The AC Power Center (ACPC) Solid State Power Converter (SSPC) power card has detected a failure with the initialization of the AC SSPCs, the control logic circuitry and/or the load.

• AC Power Center (ACPC) Solid-State Power Controller (SSPC) 7
• Left Aft Transfer Pump
• AC Power Center (ACPC) (A54)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

• If the pump is inoperative without CAIMS message and breaker is IN, check wires between FMQGC and EMS CDU 1 and 2
• If the breaker always tripping without CAIMS message, check for a short circuit between the pump and the SSPC #7

1. Swap SSPC 7 with SSPC 10 and monitor the R AFT BOOST PUMP.

   1. If system checks are good, replace SSPC 7 card and do close out.
   2. If fault remains, continue with next step.

2. Disconnect the L AFT TRANSFER PUMP connector B34P1 and remove the SSPC 7 card. Perform continuity check between the connections that follows:

   From	To	Result
   SSPC 7 P230-25	B34P1-A
   SSPC 7 P230-28	B34P1-B
   SSPC 7 P230-31	B34P1-C

   1. If there is no continuity, repair the defective wiring as required and do close out.
   2. If there is continuity, continue with next step.

3. Perform continuity check for open circuits between the connections that follows:

   From	To	Result
   SSPC 7 P230-25	Ground
   SSPC 7 P230-28	Ground
   SSPC 7 P230-31	Ground
   SSPC 7 P230-25	SSPC 7 P230-28
   SSPC 7 P230-25	SSPC 7 P230-31
   SSPC 7 P230-28	SSPC 7 P230-31

   1. If there is no continuity, replace L AFT TRANSFER PUMP and do close out.
   2. If there is continuity, continue with next step.

4. Disconnect connector A54P10 and repeat steps 3.

   1. If there is no continuity, repair aircraft interface wiring as required and do close out.
   2. If continuity, continue with next step.

5. Replace ACPC.
6. Do close out.