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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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11/10/23

Message Overview:

Message Name:

SDU / SCM DATA BUS FAULT

Message Code:

B3-661702

Associated CAS:

None

Reporting LRU: SAT 2X00
System Description: 23-00-00 - Communication
Schematic Diagram: SSM 23-15-00-101 - Satellite Communication (SATCOM)
SSM 23-15-00-102 - Satellite Communication (SATCOM)
Wiring Diagram: WM 23-15-01-1_001 - Sheet 1 - SATCOM Satellite Data Unit (SDU) - 20501 TO 20960
WM 23-15-09-1_001 - Sheet 1 - SATCOM High Gain Antenna - 20501 TO 20960

Message Description:

Satellite Communication (SATCOM)/Satellite Data Unit (SDU) is reporting a (SDU to Satellite Data Unit (SDU) Configuration Module (SCM)) or a (SCM to SDU) data bus fault.

Possible Causes:

  • Satellite Communication (SATCOM) Satellite Data Unit (SDU) (A82)
  • Satellite Communication (SATCOM)/Satellite Data Unit (SDU) Configuration Module (SCM) (A540)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-23-0419 - Satcom Data Unit (SDU-2200) Software Upgrade Available

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Covers and Plugs AMM 10-12-00-020-802
Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
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 SATCOM Satellite Data Unit (SDU) Configuration Module AMM 23-15-03-000-801
Installation of the SATCOM Satellite Data Unit (SDU) Configuration Module AMM 23-15-03-400-801
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic-Discharge Safety Precautions AMM 24-00-00-910-802
Connect Electrical Power to the Aircraft AMM 24-00-00-861-801
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL 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. Do wiring check of the RS-422 data buses from SDU connector A82BP1 to SCM connector A540P1. Repair/replace as required.

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

  3. Replace SCM.

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

  4. Replace SDU.
  5. Do close out.

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