TASK 28-46-00-810-847
FUEL - FOB BELOW 3 T Memo Message Shown Permanently
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
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WARNING : WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST
_______ EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT, E.G. EN50-020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
1. Possible Causes
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- FLSCU-1 (7QJ)
- FLSCU-2 (9QJ)
- SDAC-1 (1WV1)
- SDAC-2 (1WV2)
- aircraft wiring
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-46-00-740-001 Functional (BITE) Test AMM 28-46-34-000-001 Removal of the Fuel-Level Sensing Control-Unit (FLSCU) (7QJ,9QJ) AMM 28-46-34-400-001 Installation of the Fuel-Level Sensing Control-Unit
(FLSCU) (7QJ,9QJ)
AMM 31-55-34-000-001 Removal of the SDAC (1WV1,1WV2)
AMM 31-55-34-400-001 Installation of the SDAC (1WV1,1WV2)
ASM 28-46/02
3. Fault Confirmation
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A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU SDAC/1/SPLY 3WV F04 121VU EIS/SDAC/2/SPLY 2WV Q06
B. During normal operation of the FLSS/FWC/DMC this is a configuration memo. If in either wing tank a pair of low level sensors that are AND gated together become dry indicating a fuel level of less than approximately 1500kg (3300lb) the memo message is given. It is not a warning of a system/LRU failure or malfunction.
「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 A285
May 01/05 CES
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 both the wing tank FQIs show more than approximately 1500kg (3300lb) when the FOB BELOW 3 T memo message is not given:
- no maintenance steps are necessary.
4. Fault Isolation
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A. If the two wing tank FQIs show more than approximately 1500kg (3300lb) when the FOB BELOW 3 T memo message 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(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 1 = wet):
(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 A286
May 01/05 CES
NOTE : The Fuel Level Sensors Operating (Changeover) Values can
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be got from P. Block 301.
(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.
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