W DOC AIRBUS | TSM A320F

SLT LH WTB BLU (Blue) Solenoid 35CV or Open or Short Circuit to SFCC 1 SLT LH WTB GRN (Green) Solenoid 35CV or Open or Short Circuit to SFCC 2

TASK 27-81-00-810-822-A
SLT LH WTB BLU (Blue) Solenoid 35CV or Open or Short Circuit to SFCC 1 SLT LH WTB GRN (Green) Solenoid 35CV or Open or Short Circuit to SFCC 2

1. Possible Causes
  • WING TIP BRAKE [35CV]
  • A/C wiring between the SFCC 1 ARINC tray interface and the electrical connector
  • A/C wiring between the SFCC 2 ARINC tray interface and the electrical connector
  • WTB Solenoid Valve
  • 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
MULTIMETER - STANDARD
No specific
1
TESTER - INSULATION RESISTANCE
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 27-51-34-000-001
Removal of the SFCC
AMM 27-51-34-400-001
Installation of the SFCC
AMM 27-81-00-740-002
BITE Test of the Slat and Flap Control Computers (Slat System)
ASM 278106
ASM 278107
AMM 27-81-51-000-001
Removal of the Slat Wing-Tip Brake
AMM 27-81-51-000-004
Removal of the Solenoid Valve from the Slat Wing-Tip Brake (WTB)
AMM 27-81-51-400-001
Installation of the Slat Wing-Tip Brake
AMM 27-81-51-400-002
Installation of the Solenoid Valve to the Slat Wing-Tip Brake (WTB)
3. Fault Confirmation
Subtask 27-81-00-740-061-A
A. SFCC System BITE WTB Solenoid Test
   (1) Do a BITE test on the SFCC 1 (2) AMM 27-81-00-740-002.
   (2) If the fault data "LH WTB solenoid open circuit (disconnect)" or "LH WTB solenoid short circuit" comes into view:
  • Do the fault isolation.
4. Fault Isolation
Subtask 27-81-00-810-071-A
A. Procedure
   (1) Do not swap the SFCC's at this time.
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.
   (2) Disconnect the electrical connectors for the LH WING TIP BRAKE [35CV] solenoids.
   (3) Do a check of the A/C wiring between the SFCC 1 ARINC tray interface and the electrical connector 35CVA (Blue Solenoid) ASM 278106.
   (4) Do a check of the A/C wiring between the SFCC 2 ARINC tray interface and the electrical connector 35CVB (Green Solenoid) ASM 278107.
   (5) If there is no continuity, repair the wiring/interface.
   (6) If the A/C wiring is satisfactory, do a check of the circuit resistance and the circuit isolation of the fault indicated solenoid valve.
   (7) On the LH WTB, use the MULTIMETER - STANDARD to do a check of the resistance between:
  • SFCC1 - 35CVA = LH Blue solenoid pins A and U ASM 278106
  • SFCC2 - 35CVB = LH Green solenoid pins A and B ASM 278107.
     (a) The resistance for the solenoid valve:
  • P/N 667C0000-02 must be between 71 Ohms and 84 Ohms.
  • P/Ns 903A0000-01, 1106A0000-01 and 1111A0000-01 must be between 53 Ohms and 60 Ohms.
  • P/N 5751A0000-01 must be between 53 Ohms and 60 Ohms.
   (8) On the LH WTB Blue solenoid, do a check for circuit isolation as follows:
     (a) Connect the pins A and B together.
     (b) Connect one test lead of the TESTER - INSULATION RESISTANCE to the pins AB and the other test lead to pin C.
     (c) Supply a test signal for 5 seconds and read the shown resistance value.
     (d) The resistance value must be more than 100 Megohms.
   (9) For the LH WTB Green solenoid, do steps (8)(a) thru (8)(d) again.
   (10) If the WING TIP BRAKE [35CV] does not give the correct results for one of the two tests (Refer to steps (7) and (8) or (9)):
   (11) If the fault continues, replace the WING TIP BRAKE [35CV]
AMM 27-81-51-000-001 and AMM 27-81-51-400-001.
   (12) Interchange SFCC 1 and SFCC 2
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
     (a) Get access to the SLT ON GROUND FAULTS page and do a check of the ground log.
     (b) If the fault moves with the SFCC 1(2):
       1 Install the serviceable SFCC to its initial position.
       2 Replace the defective SLAT/FLAP CONTR.COMP. [21CV] or SLAT/FLAP CONTR.COMP. [22CV] .
     (c) If the fault does not move to the other SFCC:
       1 Install the SFCCs to their initial positions.
       2 Do the next step.
   (13) Do the System BITE test as given in Para. 3.A.(1).
   (14) Set the MCDU to MENU MODE and get access to the SLT ON GROUND FAULTS page. Make sure that there are no faults.
5. Close-up
Subtask 27-81-00-942-071-A
A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 27-81-00-860-072-A
B. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:27:48 UTC
"WTRUIB" 2025