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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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03/02/21

Message Overview:

Message Name:

NO ISI MACH INPUT

Message Code:

B3-007963

Associated CAS:

STALL PROTECT FAIL
(Caution)

Reporting LRU: STALL COMPUTER
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:

No Mach Number input data from Integrated Standby Instrument.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0105 - "STALL PROTECT FAIL" Nuisance CAS Message (20501 - 20999)
  • SB100-27-14 - Modification - Stall Protection System - Introduction of the Stall Protection Computer (SPC) Part No. 822-1792-003 to Correct Loopback ARINC 429 Failure Messages (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

Nuisance CAS message "STALL PROTECT FAIL" (amber) that may be posted at the end of the Stall Protection Computer (SPC) power-up or during the Stall Warning System Pilot Activated Test (PAT). This is the procedure to validate whether there is an actual system fault.

  • 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).
  • 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.

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
Operational Test of the Stall Protection System (SPS) AMM 27-32-00-710-801
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.

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

  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.

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

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

  3. Do 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. Repair/replace as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.
      NOTE: An internal short of any LRU connected to this ARINC bus may cause the fault.

  4. Replace ISI.

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

  5. Replace SPC.
  6. Do close out.

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