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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:

INTERNAL FAULT

Message Code:

B3-007004

Associated CAS:

None

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

Message Description:

Internal fault detected by ISI.

Possible Causes:

  • Integrated Standby Instrument (ISI) (A90)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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. In Maintenance Main Menu, select LRU INDEX/OPERATIONS and check ISI Label 350.

    1. If ISI label 350 bit 27 is set to 0 (ISI Powered), go to step 5.
    2. If ISI label 350 bit 27 is set to 1 (ISI Not Powered), continue with next step.

  2. Ensure STBY INST circuit breaker CB2-C6 is pushed in.

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

  3. On pedestal, cycle the STBY INST Battery switch from OFF position to ON. Ensure OFF PBA is off.

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

  4. Verify ISI power 28 VDC is present on pin D of A90P1.

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

  5. Replace ISI.
  6. Do close out.

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