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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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08/09/21

Message Overview:

Message Name:

NO IASC1A BUS TO DCU-RDC

Message Code:

B3-384480

Associated CAS:

None

Reporting LRU: IASC1 TST A
System Description: 21-23-00
Schematic Diagram: 21-23-00
Wiring Diagram: 21-31-03

Message Description:

The Data Concentrator Unit and RDC does not receive any data from the channel A of the Integrated Air System Controller 1.

Possible Causes:

  • Integrated Air System Controller (IASC1) (A55)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check the #1 IAS Controller circuit breaker CB1 D14 & CB1 E10, reset and re-check MDC for the bus fault.
  2. Check the #1 IAS Controller 28 VDC power input from CB1 D14 plug A55P2 pins 1 & 2. Verify the IAS controller channel A grounds A55P2 pins 3 & 4.
  3. Check the wiring between the #1 Integrated Air System Controller and the Data Concentrator Unit. IASC-A ARINC bus.
  4. Suspect the #1 IAS Controller, remove and replace per AMM.
  5. Operational test IAW AMM.

10_2iasc_location60_lh_cbpnl10_iasc_controller_location

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