REFERENCE DESIGNATION
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AWM 28-46-02
3. Fault Confirmation
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Do the Operational Test of the HI LVL Lights (Ref. AMM TASK 28-46-00-710-001).
NOTE : 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).
With the HIGH LVL TEST switch in the central (released) position
the lamp state, off or on, must agree with the bit indicator 0 or
1 respectively, in the Input Parameters Page 3.
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.
**ON A/C 301-399,
A. Do the Operational Test of the HI LVL Lights (Ref. AMM TASK 28-46-00-710-001).
NOTE : 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).
With the HIGH LVL TEST switch in the central (released) position
the lamp state, off or on, must agree with the bit indicator 0 or
1 respectively, in the Input Parameters Page 3.
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.
「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 A261
Aug 01/05 CES
**ON A/C ALL
4. Fault Isolation
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. If the LEFT HI LVL Indicator light fails to change state, from off to on, or from on to off:
- swap the FLSCU-1 (7QJ) with FLSCU-2 (9QJ) (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
(1) Do the test given in Para. 3.A.
(2) If the LEFT HI LVL Indicator light changes state during the test but the fault has transfered to RIGHT HI LVL Indicator light:
- replace the FLSCU-2 (9QJ) (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
(3) Do the test given in Para. 3.A.
(4) If the fault continues:
(5) Remove CTL PNL-REFUEL/DEFUEL (800VU) (Ref. AMM TASK 28-25-55-000-001).
(6) Do a check (Ref. AWM 28-46-02) with a multimeter of the SW-TEST/HI/LTS (2QJ) between:
- connector 4023VC, pin <C, and connector 4024VC, pin R, on the CTL
PNL-REFUEL/ DEFUEL (800VU). The multimeter must show: - open circuit for the switch in the central (released) position
- closed circuit for the switch in the TEST position.
NOTE : The LTS test checks the 28VDC supply to the CTL
____
PNL-REFUEL/DEFUEL (800VU).
(7) Replace the CTL PNL-REFUEL/DEFUEL (800VU), if it fails Step (6) (Ref. AMM TASK 28-25-55-000-001) and (Ref. AMM TASK 28-25-55-400-001).
NOTE : If due to airline operational conditions it is not possible to
____ replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal trouble-shooting is required, go to Step (12).
(8) If the fault continues do a check (Ref. AWM 28-46-01), and (Ref. AWM 28-46-02) of the aircraft wiring:
- between the CTL PNL-REFUEL/DEFUEL (800VU), connector 4024VC, pin R and the FLSCU-1 rack connector AA, pin 13B
- between the CTL PNL-REFUEL/DEFUEL (800VU), connector 4024VC, pin T and the FLSCU-1 rack connector AA, pin 7A
「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 A262
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