right Wing Low Level 2 12.5 0
LS3 17QJ1 C-4H Left Wing High Level 1 0 12.5
LS4 28QJ1 C-4G Left Wing Surge Tank 1 0 12.5
LS5 15QJ2 C-3B Right Wing Low Level 3 12.5 0
LS6 21QJ C-3A Center Tank Low Level 2 0 12.5
LS7 20QJ C-3K Center Tank High Level 1 0 12.5
LS8 40QJ1 C-3J Left Wing Low Level 2 12.5 0
LS10 38QJ1 C-3D Left Wing Low Level 4 0 12.5
LS11 23QJ1 C-3C Left Wing Full 4 0 12.5
LS12 27QJ1 C-3H Left Wing Full 4 0 12.5
LS13 24QJ1 C-3G Left Wing Underfull 4 0 12.5
LS14 25QJ1 C-2B Left Wing Underfull 4 0 12.5
LS15 26QJ1 C-2A Left Wing Underfull 4 0 12.5
LOW HIGH
T1 29QJ1 C-2J Left Wing temp. sensor 4 0 12.5
T2 41QJ C-2D Dummy Temperature Channel 4 0 12.5
ENABLE DISABLE
LOGIC 1 7QJ C-4B L/Wing IDG Recirculation 4 12.5 0
LOGIC 2 7QJ C-4A Center Tank to Left Wing 4 0 12.5
Tank Fuel Transfer Control
FAIL OK
All of C-2K FLSCU-1 Sensor Failure - 12.5 0
the
above

-------------------------------------------------------------------------------
Sensor FIN FQIC Description BITE FQIC Input
Channel pin test (Volts)
-------------------------------------------------------------------------------
WET DRY
LS1 16QJ1 B-2J Left Wing Low Level 2 12.5 0
LS2 39QJ2 B-4G Right Wing Low Level 3 12.5 0
LS3 17QJ1 B-6G Left Wing High Level 1A 0 12.5
LS4 28QJ1 B-2K Left Wing Surge High Level 1B 0 12.5
LS5 16QJ2 B-5G Right Wing Low Level 3 12.5 0
LS6 21QJ B-3H Center Tank Low Level 2 0 12.5
LS6 #35QJ B-3H Center Tank Low Level (Dummy/Wet) 2 0 12.5
LS7 20QJ B-7G Center Tank High Level 1A 0 12.5
LS7 #37QJ B-7G Center Tank High Level (Dummy/Wet) 1A 0 12.5
LS10 38QJ1 B-3K Left Wing Low Level 4 0 12.5
LS11 23QJ1 B-3J Left Wing Inner Cell Full 4* 0 12.5
LS12 27QJ1 B-4H Left Wing Inner Cell Full 4* 0 12.5
LS13 24QJ1 B-4J Left Wing Inner Cell Underfull 4* 0 12.5
LS14 25QJ1 B-4K Left Wing Inner Cell Underfull 4* 0 12.5
LS15 26QJ1 B-5H Left Wing Inner Cell Underfull 4* 0 12.5
LOW HIGH
T1 29QJ1 B-5J Left Inner Cell Temperature Sensor 4 0 12.5
T2 30QJ1 B-5K Left Outer Cell Temperature Sensor 4 0 12.5
ENABLE DISABLE
LOGIC 1 7QJ B-6J Left Wing IDG Cooling Control 4 12.5 0
LOGIC 2 7QJ B-6K Center Tank Pump 1 Control 4* 0 12.5
OPEN NOT
B-5E Left Wing FWD ICTV OPEN switch 3 28.0 ground
SHUT NOT
B-6E Left Wing FWD ICTV SHUT switch 3 28.0 o/cct
OPEN NOT
B-11B Left Wing REAR ICTV OPEN switch 2 28.0 ground
SHUT NOT
B-12B Left Wing REAR ICTV SHUT switch 2 28.0 o/cct
FAIL OK
B-6H FLSCU-1 Sensor Failure All 12.5 0
# Dummy sensors are fitted to 2 tank aircraft, FIN is for Dummy sensor.
* These Channels are NOT tested on 2 tank aircraft.

