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(WARNING)
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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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02/16/21

Message Overview:

Message Name:

[ACSC1-A] FWD TRIM AIR VLV CMD /TAV

Message Code:

2161323ECS

Associated CAS:

TRIM AIR FAULT
(Advisory)

Reporting LRU: Air Conditioning System Controller (ACSC) 1
System Description: 21-60-00
Schematic Diagram: 21-60-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 21-60-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The FWD Trim Air Valve (TAV) (L18) position does not agree with the Air Conditioning System Controller (ACSC) 1 command.

Possible Causes:

  • FWD Trim Air Valve (TAV) (L18)
  • Junction Box (JB5)
  • Secondary Power Distribution Assembly (SPDA) 2 (A14)
  • Air Conditioning System Controller (ACSC) 1 (A87)
  • Bleed Air Control Panel (AP8)
  • Trim Air Switch (SDS6)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-21-0160 - "PACK FAULT" CAS message while CAIMS / OMS is active (Global Express / XRS - 9002 to 9312, 9314 to 9380, 9384 to 9429 and Global 5000 - 9127 to 9383, 9389 to 9400, 9404 to 9431 and 9998)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Trim Air Valves AMM 21-60-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Trim Air Valves AMM 21-60-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Air-Conditioning System Controllers AMM 21-60-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Air-Conditioning System Controllers AMM 21-60-21-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB5 AMM 24-00-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB5 AMM 24-00-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Secondary-Power Distribution Assemblies AMM 24-62-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Secondary-Power Distribution Assemblies AMM 24-62-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Interchange FWD Trim Air Valve with AFT Trim Air Valve.

    1. If the system checks are good, replace FWD Trim Air Valve and do close out.
    2. If the fault remains, continue with next step.

  2. Interchange SPDA 2 with SPDA 3.

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

  3. Interchange ACSC 1 with ACSC 2.

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

  4. Perform continuity check of JB5.

    1. If there is continuity, continue with next step.
    2. If there is no continuity, replace JB5 and do close out.

  5. Check K9 and K22 for correct operation.
  6. Perform a wiring checks of wires between FWD TAV and JB5.

    1. If the wiring checks are not good, repair the defective associated wiring and do close out.
    2. If the wiring checks are good, continue with next step.

  7. Perform a wiring check of wires between JB5 and ACSC1.

    1. If the wiring checks are not good, repair the defective associated wiring and do close out.
    2. If the wiring checks are good, continue with next step.

  8. Perform a wiring check of wires between JB5 and Bleed Air Control Panel TRIM AIR SWITCH.

    1. If the wiring checks are not good, repair the defective associated wiring and do close out.
    2. If the wiring checks are good, continue with next step.

  9. Check Trim Air Control Panel.
  10. Replace Bleed Air Control Panel.
  11. Do close out.

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