Message Name:

ACPC APULC-EPLC CONTACTOR-K1 FAILED

Message Code:

2451340ACP

Associated CAS:

ELEC SYS FAULT
(Advisory)

The AC Power Center (ACPC) Primary Logic Cards (PLC) detects a discrepancy between coil drive status and auxiliary contact status of the Contactor K1.

• AC Power Center (ACPC) Contactor (K1)
• AC Power Center (ACPC) Mother Board
• Electromagnetic Interference (EMI) Filter
• AC Power Center (ACPC) TB202
• AC Power Center (ACPC) TB201
• AC Power Center (ACPC) Electronic Module 1 (EM1)
• AC Power Center (ACPC) Electronic Module 3 (EM3)
• AC Power Center (ACPC) Primary Logic Card (PLC) 1
• AC Power Center (ACPC) Primary Logic Card (PLC) 2
• AC Power Center (ACPC) Primary Logic Card (PLC) 3
• AC Power Center (ACPC) (A54)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

•  If this CAIMS Fault Code is posted in association with the External AC not available reference the Observed Fault 244OBS001 UNABLE TO POWER AIRCRAFT WITH EXTERNAL AC.

1. Get access to the ACPC contactor K1 and disconnect contactor K1 connector P502.
2. Confirm that the wires terminated at K1 contactor A3, B3, & C3 (small wires) are terminated correctly. Do a continuity check as follows. Are results as expected?
   

   From	To	Expected Result	Result
   P503-7	K1-A3	Continuity
   P503-8	K1-B3	Continuity
   P503-9	K1-C3	Continuity

   

3. Perform a continuity check as follows:

   From	To	Expected Result	Result
   J502-E	J502-F	Continuity
   J502-R	J502-S	Open

   1. If the results are not as seen in the table above, replace K1 and do close out.
   2. If the results are as seen in the table above, continue with next step.

4. In the cockpit, turn the BATT MSTR SW to ON.
5. Perform a check for 28 VDC as follows:

   From	To	Result
   P502-C	Ground

   1. If there is 28 VDC, go to step 8.
   2. If there is no 28 VDC, continue with next step.

6. Perform a check for 28 VDC at Electronic module 1 (EM 1) P407-7.

   1. If there is 28 VDC, replace the ACPC and do close out.
   2. If there is no 28 VDC, continue with next step.

7. Perform a 28 VDC voltage check at EM1 connector P407-12.

   1. If there is 28 VDC, replace EM 1 and do close out.
   2. If there is no 28 VDC, replace the AC and DC power converter card and do close out.

8. Set the BATT MSTR SWITCH to OFF.
9. Perform a continuity check as follows:

   From	To	Result
   P502-S	Ground
   P502-F	Ground

   1. If there is no continuity, check TB201-2 and repair as required and do close out.
   2. If there is continuity, continue with next step.

10. Remove PLC 1, PLC 2 and PLC 3.
11. Perform a continuity check as follows:

    From	To	Result
    P502-R	Ground
    P502-E	Ground
    P502-D	Ground

    1. If there is continuity, go to step 16.
    2. If there is no continuity, continue with next step.

12. Re-install PLC 1 and PLC 2.

    1. If system checks are good, replace PLC 3 and do close out.
    2. If fault remains, continue with next step.

13. Reinstall PLC 3 and remove PLC 1.

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

14. Reinstall PLC 1 and remove PLC 2.

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

15. Replace K1.

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

16. Replace ACPC.
17. Do close out.