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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:

LO NOISE AMP UNIT/WIRING

Fault Code:

231000DSC

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:

Diplexer/The Low Noise Amplifier (LNA) has been marked failed by the Satellite Communication (SATCOM) system.

Possible Causes:

  • Antenna Control Unit (ACU) (A227)
  • Diplexer/Low Noise Amplifier (LNA) (A230)
  • 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 Diplexer/Low Noise Amplifier AMM 23-13-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Diplexer/Low Noise Amplifier AMM 23-13-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Antenna Control Unit AMM 23-13-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Antenna Control Unit AMM 23-13-21-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect LNA connector A230P4 and ACU connector A227P2. Perform a continuity check as follows:

    From To Result
    A230P4-G Ground
    A230P4-K Ground
    A230P4-B Ground
    A230P4-H Ground
    A230P4-J Ground
    A230P4-A Ground

    1. If there is continuity, repair defective wiring 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
    A230P4-G A227P2-N
    A230P4-K A227P2-P
    A230P4-B A227P2-m
    A230P4-H A227P2-W
    A230P4-J A227P2-X
    A230P4-A A227P2-k

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

  3. Replace the LNA. Is the fault still present?

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

  4. Replace the ACU.
  5. Do close out.

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