** ON A/C NOT FOR ALL
5. FLSS BITE Inputs to the FQIC (3QT) from the FLSCU-2 (9QJ)
-------------------------------------------------------------------------------
Sensor FIN FQIC Description BITE FQIC Input
Channel pin test (Volts)
-------------------------------------------------------------------------------
WET DRY
LS1 16QJ2 C-2G Right Wing Low Level 2 12.5 0
LS2 39QJ1 C-1B Left Wing Low Level 2 12.5 0
LS3 17QJ2 C-1A Right Wing High Level 1 0 12.5
LS4 28QJ2 C-1K Right Wing Surge Tank 1 0 12.5
LS5 15QJ1 C-1J Left Wing Low Level 3 12.5 0
LS6 22QJ C-1D Center Tank Low Level 2 0 12.5
LS7 6QJ C-1C Ctr Tk High Level (Dummy) 1 0 12.5
LS8 40QJ2 C-1H Right Wing Low Level 2 12.5 0
LS10 38QJ2 C-1G Right Wing Low Level 4 0 12.5
LS11 23QJ2 C-2E Right Wing Full 4 0 12.5
LS12 27QJ2 C-1E Right Wing Full 4 0 12.5
LS13 24QJ2 C-1F Right Wing Underfull 4 0 12.5
LS14 25QJ2 C-2F Right Wing Underfull 4 0 12.5
LS15 26QJ2 C-4E Right Wing Underfull 4 0 12.5
LOW HIGH
T1 29QJ2 C-3F Right Wing temp. sensor 4 0 12.5
T2 42QJ C-4F Dummy Temperature Channel 4 0 12.5
ENABLE DISABLE
LOGIC 1 9QJ C-2C R/Wing IDG Recirculation 4 12.5 0
LOGIC 2 9QJ C-2H Center Tank to Right Wing 4 0 12.5
Tank Fuel Transfer Control
FAIL OK
All of C-3E FLSCU-2 Sensor Failure - 12.5 0
the
above

-------------------------------------------------------------------------------
Sensor FIN FQIC Description BITE FQIC Input
Channel pin test (Volts)
-------------------------------------------------------------------------------
WET DRY
LS1 15QJ2 B-9K Right Wing Low Level 2 12.5 0
LS2 39QJ1 B-10J Left Wing Low Level 3 12.5 0
LS3 17QJ2 B-11H Right Wing High Level 1A 0 12.5
LS4 28QJ2 B-10K Right Wing Surge High Level 1B 0 12.5
LS5 15QJ1 B-11J Left Wing Low Level 3 12.5 0
LS6 22QJ B-11K Center Tank Low Level 2 0 12.5
LS6 #36QJ B-11K Center Tank Low Level (Dummy/Wet) 2 0 12.5
LS7 6QJ B-12H Center Tank High Level (Dummy/Dry) 1A 0 12.5
LS7 #6QJ B-12H Center Tank High Level (Dummy/Wet) 1A 0 12.5
LS10 38QJ2 B-12J Right Wing Low Level 4 0 12.5
LS11 23QJ2 B-12K Right Wing Inner Cell Full 4* 0 12.5
LS12 27QJ2 B-13H Right Wing Inner Cell Full 4* 0 12.5
LS13 24QJ2 B-13J Right Wing Inner Cell Underfull 4* 0 12.5
LS14 25QJ2 B-13K Right Wing Inner Cell Underfull 4* 0 12.5
LS15 26QJ2 B-14H Right Wing Inner Cell Underfull 4* 0 12.5
LOW HIGH
T1 29QJ2 B-15J Right Inner Cell Temperature Sensor 4 0 12.5
T2 30QJ2 B-15K Right Outer Cell Temperature Sensor 4 0 12.5
ENABLE DISABLE
LOGIC 1 9QJ B-14J Right Wing IDG Cooling Control 4 12.5 0
LOGIC 2 9QJ B-14K Center Tank Pump 2 Control 4* 0 12.5
OPEN NOT
B-7E Right Wing FWD ICTV OPEN switch 3 28.0 ground
SHUT NOT
B-8E Right Wing FWD ICTV SHUT switch 3 28.0 o/cct
OPEN NOT
B-13B Right Wing REAR ICTV OPEN switch 2 28.0 ground
SHUT NOT
B-14B Right Wing REAR ICTV SHUT switch 2 28.0 o/cct
FAIL OK
B-15H FLSCU-2 Sensor Failure All 12.5 0
# Dummy sensors are fitted to 2 tank aircraft, FIN is for Dummy sensor.
* These Channels are NOT tested on 2 tank aircraft.

** ON A/C NOT FOR ALL
6. Maintenance Notices
The maintence notices that follow are to give you an introduction or understanding of possible reported problems associated with the Fuel Level Sensing System (FLSS).

The maintenance notices provide useful data for the maintenance staff.
[Rev.8 from Aug 2018] 2026.04.04 04:29:18 UTC
"WTRUIB" 2025