_______
 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
_______________
 - FLSCU-1 (7QJ)

 - HARNESS-CHAN A, CTR TK (17QT)

 - SENSOR-LOW LVL, L CTR TK CHANNEL A (21QJ)

 - aircraft wiring

 - fused adaptor at 7509VC

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific multimeter
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-46-00-810-818 
R  ESPM 20-00-00
 AMM  28-10-00-910-001 
R  AMM  28-10-00-910-002 
AMM  28-42-44-000-001 
AMM  28-42-44-400-001 
AMM  28-46-00-740-001 
AMM  28-46-15-000-004 
AMM  28-46-15-400-012 
AMM  28-46-34-000-001 
AMM  28-46-34-400-001 

FLSCU1(2) 7QJ(9QJ)
Safety Procedures When You Do Work in a Fuel Tank Access to the Fuel Tanks and the Work AreasRemoval of the Center Tank Harness 17QTInstallation of the Center Tank Harness 17QTFunctional (BITE) TestRemoval of the Center-Tank Fuel-Level SensorsInstallation of the Center-Tank Fuel-Level SensorsRemoval of the Fuel-Level Sensing Control-Unit (FLSCU) (7QJ,9QJ)Installation of the Fuel-Level Sensing Control-Unit (FLSCU) (7QJ,9QJ)
 「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 : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 243
 May 01/05 CES

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 32-12-00-010-001 Open the Main Gear Doors for Access
 ASM 28-46/03
 AWM 28-21-07
 AWM 28-26-03
 AWM 28-46-06
 AWM 28-46-09

 3. Fault Confirmation
__________________
 A. Table of the circuit breakers referred to in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 121VU FUEL/CTR TK/PUMPS1 AND 2/CTL AND IND 31QA R25 **ON A/C 301-399,
 121VU FUEL/CTR TK/L&R XFR/CTL & IND 1QL R25 R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 B. Test
 (1) Do the BITE test of the FLSS (Ref. AMM TASK 28-46-00-740-001). NOTE : The 28VDC power supply for the FLSCU-1 (7QJ) low level channel

____
 21QJ/(LS6) is from the C/B-31QA.

 (2) Examine the FLSS STATUS page on the MCDU.

 (3) If a fault message(s) for one or more of the other FLSS sensors and/or the FLSCU-1 (7QJ) is shown:

 - do (Ref. TASK 28-46-00-810-818).

 (4) If the message 284615 C LO LEVEL SENSOR 21QJ:

 - is shown, do Para. 4.A.

 - is not shown, no work steps are necessary. NOTE : You can get more data from the:

____
 「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 244
 Aug 01/05 CES

 - Aircraft Maintenance Manual (AMM) Chap. 28-46-00, the Fuel Level Sensing System, Description and Operation (D and O)

 - Trouble Shooting Manual (TSM) - Task Supporting Data (Ref.

 P. Block 301)

 - Aircraft Schematic Manual (ASM) (Ref. ASM 28-46/03). You can get more Trouble-shooting data from the CFDS(FUEL):

 - Input Parameters Page 3 (Ref. P. Block 301), used with the Fuel Level Sensors Operating (Changeover) Values (Ref. P. Block 301)

 - FLSCU Trouble-shooting Data (Ref. P. Block 301).

 NOTE : OPTIONAL TESTING:
____ Where a PSD A320-2 Fuel Level Sensing Test Set is available measurements can be taken before a decision is made to go into or close up a fuel tank. The Test Set enables the tank mounted components and tank wiring to be tested from the tank wall connectors.
　
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