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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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02/24/21

Message Overview:

Message Name:

NO SATCOM BUS OUTPUT

Message Code:

B3-664346

Associated CAS:

None

Reporting LRU: SAT 2X00
System Description: 23-00-00
Schematic Diagram: 23-15-00 (POST SB 350-23-012)
23-15-00 (POST SB 350-23-013)
Wiring Diagram: 23-15-01

Message Description:

SATCOM data is not being received by L IOC, L CDU.

Possible Causes:

  • SATCOM Satellite Data Unit (SDU)
  • Circuit Breaker
  • Current Thermal Sensor - RT06
  • Remote-Control Circuit Breaker (RCCB) Contactors (K144)
  • Right DC Power Center (R DCPC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the SATCOM Satellite Data Unit (SDU) AMM 23-15-01-000-801
Installation of the SATCOM Satellite Data Unit (SDU) AMM 23-15-01-400-801
Removal of the DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
Removal of the Current Thermal Sensor AMM 24-61-51-000-801
Installation of the Current Thermal Sensor AMM 24-61-51-400-801
Removal of the Remote Control Circuit Breaker (RCCB) Contactors AMM 24-61-61-000-801
Installation of the Remote Control Circuit Breaker (RCCB) Contactors AMM 24-61-61-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset SATCOM (CB4-D2) circuit breaker.

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

  2. Confirm presence of the 28 VDC and grounds at SDU connector A82CP1.

    1. If 28 VDC and grounds are present, go to step 9.
    2. If 28 VDC is not present, go to next step 4.
    3. If grounds are not present, continue with next step.

  3. Repair/replace, as required, the wiring and/or the ground stud.

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

  4. Do the wiring check between R DCPC connector A36P4 and SDU connector A82CP1. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Confirm proper operation of the SATCOM (CB4-D2) control circuit breaker by measuring the presence of a ground at R DCPC connector A36AP4 - Pin 8. Repair/replace as required.

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

  6. Swap Remote-Control Circuit Breaker (RCCB) Contactors (K144 with K108).

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

  7. Swap Current Thermal Sensors (RT06 with RT04).

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

  8. Replace R DCPC.

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

  9. Replace SDU.
  10. Do close out.

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