Fault Message:

ADC2 429/ SFCU/ WIRING

Fault Code:

2750005STD

Associated CAS:

SLAT-FLAP BIT
(Advisory)

Slat/Flap Control Unit (SFCU) does not receive input from Micro Air-Data Computer (MADC 2) or the data is not correct.

• Micro Air-Data Computer (MADC) 2 (A28)
• Junction Box (JB3) PCB4
• Junction Box (JB6) PCB4
• Slat/Flap Control Unit (SFCU) 1 (A124)
• Slat/Flap Control Unit (SFCU) 2 (A95)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-45-0065 - CAIMS Nuisance Fault Messages

Forum Articles/Infoservice/Newsletter: None

Performing a SLAT FLAP RESET on the EMS CDU may clear this fault.

NOTE: Wait at least one minute after SFCU reset to allow self test to run.

This fault may be posted due to the SFCU powering up prior to the LGECU. This fault will clear automatically when the LGECU powers up and provides an input.

1. On the EMS CDU, select CTRL function and SLAT/FLAP RESET.
   NOTE: Wait at least one minute after SFCU reset to allow self-test to run.
2. Cycle power to the ADC 1.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

3. Confirm SFCU 1 and SFCU 2 report the same fault.

   1. If reporting the same fault, go to step 6.
   2. If not reporting the same fault, continue with next step.
      NOTE:

      1. CPC and SFCU 2 are getting the ADC 1 Bus 3 information.
      2. SPC, GPS and SFCU 1 are getting the ADC 1 Bus 4 information.

4. Reseat SFCUs.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

5. Perform wiring checks between SFCU 1 and JB3, SFCU 2 and JB6.
   Reported by SFCU 1:

   From	To	Result
   A124AP1-59	JB3FP1-8H
   A124AP1-72	JB3FP1-8J

   NOTE: The wiring check can also be do through the test point on the PC Board 4 inside the JB3.

   For 93 pins Test point Connector (JB3 PCB5 P/N 00514-0069-0002)
   TP-90	High
   TP-91	Low
   For 96 pins Test point Connector (JB3 PCB5 P/N 00514-0069-0001)
   TP-93	High
   TP-92	Low

   NOTE: The test point’s references inside the junction boxes in the wiring diagram are not necessarily accurate. (Reference CMM24-00-01)
   Reported by SFCU 2:

   From	To	Result
   A95AP1-59	JB6FP1-7H
   A95AP1-72	JB6FP1-7J

   NOTE: The wiring check can also be do through the test point on the PC Board 5 inside the JB3.

   For 93 pins Test point Connector (JB3 PCB5 P/N 00514-0069-0002)
   TP-4	High
   TP-35	Low
   For 96 pins Test point Connector (JB3 PCB5 P/N 00514-0069-0001)
   TP-4	High
   TP-36	Low

   NOTE: The test point’s references inside the junction boxes in the wiring diagram are not necessarily accurate. (Reference CMM24-00-01)

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

6. Swap MADC 2 with MADC 1.

   1. If system checks are good, replace MADC 2 and do close out.
   2. If fault remains, continue with next step.

7. Perform wiring checks between MADC 2 and JB3 (SFCU 1) or MADC 2 and JB6 (SFCU 2) corresponding to the bus that is reporting fault.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

8. Replace JB3 PCB4 (SFCU 1) or JB6 PCB4 (SFCU 2).

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

9. Replace Right Wing Flap resolver.
10. Do close out.