(8) If all above bit positions show a 1, (the sensors are wet), and the fault continues:
(a) Remove the two 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:
(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 FOB BELOW 3 T memo message to be given.
(b) Given:
1 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.
(10) Repair all the unserviceable wiring and connectors.
(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:
- 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 A287
May 01/05 CES
(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 FOB BELOW 3 T memo message 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 memo message as shown in the table below.
---------------------------------------------------------------------------| 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 | ---------------------------------------------------------------------------
「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 A288
May 01/05 CES
**ON A/C ALL
TASK 28-46-00-810-848
Center Tank Low Level Sensor 22QJ
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
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-2 (9QJ)
- HARNESS-CHAN B, CTR TK (18QT)
- SENSOR-LOW LVL, R CTR TK CHANNEL B (22QJ)
- aircraft wiring
- fused adaptor at 7512VC
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 FLSCU1(2) 7QJ(9QJ) R ESPM 20-00-00 AMM 28-10-00-910-001 Safety Procedures When You Do Work in a Fuel Tank
R AMM 28-10-00-910-002 Access to the Fuel Tanks and the Work Areas AMM 28-42-44-000-001 Removal of the Center Tank Harness 17QT AMM 28-42-44-400-001 Installation of the Center Tank Harness 17QT AMM 28-46-00-740-001 Functional (BITE) Test AMM 28-46-15-000-004 Removal of the Center-Tank Fuel-Level Sensors AMM 28-46-15-400-012 Installation of the Center-Tank Fuel-Level Sensors AMM 28-46-34-000-001 Removal of the Fuel-Level Sensing Control-Unit
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