- 28-46-34 FUEL LEVEL SENSING FLSCU1(2) 7QJ(9QJ).
(3) If any warnings (listed in step (1)) and/or messages (listed in step (2)) are shown, time correlate the warnings and messages as applicable.
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R (4) Go to the applicable ATA Chapter with these fault symptoms (warnings R and/or messages) and do the trouble shooting procedure related to the R failure message before you continue with more steps.
(5) If necessary reconnect the applicable IDG 1(2) (Ref. AMM TASK 24-21-00-710-040).
(6) Make sure that the C/Bs that follow are closed:
- C/B-FUEL/CTR TK/L & R XFR/CTL & IND (1QL)
- C/B-FUEL/CTR TK/L & R XFR/CTL & IND (2QL).
NOTE : If the related DC BUS is not powered and the C/Bs not closed
____ the applicable FLSCU cannot issue/supply an IDG/FRV open command. This is because a FLSCU will give a false CLOSE IDG/FRV output when it is not powered (de-energized condition).
(7) Do the EIS Start Procedure (ECAM only) (Ref. AMM TASK 31-60-00-860-001).
(8) On the ECAM control panel, push (in) the FUEL P/BSW.
(9) Make sure that the FUEL page shows on the ECAM lower Display Unit (DU).
(10) Monitor the FUEL system display (lower ECAM DU) and make sure that:
- all the fuel pumps are shown green in-line
- the L (R) inner wing temperature is less than 52.5 deg C
- the L (R) wing tank contains more than 290 kg (639.3403 lb) of fuel to make sure that the IDG Shut Off Sensor 38QJ1(2) is wet refuel if necessary (Ref. AMM TASK 12-11-28-650-003) or (Ref. AMM TASK 12-11-28-650-004)
- the Crossfeed Valve is open.
NOTE : These fuel conditions will let the IDG cooler fuel be returned
____ to the related wing tank if necessary.
(11) Do the power plant Minimum Idle Check (Ref. AMM TASK 71-00-00-710-006).
(12) On the ECAM control panel, push (in) the ELECT P/BSW.
(13) On the ELECT system display (lower ECAM DU), monitor the IDG 1 and IDG 2 oil temperatures.
(14) If any of IDG conditions that follow are shown, go to Para. 4.A:
- an IDG 1(2) OIL OVHT message, and
- the IDG 1(2) Oil Temperature shows pulsing green (more than the specified limit), or
- the IDG 1(2) Oil Temperature shows amber (high), or
- the IDG 1(2) Oil Temperature is more than IDG 2(1), but is less than the high limit.
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4. Fault Isolation
_______________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure
(1) If the failure is related to IDG-1, remove the Engine Interface Unit (EIU) 1KS1 (Ref. AMM TASK 73-25-34-000-040).
(2) If the failure is related to IDG-2, remove the EIU 1KS2 (Ref. AMM TASK 73-25-34-000-040).
(3) Use a multimeter, to do a test (Ref. ASM 28-16/01) to see if there is a ground at the EIU rack connector 1KS1(2)-AA, pin 2A.
NOTE : This step checks the input to the EIU, of the fuel logic for
____ the IDG cooling, from the related FLSCU-1(2) 7QJ(9QJ).
(4) If there is a ground on pin 2A of the rack connector 1KS1(2)-AA, go to step (6) (unserviceable).
NOTE : This shows that the EIU does not get an open command, for the
____ Fuel Return Valve (FRV), from the FLSS, 28-46-00.
(5) If there is no ground on pin 2A of the rack connector 1KS1(2)-AA (serviceable):
NOTE : This is the correct logic output from the FLSS, 28-46-00 for
____ the conditions (inputs) given in Para. 3.B.(10) and will let the FRV open if required.
(a) Install the EIU 1KS1(1KS2) removed in step (1) or (2) (Ref. AMM TASK 73-25-34-400-040).
(b) Do a check of the applicable Fuel Return Valve (FRV) (Ref. AMM TASK 73-11-50-720-001) and replace, if necessary, (Ref. AMM TASK 73-11-50-000-001) and (Ref. AMM TASK 73-11-50-400-001).
(c) If the fault continues: 1 Go to Para. 3.B. and do the examination of the fault symptoms
_ again for a possible alternative entry point(s).
2 Go to Para. 4.B. - Fuel Recirculation (Cooling) Pipe
_
Trouble-shooting.
(6) Remove the related FLSCU (Ref. AMM TASK 28-46-34-000-001).
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