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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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02/23/21

Message Overview:

Message Name:

TOP/PORT BSU

Message Code:

B3-007981

Associated CAS:

None

Reporting LRU: SAT 2X00
System Description: 23-15-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Fault Triggered by one of: SSM of Top/port BSU Maint Wd indicates Fail Warn, BSU bit of Top/Port BSU Maint Wd indicates T/P BSU fault and SSM of BSU Wd not in Test, BSU SSM shows Self-test after 4 Min after initiating.

Possible Causes:

  • Sign Status Matrix (SSM)
  • Beam Steering Unit (BSU)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. LRU = SRT1 SAT 2000
  2. ATA Chapter = 23-00
  3. Message# = 6
  4. Comp Id = A082
  5. Message = TOP/PORT BSU
  6. Fault Logged = AIR,TAXI
  7. Status = FAILED/WIRING
  8. Message Type = Fault Message
  9. CAS/Cockpit =
  10. {Term Definitions}

    1. SRT1-4 XX 350 00 EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 350: 19;TOP/PORT BSU

  11. Equ Descr = Fault Triggered by one of : SSM of Top/port BSU Maint Wd indicates Fail Warn, BSU bit of Top/Port Bsu Maint Wd indicates T/p BSU fault and SSM of BSU Wd not in Test, BSU SSM shows Self Test after 4 Min after initiating.
  12. Equ ID# = B3-007981

Quick Links:

Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Fault Triggered by one of: SSM of Top/port BSU Maint Wd indicates Fail Warn, BSU bit of Top/Port BSU Maint Wd indicates T/P BSU fault and SSM of BSU Wd not in Test, BSU SSM shows Self-test after 4 Min after initiating.
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