However, if the low level warning system is under suspicion:

 (1) On the ECAM CONTROL PANEL push (in) the FUEL P/BSW.

 (2) On the FUEL System Display (Lower ECAM) examine the wing tank FQIs.

 (3) If either the wing tank FQI shows less than approximately 1500kg (3300lb) when the FOB BELOW 3 T memo message is given:

 - no maintenance steps are necessary.
 4. Fault Isolation
_______________
 A. If either wing tank FQI shows less than approximately 1500kg (3300lb) and the FOB BELOW 3 T memo message is not given:
 (1) Do the BITE test of the FLSS (Ref. AMM TASK 28-46-00-740-001).

 (2) If failures are detected examine the FLSS STATUS page for any of the messages that follow:

 - L(R) LO LEVEL SENSOR 15QJ1(2)

 - L(R) LO LEVEL SENSOR 40QJ1(2)

 - FLSCU1 7QJ

 - FLSCU2 9QJ.

 (3) If none of the above messages are shown:

 - go to step (5).

 (4) If one or more of the messages identified in Para 4.A.(2) are shown:

 - trouble shoot the LRU(s) before you start more steps. Refer to P. Block 101, CFDS for the related Task number.

 (5) On the MCDU set to:

 (a) CFDS.

 (b) SYSTEM REPORT/TEST.

 (c) FUEL.

 (d) INPUT PARAMETER VALUES page 3, the FQIS DISCRETE INPUTS.

 (6) Examine the bit positions as follows (a 0 = dry):

 (a) For the left wing:

 - E4 (15QJ1-LS5/FLSCU2)

 - H3 (40QJ1-LS8/FLSCU1).

 (b) For the right wing:

 - E3 (15QJ2-LS5/FLSCU1)

 - H4 (40QJ2-LS8/FLSCU2).

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A282
 May 01/05 CES

 NOTE : The Fuel Level Sensors Operating (Changeover) Values can
____
 be got from P. Block 301.

 (7) If both of the above bit positions in 4.A.(6)(a) or 4.A.(6)(b):

 (a) Show a 1, (when the sensors are dry):
 - go to P. Block 101 CFDS, or the Table of Contents for the Task number of the related LRU.

 (8) If both the bit positions in 4.A.(6)(a) or 4.A.(6)(b) show a 0, (the sensors are dry), and the fault continues:

 (a) Remove both FLSCUs from the rack (Ref. AMM TASK 28-46-34-000-001).

 (b) Apply power to the system/aircraft.

 (9) If the FOB BELOW 3 T memo message is:

 - not given:
 (10) Install one FLSCU (Ref. AMM TASK 28-46-34-400-001) at a time and then apply power to the system/aircraft:

 (11) Replace the FLSCU-1 (7QJ) and/or FLSCU-2 (9QJ), (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001) that causes the FOB BELOW 3 T memo message not to be given.

 (12) If the fault continues do a check of the aircraft wiring (Ref. ASM 28-46/02), between:

 - the FLSCU-1 rack connector AA pin 10B and the SDAC 1 connector AD pin 4F

 - the FLSCU-1 rack connector AA pin 10B and the SDAC 2 connector AD pin 4F

 - the FLSCU-2 rack connector AA pin 10B and the SDAC 1 connector AA pin 4D

 - the FLSCU-2 rack connector AA pin 10B and the SDAC 2 connector AA pin 4D

 - the FLSCU-1 rack connector AA pin 4C and the FLSCU-2 rack connector AA pin 9B

 - the FLSCU-1 rack connector AA pin 9B and the FLSCU-2 rack connector AA pin 4C.

 (13) Repair all the unserviceable wiring and connectors.

 (14) If the fault continues:
 - open the C/Bs 3WV (SDAC1) and 2WV (SDAC2) in turn:

 (15) If the fault is displayed on one powered/active SDAC:

 - interchange the SDACs to confirm the faulty LRU.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A283
 May 01/05 CES

 (16) Check/replace the SDAC-1 (1WV1) or SDAC-2 (1WV2), (Ref. AMM TASK 31-55-34-000-001) and (Ref. AMM TASK 31-55-34-400-001), that causes the FOB BELOW 3 T memo message not to be given:
 NOTE : When AIDS is installed in the aircraft, the AIDS PARA LABEL
____ CALL-UP Menu option can be used to identify which SDAC is not giving a memo message as shown in the table that follows.
 ---------------------------------------------------------------------------| PARA LABEL CALL-UP | SIGNAL DISCRIPTION | |---------------------------------| (LO LEVEL CHANs identified below | | EQ | SYS | LAB | SDI | DATABITS | refer to 1500kg/3300lb) | |----|-----|-----|-----|----------|-----------------------------------------| | 29 | 1 | 001 | 01 | 29 | L WING TK LO LEVEL CHAN B FROM SDAC 1 | | 29 | 1 | 001 | 00 | 29 | R WING TK LO LEVEL CHAN B FROM SDAC 1 | | 29 | 2 | 001 | 01 | 29 | L WING TK LO LEVEL CHAN B FROM SDAC 2 | | 29 | 2 | 001 | 00 | 29 | R WING TK LO LEVEL CHAN B FROM SDAC 2 | ---------------------------------------------------------------------------
　
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