Indicating-System AMM 28-42-00-740-001 Status Report (BITE) AMM 28-42-00-740-003 Interrogation of the FQIS Input Parameters Pages AMM 28-42-22-000-001 Removal of the Fuel Quantity Indicator 6QT AMM 28-42-22-400-001 Installation of the Fuel Quantity Indicator 6QT AMM 31-32-00-860-001 Procedure to Get Access to the SYSTEM REPORT/TEST
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ASM 28-25/03
ASM 28-42/03
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3. Fault Confirmation
__________________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU FUEL/FQI/CHANNEL/1 AND 2 8QT L26
B. Test
NOTE : The Indicator (6QT) is only operational (electrically powered)
____ when the refuel door is open. The Indicator Power On BITE Tests are done at Indicator power on.
(1) Do an operational test of the indicator lights (Ref. AMM TASK 28-42-00-710-001).
(2) Look at the status report (BITE) of the fuel quantity indication system (Ref. AMM TASK 28-42-00-740-001).
(3) If the indicator operates as specified in the operational test and the message INDICATOR 6QT is not shown on the FQIS STATUS page, no maintenance steps are necessary.
(4) If the indicator LEDs do not come on at indicator power-up or the message INDICATOR 6QT is shown on the FQIS STATUS page:
- go to Para. 4.A.
(5) If an indicator single LED (or segment of), does not come on when the TEST switch (2QJ) is set to LTS:
- go to Para. 4.B.
(6) If the indicator LEDs, do not come on when the TEST switch (2QJ) is set to LTS:
- go to Para. 4.C.
4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure - The Indicator LEDs Do Not Come On At Indicator Power-up OR The Message INDICATOR 6QT Is Shown On The FQIS STATUS Page
(1) Examine the LEDs on the PRESELECTOR-FUEL QUANTITY, MULTI TANK (5QT).
(a) If the LEDs on the PRESELECTOR-FUEL QUANTITY, MULTI TANK (5QT) are on, go to step (7).
NOTE : This shows the C/B-8QT is closed, the RL-14QU energized
____
and 28VDC available.
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(b) If the LEDs on the PRESELECTOR-FUEL QUANTITY, MULTI TANK (5QT) are off, go to step (2).
NOTE : This shows the C/B-8QT is open, or a common 28VDC power
____ supply failure.
(2) On the MCDU go to SYSTEM REPORT/TEST - FUEL (Ref. AMM TASK 31-32-00-860-001).
(3) Do the Interrogation of the FQIS Input Parameter Pages (Ref. AMM TASK 28-42-00-740-003).
(4) Go to the Input Parameters Page 3 - FQIS DISCRETE INPUTS.
(5) Examine the bit 7R (28VDC FUELLING BUS 2, ON).
(a) If bit 7R shows a 1 (is on), go to step (6).
(b) If bit 7R shows a 0 (is off):
(6) Examine the bit 6R (TX FAULT/INDICATOR NOT POWERED).
(a) If the bit 6R shows a 0 (is on/no TX fault), replace the IND-FUEL QTY MULTI TANK (6QT) (Ref. AMM TASK 28-42-22-000-001) and (Ref. AMM TASK 28-42-22-400-001).
(b) If the bit 6R shows a 1 (is off/TX fault), go to step (7).
(7) Remove the indicator (6QT) (Ref. AMM TASK 28-42-22-000-001).
(8) Use a multimeter to do a test, at the indicator end connector 6QT-A, to make sure that the 28VDC is available between pin E (+ve) and pin D (-ve).
(9) If the 28VDC is available between pin E and pin D of the end connector 6QT-A, replace the IND-FUEL QTY MULTI TANK (6QT) (Ref. AMM TASK 28-42-22-000-001) and (Ref. AMM TASK 28-42-22-400-001).
1_ Do a check of and close or replace (if necessary) the
C/B-FUEL/FQI/CHANNEL/1 AND 2 (8QT).
2_ Do a check of the aircraft wiring (28VDC FUELLING BUS 2
electrical wire) between the C/B-FUEL/FQI/CHANNEL/1 AND 2
(8QT) and the FQIC (3QT) rack connector AB, pin 9D (Ref. ASM
28-42/03).
3_ Repair all the unserviceable wiring and connectors.
4_ Do the tests in Para. 3.B.
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