(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:
- maintenance steps are not necessary.
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.
4. Fault Isolation
_______________
A. If the ENG 1 LP fuel valve opens and closes slowly. NOTE : This procedure is for slow transit times in BOTH directions ONLY.
____ If the transit time from closed to open is 4 seconds or more, and the transit time from open to closed is 4 seconds or more, this shows that (for a single failure case):
- the fault is an item that is common to both the actuator open and close supply lines
- an unserviceable actuator
- an unserviceable valve (partially seized).
(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) Examine the C/B-FUEL/LP VALVE/MOT 1/ENG 1 (1QG) (49VU210)
(4) Reset the C/B if found tripped in Step (3).
(5) Examine the C/B-FUEL/LP VALVE/MOT 2/ENG 1 (3QG) (121VU212)
(6) Reset the C/B if found tripped in Step (5).
(7) Do the test given in Para. 3.A.
(8) If the fault continues:
(a) Disconnect the electrical supply connector 9QG-A from the ACTUATOR-LP FUEL VALVE, ENG 1 (9QG).
1 Make sure the ENG/MASTER 1 (3KC) switch is set to OFF.
_ 2 Using a multimeter do a check to see if 28VDC is available
_ between the pins as shown in the table that follows.
「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 237
Feb 01/98 CES
-------------------------------------------------| SIGNAL LINE | CONNECTOR 9QG-A | |-----------------------------|-------------------| | MOTOR 1 CLOSE 28VDC SUPPLY | C | | MOTOR 1 GROUND/EARTH | E | -------------------------------------------------
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.
3 Set the ENG/MASTER 1 (3KC) switch to ON.
_
4 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 | -------------------------------------------------
5 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 wiring check (Ref. AWM 28-24-01) of the aircraft wiring
_ (motor 2/ground/earth) between the ACTUATOR-LP FUEL VALVE, ENG 1 free connector 9QG-B, pin E and the ground/earth point 4003VN(522STA540) to make sure a ground/earth is on pin E of connector 9QG-B.
2 Set the ENG/MASTER 1 (3KC) switch to OFF.
_
3 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 CLOSE 28VDC SUPPLY | C | | MOTOR 2 GROUND/EARTH | E | -------------------------------------------------
4 Set the ENG/MASTER 1 (3KC) switch to ON.
_
5 Do a check to see if 28VDC is available between the pins as
_
shown in the table that follows.
「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 238
Feb 01/98 CES
-------------------------------------------------
| SIGNAL LINE | CONNECTOR 9QG-B |
|-----------------------------|-------------------|
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本文链接地址：A320 Trouble Shooting Manual 排故手册 FUEL 燃油2(47)
