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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 FGC-1 INPUT ON L-GP-5

Message Code:

B3-006867

Associated CAS:

STAB TRIM FAULT
(Advisory)

Reporting LRU: HORIZ TRIM ECU
System Description: 27-41-00
Schematic Diagram: 27-41-00
31-45-00
Wiring Diagram: 27-41-01

Message Description:

No Flight Guidance Computer 1 (FGC-1) Input to Horizontal Stabilizer Electronic Control Unit (HST ECU) on L-GP-5.

Possible Causes:

  • Flight Guidance Computer (FGC) (A4-FGC)
  • Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
  • L Input/Output Concentrator (L IOC) (A4-IOC1)
  • 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 (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

Before troubleshooting this problem, reset HST ECU by pulling CB1-B15 & CB2-B13 and then resetting CBs with aircraft power on. Continue with troubleshooting if fault persists.

Before performing wiring checks all LRU (line replaceable units) must be removed from rack connectors. BD-100 Schematic Manual 31-45-00 page 21 will aid in the identification of all LRUs on L-GP-5 Bus.

Quick Links:

Removal of the Flight Guidance Computer (FGC) AMM 22-11-01-000-801
Installation of the Flight Guidance Computer (FGC) AMM 22-11-01-400-801
Operational Test of the Flight Guidance Computer (FGC) AMM 22-11-01-710-802
Removal of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-000-801
Installation of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-400-801
Operational Test of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-710-801
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
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. Swap FGCs.

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

  2. Swap IOCs.

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

  3. Do wiring check (data bus) between FGC1 and IAPS (L IOC).

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

  4. Replace HST ECU.
  5. Do close out.

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