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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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04/27/20

Message Overview:

Fault Message:

DATA BUS FROM RFU TO SDU/WIRING

Fault Code:

2310067SC

Associated CAS:

None

Reporting LRU: Satellite Data Unit (SDU)
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 Radio Frequency Unit (RFU) databus to the Satellite Data Unit (SDU) is inactive.

Possible Causes:

  • Radio Frequency Unit (RFU) (A240)
  • Satellite Data Unit (SDU) (A228)
  • 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 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Make sure the SATCOM FREQ UNIT circuit breaker is set to IN on the cockpit Circuit Breaker Panel (CCBP).

    1. If the circuit breaker is set to IN, continue with next step.
    2. If the circuit breaker is not set to IN, set it to in and do close out.

  2. Disconnect RFU connector A240CP1. Perform a 115 VAC voltage check as follows:

    From To Result
    A240CP1-1 A240CP1-7

    1. If there is 115 VAC, continue with next step.
    2. If there is no 115 VAC, investigate wiring interface and power source (AC BUS 1) and do close out.

  3. Disconnect SDU connector A228BP1 and RFU connector A240AP1. Perform a continuity check as follows:

    From To Result
    A228BP1-E9 Ground
    A228BP1-F9 Ground
    A228BP1-E9 A228BP1-F9

    1. If there is continuity, repair defective wiring 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
    A228BP1-E9 A240AP1-A1
    A228BP1-F9 A240AP1-B1

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

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

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

  6. Replace the SDU.
  7. Do close out.

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