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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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10/28/19

Message Overview:

TAT 3 FAIL
(Advisory)

DDG Reference: 34-11-00
Pilot Action (QRH): ADVISORY 11-3
System Description: 34-11-00
Schematic Diagram: 34-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-11-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Fuselage TAT Failed.

Possible Causes:

  • Total Air Temp (TAT) Probe 3 (E50)
  • Micro Air Data Computer (MADC) 3 (A29)
  • Heater/Brake Monitoring Unit (HBMU) (A121)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Total Air Temperature (TAT) Probes AMM 34-11-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Total Air Temperature (TAT) Probes AMM 34-11-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Micro Air-Data Computers AMM 34-11-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Micro Air-Data Computers AMM 34-11-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Micro Air-Data Computers AMM 34-11-09-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Stored Faults AMM 45-45-00-970-803 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Select related CAIMS message below:

    1. If no CAIMS fault message is present, continue with next step.

  2. Perform a resistance check of the TAT probe 3 (E50J1) sensing element as follows:

    From To Expected Result Result
    E50J1-3 E50P1-4 500 ohms

    1. If resistance value is correct, go to step 4.
    2. If resistance value is out of range, continue with next step.

  3. Replace the TAT probe. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  4. Perform a 115 VAC at TAT probe 3 (E50P1) as follows.

    From To Expected Result Result
    E50P1-1 E50P1-6 115 VAC

    1. If 115 VAC is present, go to step 7.
    2. If 115 VAC is not present, continue with next step.

  5. Perform a wiring check between TAT probe 3 (E50P1) and the HBMU 1 (A121P1).

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  6. Swap HBMU 1 with HBMU 2. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace defective HBMU and do close out.

  7. Perform a wiring check between TAT probe 3 (E50P1) and ADC 3 (A29P1).

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  8. Replace ADC 3.
  9. Do close out.

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