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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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Quick Links

02/25/21

Message Overview:

Message Name:

STBY INST BATT TEST FAIL

Message Code:

B3-271557

Associated CAS:

STBY INST BATT FAULT
(Advisory)

Reporting LRU: STBY INST BATT
System Description: 24-32-00
Schematic Diagram: 24-32-00
Wiring Diagram: 24-32-05

Message Description:

Standby Instrument Battery has failed.

Possible Causes:

  • Standby Instrument Battery (SIB) (BT3)
  • Junction Box 2 (JB2)
  • Forward Maintenance Panel (PL42)
  • Electrical Control Panel (PL14)
  • Remote Data Concentrator (RDC) (A13)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Capacity Test

The ISI Battery system will incorporate an internal test load across the batteries when a level test is requested, while simultaneously removing battery voltage from the output voltage, it is connected to the test load. This test will be launched from the maintenance panel using the test switch or the from the front of the ISI BATT.

Once the test is initiated, an ISI BATT TEST ACTIVE signal is set to ground (TRUE) and sent to the RDC and the battery. The 'STBY INST BATT IN TEST' message (B3-271553) is displayed by the MDC.

If the TEST passes, the message (B3-271555) 'STBY INST BATT OK' will be displayed by the MDC for 15 seconds.

Quick Links:

Removal of the Electrical Control Panel AMM 24-31-01-000-801
Installation of the Electrical Control Panel AMM 24-31-01-400-801
Removal of the Standby Instrument Battery AMM 24-32-05-000-801
Installation of the Standby Instrument Battery AMM 24-32-05-400-801
Operational Test of the Integrated Standby-Instrument (ISI) Battery Capacity AMM 24-32-05-710-801
Removal of the Junction Box 2 AMM 24-63-05-000-803
Installation of the Junction box 2 AMM 24-63-05-400-803
Removal of the Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installation of the Remote Data Concentrator (RDC) AMM 31-41-05-400-802
Removal of the Integrated Standby Instrument AMM 34-12-01-000-801
Installation of the Integrated Standby Instrument AMM 34-12-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset the following Circuit Breakers: CB2-C6 'STBY INST/BATT' and CB2-7 'STBY INST BATT TEST'. Is the fault still present?

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

  2. Push (5 seconds) and release the Fault Reset switch in front of the SIB (BT3). Is the fault still present?

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

  3. Do Operational Test of the Integrated Standby-Instrument (ISI) Battery Capacity. Is the test satisfactory?

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

  4. Push and hold the BITE TEST in front of the SIB (BT3). Is the test satisfactory?

    1. If NO, replace the defective Standby Instrument Battery.
    2. If YES, continue with next step.

  5. Do a complete wiring check of the Standby Instrument Battery System. Is the check satisfactory?

    1. If NO, repair/replace wiring.
    2. If YES, continue with next step.

  6. Verify the functionality of the Maintenance Test Switch (S158) on the forward maintenance panel (PL42). Is the verification satisfactory?

    1. If NO, replace the defective maintenance panel.
    2. If YES, continue with next step.

  7. Verify the functionality of the STBY INST Switch (SDS68) on the Electrical Control Panel (PL14). Is the verification satisfactory?

    1. If NO, replace the defective Electrical System Control Panel.
    2. If YES, continue with next step.

  8. Verify the functionality of the Relay K157 circuitry located inside JB2. Is the verification satisfactory?

    1. If NO, replace the defective Junction Box.
    2. If YES, continue with next step.

  9. Replace the Standby Instrument Battery (BT3). Is the fault still present?

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

  10. Replace the Remote Data Concentrator (A13). Is the fault still present?

    1. If NO, continue with next step.
    2. If YES, replace the defective Junction Box (JB2).

  11. Do close out.

350_2432_019

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