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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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Quick Links

04/28/20

Message Overview:

Fault Message:

SDU/TX COAX

Fault Code:

23100F1SC

Associated CAS:

None

Reporting LRU: Satellite Data Unit
System Description: 23-13-00
Schematic Diagram: 23-13-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-13-09 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Satellite Data Unit (SDU) cannot transmit signals or transmits invalid signals to the High Power Amplifier (HPA) or the signals transmitted by the SDU to the HPA do not have the necessary properties for correct system operation.

Possible Causes:

  • Coaxial Cable
  • Satellite Data Unit (SDU) (A228)
  • Radio Frequency Unit (RFU) (A240)
  • Radio Frequency Attenuator (A231)
  • High Power Amplifier (HPA) (A229)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

AW 700-23-0584 - Honeywell SDU-600 Obsolescence

AW 700-23-0756 - MCS-7000 Obsolescence

SB 700-23-001 - Modification MCS-6000 SATCOM

SB 700-23-043 - Modification MCS-7000 SATCOM

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Satellite Data Unit AMM 23-13-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Satellite Data Unit AMM 23-13-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the High Power Amplifier AMM 23-13-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the High Power Amplifier AMM 23-13-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Radio Frequency Unit AMM 23-13-25-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Radio Frequency Unit AMM 23-13-25-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the RF Attenuator AMM 23-13-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the RF Attenuator AMM 23-13-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect SDU connector A228CP1 and RFU connector A240CP1. Perform a continuity check as follows:

    From To Result
    A228CP1-12 Ground
    A228CP1-12 Shield

    1. If there is continuity, repair defective co-axial cable as required and do close out.
    2. If there is no continuity, continue with next step.

  2. Perform a continuity check as follows:

    From To Result
    A228CP1-12 A240CP1-12

    1. If there is no continuity, repair defective co-axial cable as required and do close out.
    2. If there is continuity, continue with next step.

  3. Reconnect what was disconnected in the previous step. Disconnect RFU connector A240BP1 and RF Attenuator connector A231P1. Perform a continuity check as follows:

    From To Result
    A240BP1-71 Ground
    A240BP1-71 Shield

    1. If there is continuity, repair defective co-axial cable as required and do close out.
    2. If there is no continuity, continue with next step.

  4. Perform a continuity check as follows:

    From To Result
    A240BP1-71 A231P1-1

    1. If there is no continuity, repair defective co-axial cable as required and do close out.
    2. If there is continuity, continue with next step.

  5. Reconnect what was disconnected in the previous step. Disconnect RF Attenuator connector A231P2 and HPA connector A229AP1. Perform a continuity check as follows:

    From To Result
    A231P2-1 Ground
    A231P2-1 Shield

    1. If there is continuity, repair defective co-axial cable as required and do close out.
    2. If there is no continuity, continue with next step.

  6. Perform a continuity check as follows:

    From To Result
    A231P2-1 A229AP1-71

    1. If there is no continuity, repair defective co-axial cable as required and do close out.
    2. If there is continuity, continue with next step.

  7. A Time Domain Reflectometer (TDR) may also be used to check the integrity of the co-axial cable.

    1. If defects are found, repair as required and do close out.
    2. If no defects are found, continue with next step.

  8. Replace the RF Attenuator. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  9. Replace the RFU. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  10. Replace the HPA. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  11. Replace the SDU.
  12. Do close out.

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