W DOC AIRBUS | TSM A320F

FLP LH WTB BLU Solenoid 33CV or Open or Short Circuit to SFCC 1 FLP LH WTB YEL Solenoid 33CV or Open or Short Circuit to SFCC 2

TASK 27-51-00-810-836-A
FLP LH WTB BLU Solenoid 33CV or Open or Short Circuit to SFCC 1 FLP LH WTB YEL Solenoid 33CV or Open or Short Circuit to SFCC 2

1. Possible Causes
  • WTB Solenoid Valve
  • WING TIP BRAKE [33CV]
  • aircraft wiring
  • SLAT/FLAP CONTR.COMP. [21CV]
  • SLAT/FLAP CONTR.COMP. [22CV]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
MEGOHMMETER 100 MOHMS - MEASURING VOLTAGE 45 VDC
No specific
1
MULTIMETER - STANDARD
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 27-51-00-740-002
BITE Test of the Slat and Flap Control Computers (Flap System)
ASM 275106
ASM 275107
AMM 27-51-34-000-001
Removal of the SFCC
AMM 27-51-34-400-001
Installation of the SFCC
AMM 27-51-51-000-001
Removal of the Flap Wing-Tip Brake
AMM 27-51-51-000-002
Removal of the Solenoid Valves of the Flap Wing-Tip Brake (WTB)
AMM 27-51-51-400-001
Installation of the Flap Wing-Tip Brake
AMM 27-51-51-400-002
Installation of the Solenoid Valves of the Flap Wing-Tip Brake (WTB)
3. Fault Confirmation
Subtask 27-51-00-740-067-A
A. Test
   (1) Do a BITE test on the SFCC 1 or SFCC 2, identified in the failure message AMM 27-51-00-740-002.
   (2) If the failure message LH WTB SOLENOID OPEN CIRCUIT (DISCONNECT) or LH WTB SOLENOID SHORT CIRCUIT is shown, do the fault isolation procedure in Para. 4.A.
4. Fault Isolation
Subtask 27-51-00-810-086-A
A. Procedure
CAUTION: DO NOT SWAP FLIGHT CONTROL COMPUTERS. IF THERE IS A SHORT CIRCUIT, YOU WILL CAUSE DAMAGE TO A SERVICEABLE COMPUTER WHEN YOU SWAP THEM.
   (1) Disconnect the applicable electrical connector attached to the wing tip brake (33CV) solenoid-valve, identified in the failure message:
  • For the LH WTB Blue hydraulic-system solenoid, disconnect the connector 33CV-A
  • For the LH WTB Yellow hydraulic-system solenoid, disconnect the connector 33CV-B.
   (2) Use a MULTIMETER - STANDARD to do a check of the resistance between pin A and pin B ASM 275106 or ASM 275107:
  • The resistance for the solenoid valve 667C0000-02 must be between 71 ohms and 84 ohms
  • The resistance for the solenoid valves 903A0000-01, 1106A0000-1 and 1111A0000-01 must be between 53 ohms and 60 ohms
  • The resistance for the solenoid valve 5751A0000-01 must be between 53 ohms and 60 ohms.
   (3) Connect the pins A and B together. Use a MEGOHMMETER 100 MOHMS - MEASURING VOLTAGE 45 VDC or a 50VDC +5VDC/-5VDC Isolation Tester to do an isolation test between pins AB and pin C (ground):
  • The resistance value must be more than 100 Megohms.
   (4) Connect the connector disconnected in step (1).
   (5) If the solenoid electrical checks are correct, go to step (7).
   (6) If the solenoid electrical checks are not correct:
   (7) If the fault continues:
   (8) If the fault continues, do a check and repair the aircraft wiring between:
  • The applicable SFCC 1 (2) ARINC tray interface
  • The applicable electrical connector 33CV-A or 33CV-B ASM 275106 or ASM 275107.
   (9) Interchange SFCC 1 and SFCC 2 AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
     (a) If the fault does not move to the other SFCC:
  • Install the SFCCs in their initial positions.
     (b) If the fault moves to the opposite SFCC position:
       1 Install the serviceable SFCC in its initial position.
       2 Replace the unserviceable SLAT/FLAP CONTR.COMP. [21CV] or SLAT/FLAP CONTR.COMP. [22CV] .
       3 Do the test in Para. 3.A.
       4 Set the MCDU to MENU MODE and get access to the FLP ON GROUND FAULTS page.
Make sure that the ground log is empty.
[Rev.8 from Aug 2018] 2026.04.04 04:27:39 UTC
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