3. Fault Confirmation
__________________
A. Procedure.
NOTE : You can get more data from the:
____
- Aircraft Maintenance Manual (AMM) Chapters 26-12-00, 26-21-00, 28-24-00, and 76-12-00 - Description and Operation (D and O)
- Trouble Shooting Manual (TSM) - Task Supporting Data (Ref. P. Block 301)
- Aircraft Schematic Manual (ASM) (Ref. ASM 26-21/02), (Ref. ASM 28-24/01), and (Ref. ASM 76-12/01).
(1) On the ENG/APU FIRE PANEL (1WD) located on the overhead panel 20VU, make sure that the ENG 2 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 2 (2KC) switch (panel 115VU) is set to OFF.
(4) On the FUEL system page make sure the ENG 2 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 2 (2KC) switch (panel 115VU) to ON, and immediately observe the ENG 2 LP fuel valve symbol on the FUEL system page.
(b) Make sure the ENG 2 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 2 (2KC) switch (panel 115VU) to OFF, and immediately observe the ENG 2 LP fuel valve symbol on the FUEL system page.
(b) Make sure the ENG 2 LP fuel valve symbol changes to closed (amber crossline).
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(7) If the ENG 2 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
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A. If the ENG 2 LP fuel valve opens slowly, and closes correctly.
NOTE : This procedure is for a slow transit time in the OPEN direction
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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 recepticals
- the cable looms next to the actuator.
NOTE : Right Wing Wire Routing (Ref. AWM 94-06-02).
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(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 10QG-A from the ACTUATOR-LP FUEL VALVE, ENG 2 (10QG).
1 Set the ENG/MASTER 2 (2KC) 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 10QG-A | |-----------------------------|-------------------| | MOTOR 1 OPEN 28VDC SUPPLY | A | | MOTOR 1 GROUND/EARTH | E | -------------------------------------------------
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