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CABIN OUTLETS AND FREQUENCY CONVERTER FAILURES

Various faults can be observed:

• Single Cabin Power Outlet inoperative
• Grouped Cabin Outlets inoperative
• One or both Cabin Sides Outlets inoperative
• Frequency Converter Inoperative on GTSE

• Cockpit Circuit Breaker Panel (CCBP) (A35)
• Modular Cabinet Equipment 1 (A523)
• Modular Cabinet Equipment 2 (A524)
• 60Hz Power Converter 1 (A214)
• 60Hz Power Converter 2 (A267)
• Associated Wiring

Advisory Wire/Service Bulletin:

• SB 700-1A11-24-025 - Special Check/Modification - Electrical General - Replacement of Electrical Outlets

Forum Articles/Infoservice/Newsletter:

• 20170418_ForumNewsletter - Cabin Power Missing
• Forum_vol15_issue21_2018-10-17 - GFI Reset First Flight of the Day
• Cabin Electrical System Outlets troubleshooting guide
  

1. Check Cabin Outlet and Frequency Converter for inoperative or damage.

   1. If grouped cabin outlets inoperative, go to step 8.
   2. If one or both cabin sides outlets inoperative, go to step 12.
   3. If frequency converter inoperative on GTSE, go to step 12.
   4. If single cabin outlet inoperative, continue with next step.

2. For defective outlet, perform the operational test of the suspected electrical outlet per SMM task 24-26-80-710-801.

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

3. Verify that the aircraft complies with SB "700-1A11-24-025 - Special Check/Modification - Electrical General - Replacement of Electrical Outlets".

   1. If system checks are not good, apply condition as required and continue with next step.
   2. If system checks are good, continue with next step.

4. For Dado panel 2 Amp Circuit breaker trip, Unplug the device connected into the outlet and verify that the device complies with the power limitation (Refer to placard or cabin handbook).

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

5. Reset the 2 Amp CB (typically located below the cabin outlet) and perform test again.

   1. If the CB does not tripped, do close out.
   2. If fault remains, continue with next step.

6. Perform wiring checks for the Electrical outlet.

   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.

7. Replace the 2 Amp CB.

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

8. For Ground Fault Interrupter (GFI) reset, disconnect all devices that are connected to the outlets that are protected by the suspected GFI.
9. Reset the GFI while cabin power is ON.

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

10. Perform wiring checks for the GFI.
    NOTE: As per the supplemental Time Limits/Maintenance Checks (STLMC) manual, the GFI and cabin outlets must be tested every 15 months.

    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.

11. Replace GFI.

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

12. For oxygen mode, when the cabin Oxygen (O2) mode is active, a "Frequency converter inoperative" status message will be displayed on the Galley Touch Screen Equipment (GTSE).
13. As a reminder, when the O2 mode is active.
    EICAS advisory message "PASSENGER OXY ON" is displayed
    All cabin reading/table lights are set to ON
    Audio and video entertainment is muted
    The Frequency Converter is deactivated
    Upwash/Downwash lights are set to OFF

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

14. Reset a cockpit O2 switch.

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

15. For Frequency Converter Inoperative, In the Avionics bay compartment, verify that the Frequency Converter front panel switch is set to ON.

    1. If system checks are not good, apply condition as required and continue with next step.
    2. If system checks are good, continue with next step.

16. Verify that the 30 Amp CB (adjacent to the frequency converter) is not tripped.
    CAUTION: Total draw of all the outlets should never exceed 30A/3450W per frequency converter.
    NOTE: Bombardier does not recommend the use of more than one appliance in the galley at any given moment. For example, an electric kettle and a hot plate at the same time could bring the frequency converter to operate above its intended limitations. For aircraft with two (2) frequency converters, loads should be split between the two units, consult the SMM for detail on how to properly distribute the loads.

    1. If the CB does not tripped, do close out.
    2. If fault remains, continue with next step.

17. In the baggage compartment, access the ACPC upper assembly and verify that the Frequency Converter feeder CB "AC BUS 2" is set to IN.

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

18. Replace 60Hz Power Converter.
19. Do close out.