4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 A. If the inner cell FQIs on the related side(s) show more than approximately 750kg (1650lb) when the L(R) or L + R WING TK LO LVL warning is 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 LO LEVEL SENSOR 16QJ1

 - L LO LEVEL SENSOR 39QJ1

 - R LO LEVEL SENSOR 15QJ2

 - R LO LEVEL SENSOR 39QJ2

 - 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 1 = wet):

 (a) For the left wing:

 - P3 (16QJ1-LS1/FLSCU1)

 - L5 (39QJ1-LS2/FLSCU2).

 (b) For the right wing:

 - M7 (15QJ2-LS1/FLSCU2)

 - P6 (39QJ2-LS2/FLSCU1).

 「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 : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A246
 Aug 01/05 CES

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

 (a) Show a 0, (when the sensors are wet):
 - go to P. Block 101 CFDS, or the Table of Contents for the Task number of the related LRU.

 (8) If all above bit positions show a 1, (the sensors are wet), 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 Fuel Low Level Warning is:

 (a) Not given:
 1 Install one FLSCU (Ref. AMM TASK 28-46-34-400-001) at a time
_ and then apply power to the system/aircraft:
 2 Replace the FLSCU-1 (7QJ) or FLSCU-2 (9QJ), (Ref. AMM TASK 28-
_ 46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001) that causes the Low Level Warning to be given.
 (b) Given:
 1 Do a wiring check (Ref. ASM 28-46/02) of the aircraft wiring:
_
 - between the FLSCU-1 rack connector AA pin 10A and the SDAC 1 connector AD pin 13K

 - between the FLSCU-1 rack connector AA pin 10A and the SDAC 1 connector AD pin 14K

 - between the FLSCU-1 rack connector AA pin 10A and the SDAC 2 connector AD pin 13K

 - between the FLSCU-1 rack connector AA pin 10A and the SDAC 2 connector AD pin 14K

 - between the FLSCU-2 rack connector AA pin 10A and the SDAC 1 connector AA pin 13D

 - between the FLSCU-2 rack connector AA pin 10A and the SDAC 1 connector AA pin 14D

 - between the FLSCU-2 rack connector AA pin 10A and the SDAC 2 connector AA pin 13D

 - between the FLSCU-2 rack connector AA pin 10A and the SDAC 2 connector AA pin 14D

 - between the FLSCU-1 rack connector AA pin 4A and the FLSCU-2 rack connector AA pin 9A

 - between the FLSCU-1 rack connector AA pin 9A and the FLSCU-2 rack connector AA pin 4A.

 (10) Repair all the unserviceable wiring and connectors.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A247
 201-299, 401-499, Aug 01/05 CES

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

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

 - swap SDACs to confirm the faulty LRU.

 (13) 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 cause(s) the false low level warning 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 giving a false warning as shown in the table below.
 ---------------------------------------------------------------------------| PARA LABEL CALL-UP | | |---------------------------------| SIGNAL DISCRIPTION | | EQ | SYS | LAB | SDI | DATABITS | | |----|-----|-----|-----|----------|-----------------------------------------| | 29 | 1 | 004 | 01 | 20 | L WING TK LO LEVEL CHAN A FROM SDAC 1 | | 29 | 1 | 004 | 01 | 21 | L WING TK LO LEVEL CHAN B FROM SDAC 1 | | 29 | 1 | 004 | 10 | 21 | R WING TK LO LEVEL CHAN A FROM SDAC 1 | | 29 | 1 | 004 | 10 | 20 | R WING TK LO LEVEL CHAN B FROM SDAC 1 | | 29 | 2 | 004 | 01 | 20 | L WING TK LO LEVEL CHAN A FROM SDAC 2 | | 29 | 2 | 004 | 01 | 21 | L WING TK LO LEVEL CHAN B FROM SDAC 2 | | 29 | 2 | 004 | 10 | 21 | R WING TK LO LEVEL CHAN A FROM SDAC 2 | | 29 | 2 | 004 | 10 | 20 | R WING TK LO LEVEL CHAN B FROM SDAC 2 | ---------------------------------------------------------------------------
　
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