REFERENCE DESIGNATION
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AMM 28-42-34-400-001 Installation of the Fuel Quantity-Indicating Computer (FQIC) (3QT) AMM 31-32-00-860-001 Procedure to Get Access to the SYSTEM REPORT/TEST
Menu Page
ASM 28-25/03
ASM 28-42/03
3. Fault Confirmation
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A. Table of the circuit breakers used in this procedure:
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PANEL DESIGNATION IDENT. LOCATION
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121VU FUEL/FQI/CHANNEL/1 AND 2 8QT L26
B. Test
NOTE : The Preselector (5QT) is only operational (electrically powered)
____ when the refuel door is open. The Preselector Power On BITE tests are done at Preselector power on.
(1) Do an operational test of the fuel quantity preselector 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 preselector operates as specified in the operational test and the message PRESELECTOR 5QT is not shown on the FQIS STATUS page, no maintenance steps are necessary.
(4) If the preselector LEDs do not come on at preselector power-up or the message PRESELECTOR 5QT is shown on the FQIS STATUS page:
- go to Para. 4.A.
(5) If a preselector single LED (or segment of), the CKPT legend or the END legend fail to come on when the TEST switch (2QJ) is set to LTS:
- go to Para. 4.B.
(6) If the preselector LEDs, the CKPT and the END legends do not come on when the TEST switch (2QJ) is set to LTS:
- go to Para. 4.C.
(7) If the preselector PRESELECTED fuel quantity fails to change when the INC/DEC switch is set to INC or DEC:
- go to Para. 4.D.
「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 : ALL ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page B266
May 01/05 CES
4. Fault Isolation
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure - The Preselector LEDs Do Not Come On At Preselector Power-up OR The Message PRESELECTOR 5QT Is Shown On The FQIS STATUS Page
(1) Examine the LEDs on the IND-FUEL QTY MULTI TANK (6QT).
(a) If the LEDs on the IND-FUEL QTY MULTI TANK (6QT) are on, go to step (7).
NOTE : This shows the C/B-8QT is closed, the RL-14QU energized
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and 28VDC available.
(b) If the LEDs on the IND-FUEL QTY MULTI TANK (6QT) 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 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): 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 given in Para. 3.B.
_
「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 ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page B267
Aug 01/05 CES
(6) Examine bit 5R (TX FAULT/PRESELECTOR NOT POWERED).
(a) If bit 5R shows a 0 (is on/no TX fault), replace the PRESELECTOR-FUEL QUANTITY, MULTI TANK (5QT) (Ref. AMM TASK 28-42-21-000-001) and (Ref. AMM TASK 28-42-21-400-001).
(b) If bit 5R shows a 1 (is off/TX fault), go to step (7).
(7) Remove the preselector (5QT) (Ref. AMM TASK 28-42-21-000-001).
(8) Use a multimeter to do a test, at the preselector end connector (5QT-A), to make sure that the 28VDC is available between pin E (+ve) and pin D (-ve). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 FUEL 燃油3(42)
