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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 AHC1 LAT ACCEL INPUT

Message Code:

B3-648394

Associated CAS:

None

Reporting LRU: STALL COMPUTER
System Description: 27-32-00
34-45-00
Schematic Diagram: 27-32-00
Wiring Diagram: 27-32-05
34-45-05

Message Description:

No lateral acceleration data from L IRS. L IOC is not reporting L-IRS-1 data bus missing.

Possible Causes:

  • Stall Protection Computer (SPC) (A178)
  • Junction Box 1 (JB1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Functional Test of Junction Box JB1 AMM 24-63-01-720-801

Troubleshooting Recommendations:

  1. Reset STALL L PWR (CB1-B10) circuit breaker.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  2. Do the wiring check of the ARINC 429 data bus L-IRS-1 between SPC connector A178AP1 pins 33 & 45, through Junction Box 1, and IRU 1 connector A233P1 pins 43 & 44. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Replace SPC.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  4. Do close out.

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