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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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11/06/25

Message Overview:

Message Name:

INLET TEMP SENSOR [SIGNAL OUT HIGH]

Message Code:

4960194APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-60-00 - Auxiliary Power Unit
Schematic Diagram: [ Global Express ] [ G5000 ] [ Global XRS ] 49-61-00 - APU Automatic Control System
Wiring Diagram: [ Global Express ] [ G5000 ] [ Global XRS ] 49-61-01 - APU Automatic Control System 9002-9129
[ Global Express ] [ G5000 ] [ Global XRS ] 49-61-01 - APU Automatic Control System 9130-9158
[ Global Express ] [ G5000 ] [ Global XRS ] 49-61-00 - APU Automatic Control System All

Message Description:

Inlet Temperature signal higher than 199°C (390°F).

Possible Causes:

  • Pack Inlet Temperature Sensor 1 (E23)
  • Pack Inlet Temperature Sensor 2 (E29)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Connect Electrical Power to the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-801
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804
Removal of the Engine Branched Wiring-Harness [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-12-01-000-801
Installation of the Engine Branched Wiring-Harness [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-12-01-400-801
Removal of the Full-Authority Digital Engine-Controller (FADEC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-01-000-801
Installation of the Full-Authority Digital Engine-Controller (FADEC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-01-400-801
Removal of the Inlet Temperature Sensor [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-09-000-801
Installation of the Inlet Temperature Sensor [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-09-400-801

Troubleshooting Recommendations:

  1. Visually inspect the engine branched wiring-harness for bare wiring, kinks, worn areas and other damage.

    1. If harness checks are good, go to step 3.
    2. If there is bare wiring, kinks, worn areas or other damage, continue with next step.

  2. Replace or repair Engine branched wiring-harness.

    1. If fault message is gone, do close out.
    2. If fault message remains, continue with next step.

  3. Examine Inlet Temperature Sensor receptacle MT3 for contamination and damage.

    1. If Inlet Temperature Sensor receptacle MT3 is contaminated or damaged, go to step 7.
    2. If fault is gone, do close out.
    3. If fault remains, continue with next step.

  4. On Inlet Temperature Sensor receptacle MT3, do continuity check between pins A and B. If no open or short are present, continuity should be between 50 and 250 ohms. Continuity at various temperatures are as follows: 32 F = 90.38 ohms, 86 F = 100.91 ohms, 140 F=112.28 ohms and 194 F = 124.55 ohms (refer to CMM).

    1. If resistance is out of range, go to step 7.
    2. If resistance is within range and OMS fault remains, continue with next step.

  5. Perform wiring checks between P802 (APU) and (MT3P1) inlet temperature sensor (T2). Continuity should be less than one ohms, if no open circuit is present (refer to CMM).

      From To Result
      P802-63 MT3P1-A (+)
      P802-64 MT3P1-B (-)

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

  6. Perform wiring checks between J802 (AC wiring harness) and A108BP1 (APU FADEC).

      From To Result
      J802-63 A108BP1-H5 (+)
      J802-64 A108BP1-J5 (-)

    1. If wiring checks are not good, repair associated wiring and do close out.
    2. If wiring checks are good, continue with step 8.

  7. Replace Inlet Temperature Sensor (T2).

    1. If fault is gone from the OMS, do close out.
    2. If fault on the OMS remains, go to step 5.

  8. Replace APU FADEC.
  9. Do close out.

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