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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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02/26/21

Message Overview:

Message Name:

NO ISI-1 OUTPUT TO DCU

Message Code:

B3-007003

Associated CAS:

None

Reporting LRU: ISI
System Description: 34-12-00
Schematic Diagram: 34-12-00
Wiring Diagram: 34-12-01

Message Description:

Integrated Standby Instrument output (BUS ISI-1) is reported missing by the Data Concentrator Unit.

Possible Causes:

  • Integrated Standby Instrument (ISI) (A90)
  • Junction Box 3 (JB3)
  • Data Concentrator Unit (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB3 AMM 24-63-09-000-802
Installation of the Junction Box JB3 AMM 24-63-09-400-802
Functional Test of Junction Box JB3 AMM 24-63-09-720-801
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Removal of the Integrated Standby Instrument AMM 34-12-01-000-801
Installation of the Integrated Standby Instrument AMM 34-12-01-400-801
Functional Test of the Integrated Standby Instrument AMM 34-12-01-720-801
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. Do wiring check of the ISI-1 ARINC bus from Junction Box #3 Test Points (TP58-ARINC Hi / TP71-ARINC Lo) to DCU connectors A14FP1. Repair/replace as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Replace DCU.
  3. Do close out.

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