- FLSCU-2 (9QJ)

 - HARNESS-LEFT WING TANK A (57QT)

 - HARNESS-RIGHT WING, TANK A (58QT)

 - SENSOR-LOW LVL (1500KG), L WING TANK CHANNEL A (40QJ1)

 - SENSOR-LOW LVL (1500KG), R WING TANK CHANNEL A (40QJ2)

 - aircraft wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-46-00-810-818 FLSCU1(2) 7QJ(9QJ) ESPM 20-00-00 AMM 28-10-00-910-001 Safety Procedures When You Do Work in a Fuel Tank AMM 28-10-00-910-002 Access to the Fuel Tanks and the Work Areas AMM 28-42-43-000-005 Removal of the Wing Tank Harness 57QT(58QT),
 63QT(64QT) AMM 28-42-43-000-008 Removal of the Wing Tank Fuel Quantity Indicating Probe Fused/Shorting Plug Connectors AMM 28-42-43-400-005 Installation of the Wing Tank Harness 57QT(58QT),
 63QT(64QT) AMM 28-46-00-740-001 Functional (BITE) Test AMM 28-46-15-000-001 Removal of the Wing-Tank Fuel-Level Sensors AMM 28-46-15-400-009 Installation of the Wing-Tank Fuel-Level Sensors 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)
 ASM 28-46/02
 AWM 28-46-04
 AWM 28-46-06

 「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 A220
 Aug 01/05R CES

 3. Fault Confirmation
__________________

R A. Test
R (1) Do the BITE test of the FLSS (Ref. AMM TASK 28-46-00-740-001).
R (2) Examine the FLSS STATUS page on the MCDU.
R (3) If the page shows messages for one or more of the other sensors and/or the FLSCU-1(2), do (Ref. TASK 28-46-00-810-818).
R (4) If the message 284615 L(R) LO LEVEL SENSOR 40QJ1(2):
R
R - is shown, do Para. 4.A.
R
R - is not shown, no work steps are necessary.

 NOTE : You can get more data from the:
____
 - 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 28-46/02). 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)

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

 NOTE : OPTIONAL TESTING:
____ Where a PSDA321-1 Test Set is available, a check can be made before a decision is made to go into or close up a fuel tank. The Test Set enables a GO/NOGO check to be made of the tank mounted components and wiring from the tank wall connectors.
 4. Fault Isolation
_______________
R A. Procedure
R (1) Do the steps applicable to the test equipment available.
R (2) Test Equipment.
 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.
R
 「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 : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A221
 May 01/05 CES

R (a) If there is:
R
R - approved test equipment available, go to Step (3)
R
R - no approved test equipment available, go to Step (6).

R (3) Get access to the tank wall connector 4039VC1(2)-A (for the wing tank
R harness 57QT(58QT) (Ref. AMM TASK 28-42-43-000-008)

R (4) Disconnect the free connector 4039VC1(2)-A from the receptacle
R 4039VC1(2).

R (5) Do a resistance check of the sensor 40QJ1(2) at the tank wall
R connector 4039VC1(2) between pins L and M (Ref. AWM 28-46-04).
R Make sure the resistance is between 330 and 480 ohms.

 If there is: R R - continuity as specified above, go to Step (6) R
 - no continuity as specified above (resistance check out of range), R go to Step (8).
R NOTE : The sensor status (wet or dry) and fuel/air temperature will
____ R have an effect on the resistance value.
R
R (6) Replace the FLSCU-1 (7QJ) (FLSCU-2 (9QJ)) (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
　
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