TASK 28-15-00-810-812
Intercell Transfer Valves (Left And Right Rear) - Fail To Latch At Fuel Low
Level
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
_______________
- FQIC (3QT)
- RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP)
- aircraft wiring
- suppression diode across terminals X and Z of the RELAY 13QP
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific multimeter
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 28-15-00-710-002 Operational Check of Individual Transfer Valves to Ensure Valve Shaft Rotates Valve to Open Position AMM 28-42-34-000-001 Removal of the Fuel Quantity-Indicating Computer (FQIC) (3QT) AMM 28-42-34-400-001 Installation of the Fuel Quantity-Indicating Computer (FQIC) (3QT) ASM 28-15/01
3. Fault Confirmation
__________________
A. Do the Operational Test of the Intercell Transfer Valves (Ref. AMM TASK 28-15-00-710-002), (11 & 12QP ONLY).
NOTE : The intercell transfer valves (ICTVs) are motor driven and the
____ power for these circuits is derived from the main power. The ICTVs are immobilized on battery power.
「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 : 001-049, 051-099, 101-149, 151-199, ∞∞28-15-00∞∞∞∞∞∞∞∞∞∞Page 240
201-299, 401-499, Aug 01/05 CES
(1) Connect a multimeter to the RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP) as follows:
- the multimeter negative/low input to terminal Z
- the multimeter positive/high input to terminal X.
(2) Disconnect the lead from terminal 3 of RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP).
(3) After approximately 5 seconds to allow the valves to move, check that:
(a) The L and R XFR Valves show open on the FUEL System SD Page.
(b) The multimeter reads 28VDC.
(4) Reconnect the lead disconnected in (2) above.
(5) Check that:
(a) The L and R XFR Valves remain at open on the FUEL System SD Page.
(b) The multimeter reads 28VDC.
(6) Open C/Bs (1QP), A10 and (2QP), A11 at 121VU
(7) Close C/Bs (1QP), A10 and (2QP), A11 at 121VU
(8) On the FUEL System SD Page check that the Left and Right Transfer Valves return to the closed position.
4. Fault Isolation
_______________
A. If:
(1) The multimeter reads 28VDC during the period that the valves are open.
(2) The valves close when the lead is reconnected to terminal 3 in Para 3.A.(4).
(3) Check/replace the RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP) .
(4) Do the test given in Para 3.A.
(5) If the multimeter does not read 28VDC in Para 3.A.(3)(b) above do a wiring check (Ref. ASM 28-15/01) of the:
- aircraft wiring between the terminal X, of the RELAY 13QP and the pin C, of the connector AA, at ACTUATOR 11QP
- aircraft wiring between the terminal X, of the RELAY 13QP and the pin C, of the connector AA, at ACTUATOR 12QP
- aircraft wiring between the terminal Z, of the RELAY 13QP and the pin 10B, connector AB, at FQIC 3QT
「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 : 001-049, 051-099, 101-149, 151-199, ∞∞28-15-00∞∞∞∞∞∞∞∞∞∞Page 241
201-299, 401-499, Aug 01/05 CES
- suppression diode across terminals X and Z of the RELAY 13QP.
(6) Repair/replace all the unserviceable wiring, diodes, and connectors.
(7) Do the test given in Para 3.A.
(8) If the fault continues replace the FQIC (3QT) (Ref. AMM TASK 28-42-34-000-001) and (Ref. AMM TASK 28-42-34-400-001). 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1(37)
