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 recepticals
- the cable looms next to the actuator.
NOTE : Left Wing Wire Routing (Ref. AWM 94-05-02).
____
(2) Repair/replace all the unserviceable wiring and connectors.
(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 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/EARTH | E | -------------------------------------------------
「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 ∞∞28-24-00∞∞∞∞∞∞∞∞∞∞Page 249
Feb 01/98 CES NOTE : The correct operation of the LP fuel valve symbol on
____ the FUEL system display page shows that the ground/earth is available on pin E, of connector 9QG-A.
Also, if the ground/earth 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/EARTH | E | -------------------------------------------------
NOTE : If the ground/earth 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), (Ref. AMM
_ TASK 28-24-51-000-001), and (Ref. AMM TASK 28-24-51-400-001).
2 If the fault continues:
_
- replace the VALVE-LP FUEL, ENG 1 (12QM), (Ref. AMM TASK 28-24-41-000-001), and (Ref. AMM TASK 28-24-41-400-001).
(b) Not correct as given in the tables above:
- do a check of the RELAY-ENG/MASTER 1 (11QG) 103VU126 and replace if necessary.
(6) Do the test given in Para. 3.A.
「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 ∞∞28-24-00∞∞∞∞∞∞∞∞∞∞Page 250
Feb 01/98 CES
(7) If the fault continues do a wiring check (Ref. AWM 28-24-01) of the:
- aircraft wiring (motor 1 open supply) between the RELAY-ENG/MASTER1 (11QG), terminal A3, and the electrical supply connector 9QG-A, pin A
- aircraft wiring (motor 2 open supply) between the RELAY-ENG/MASTER1 (11QG), terminal B3, and the electrical supply connector 9QG-B, pin
A.
(8) Repair all the unserviceable wiring and connectors.
(9) Do the test given in Para. 3.A.
「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 ∞∞28-24-00∞∞∞∞∞∞∞∞∞∞Page 251
Feb 01/98 CES
TASK 28-24-00-810-813
Fuel LP Fuel Valve Engine 1 Closes Slowly, Opens Correctly
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
WARNING : WHEN YOU WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST EQUIPMENT
_______ THAT IS APPROVED TO EUROPEAN SPECIFICATION EN50-020. THE USE OF 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) 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2(52)
