W DOC AIRBUS | TSM A320F

Fuel LP Fuel Valve Engine 1 Opens Slowly, Closes Correctly

TASK 28-24-00-810-812-A
Fuel LP Fuel Valve Engine 1 Opens Slowly, Closes Correctly

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: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
1. Possible Causes
  • ACTUATOR-LP FUEL VALVE, ENG 1 [9QG]
  • VALVE-LP FUEL, ENG 1 [12QM]
  • RELAY-ENG/MASTER 1 [11QG]
  • aircraft wiring
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
MULTIMETER - STANDARD
 B. Referenced Information
REFERENCE
DESIGNATION
ESPM 2053210
AMM 26-12-00-00-
AMM 26-21-00-00-
ASM 262102
AMM 28-24-00-00-
ASM 282401
AWM 282401
AMM 28-24-41-000-001
Removal of the LP Fuel Valve
AMM 28-24-41-400-001
Installation of the LP Fuel Valve
AMM 28-24-51-000-001
Removal of the LP Fuel Valve Actuator
AMM 28-24-51-400-001
Installation of the LP Fuel Valve Actuator
AMM 76-12-00-00-
ASM 761201
AWM 940502
TSM TASK 28-24-00-03
ENGINE LP FUEL SHUT OFF - TASK SUPPORTING DATA
3. Fault Confirmation
Subtask 28-24-00-710-058-A
A. Test
   (1) On the ENG/APU FIRE PANEL (1WD) located on the overhead panel 20VU, make sure that the ENG 1 FIRE PUSH pushbutton switch (P/BSW) is in the closed and guarded position.
   (2) On the ECAM Control Panel 11VU, push (in) the FUEL P/BSW to get the FUEL system page on the ECAM lower display unit (DU).
   (3) Make sure the ENG/MASTER 1 (3KC) switch (panel 115VU) is set to OFF.
   (4) On the FUEL system page make sure the ENG 1 LP fuel valve symbol shows that the valve is closed (amber crossline).
   (5) Make a note of the valve transit time for the following actions:
NOTE: The LP fuel valve symbol shows a 45 degree amber line while in transit.
     (a) Set the ENG/MASTER 1 (3KC) switch (panel 115VU) to ON, and immediately observe the ENG 1 LP fuel valve symbol on the FUEL system page.
     (b) Make sure the ENG 1 LP fuel valve symbol changes to open (green in-line).
   (6) Make a note of the valve transit time for the following actions:
NOTE: The LP fuel valve symbol shows a 45 degree amber line while in transit.
     (a) Set the ENG/MASTER 1 (3KC) switch (panel 115VU) to OFF, and immediately observe the ENG 1 LP fuel valve symbol on the FUEL system page.
     (b) Make sure the ENG 1 LP fuel valve symbol changes to closed (amber crossline).
   (7) If the ENG 1 LP fuel valve:

  • transit time from closed to open is 2 seconds (and the transit time from open to closed is 2 seconds), no troubleshooting work steps are necessary

  • opens slowly and closes correctly, do Para. 4.A.
NOTE: The above time of 2 seconds is correct for an aircraft with a nominal supply voltage of 28VDC. If the 28VDC supply voltage is low or in ambient conditions of extreme cold the transit time of the actuator will be greater.
NOTE: You can get more data from the:
4. Fault Isolation
Subtask 28-24-00-810-060-A
A. Procedure
NOTE: This procedure is for a slow transit time in the OPEN direction ONLY.

If the transit time from closed to open is 4 seconds or more, and the transit time from open to closed is 2 seconds, this shows that (for a single failure case):
  • the fault is an item that is unique to an actuator open line
  • an unserviceable actuator.
   (1) Examine for obvious signs of damage the items that follow:
  • the actuator supply cables and end connectors
  • the actuator electrical receptacles
  • the cable looms next to the actuator.
NOTE: Left Wing Wire Routing AWM 940502.
   (2) Repair (or replace) all the unserviceable wiring and connectors ESPM 2053210.
   (3) Do the test given in Para. 3.A.
   (4) If the fault continues:
     (a) Disconnect the electrical supply connector 9QG-A from the ACTUATOR-LP FUEL VALVE, ENG 1 (9QG).
       1 Set the ENG/MASTER 1 (3KC) switch to ON.
       2 Using a MULTIMETER - STANDARD do a check to see if 28VDC is available between the pins as shown in the table that follows.
SIGNAL LINE
CONNECTOR 9QG-A
MOTOR 1 OPEN 28VDC SUPPLY
A
MOTOR 1 GROUND
E
NOTE: The correct operation of the LP fuel valve symbol on the FUEL system display page shows that the ground is available on pin E, of connector 9QG-A.

Also, if the ground was missing from the pin E, of connector 9QG-A, motor 1 of the actuator would not operate. In such a case the valve would move slowly in both directions powered by motor 2 only.
       3 Reconnect the electrical supply connector 9QG-A to the ACTUATOR-LP FUEL VALVE, ENG 1 (9QG).
     (b) Disconnect the electrical supply connector 9QG-B from the ACTUATOR-LP FUEL VALVE, ENG 1 (9QG).
       1 Do a check to see if 28VDC is available between the pins as shown in the table that follows.
SIGNAL LINE
CONNECTOR 9QG-B
MOTOR 2 OPEN 28VDC SUPPLY
A
MOTOR 2 GROUND
E
NOTE: If the ground is missing from the pin E, of connector 9QG-B, motor 2 of the actuator would not operate. In such a case the valve would move slowly in both directions powered by motor 1 only.
   (5) If the supplies are:
     (a) Correct as given in the tables above:
       1 Replace the ACTUATOR-LP FUEL VALVE, ENG 1 [9QG] AMM 28-24-51-000-001 and AMM 28-24-51-400-001.
       2 If the fault continues:
     (b) Not correct as given in the tables above:
  • do a check of the RELAY-ENG/MASTER 1 [11QG] and replace, if necessary.
   (6) Do the test given in Para. 3.A.
   (7) If the fault continues:
     (a) Do a wiring check AWM 282401 of the aircraft wiring between:
  • the RELAY-ENG/MASTER 1 (11QG), terminal A3, and the electrical supply connector 9QG-A, pin A (motor 1 open supply)
  • the RELAY-ENG/MASTER 1 (11QG), terminal B3, and the electrical supply connector 9QG-B, pin A (motor 2 open supply).
     (b) Repair all the unserviceable wiring and connectors ESPM 2053210.
     (c) Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:28:42 UTC
"WTRUIB" 2025