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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 BUS OUTPUT

Message Code:

B3-007001

Associated CAS:

STALL PROTECT FAIL
(Caution)

Reporting LRU: Integrated Standby Instrument (ISI)
System Description: 27-32-00
34-12-00
Schematic Diagram: 27-32-00
34-12-00
Wiring Diagram: 27-32-01
34-12-01

Message Description:

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

Possible Causes:

  • Junction Box 3 (JB3)
  • Integrated Standby Instrument (ISI) (A90)
  • Stall Protection Computer (SPC) (A178)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0081 - Spoiler Electronic Control Unit (SECU) and Horizontal Stabilizer Electronic Control Unit (HSTECU) - Cold Temperature Circuit Breaker Reset Procedure
  • SB 100-27-14 - MODIFICATION - STALL PROTECTION SYSTEM - Introduction of the Stall Protection Computer (SPC) Part No. 822-1792-003 to Correct Loopback ARINC 429 Failure Messages

Forum Articles/Infoservice/Newsletter: None

NOTE: If the 'STALL PROTECT FAIL' message appears after SPC power up, reset the SPC circuit breakers 'SPC CH A' (CBP1-B10) and 'SPC CH B' (CBP2-B10).

NOTE: If the message appears following a PAT, then reset the SPC circuit breakers 'SPC CH A' (CBP1-B10) and "SPC CH B" (CBP2-B10). Perform another PAT and make sure the message does not come back.

NOTE: If the 'STALL PROTECT FAIL' CAS message and associated cascading messages do not clear after performing the steps above, troubleshooting should be performed.

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
Functional Test of the Stall Protection System AMM 27-32-00-720-801
Removal of the Stall Protection Computer AMM 27-32-01-000-801
Installation of the Stall Protection Computer AMM 27-32-01-400-801
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. Reset the STBY INST PBA. Is the fault still present?

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

  2. Reset the following circuit breakers and perform the Pilot Activated Test (PAT) of the Stall Protection System on the Systems Test control-panel located on the center pedestal. Is the fault still present?

    STALL L PWR CB1-B10
    STALL R PWR CB2-B10

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

  3. Perform a wiring check of the ARINC 429 ISI-1 data bus between ISI connector A90P1, Junction Box #3, SPC connectors A178AP1 / A178BP1 and DCU connector A14FP1.
    NOTE: An internal short of any LRU connected to this ARINC data bus may cause the fault.

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  4. Replace the ISI. Is the fault still present?

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

  5. Replace the SPC.
  6. Do close out.

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