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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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03/17/21

Message Overview:

Message Name:

TEMP PROBE I/O CIRCUIT

Message Code:

B3-006291

Associated CAS:

None

Reporting LRU: ADC 2
System Description: 34-13-00
Schematic Diagram: 34-13-00
Wiring Diagram: 34-13-01

Message Description:

The temp probe I/O for the right ADC is failed.

Possible Causes:

  • Right Air Data Computer (ADC 2) (A2)
  • Right Total Air Temperature (TAT) Probe (A16)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Total Air Temperature (TAT) Probe AMM 34-11-13-000-801
Installation of the Total Air Temperature (TAT) Probe AMM 34-11-13-400-801
Removal of the Air Data Computer AMM 34-13-01-000-801
Installation of the Air Data Computer AMM 34-13-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset AIR DATA 2 (CB2-C1) circuit breaker.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  2. Do the wiring check between ADC 2 connector A2P1 and TAT Probe connector A16P1. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Measure the resistance of the TAT Probe Sensing Element 2 between pin 2 and pin 5.

    1. If the resistance is approx. 500 Ω, go to step 5.
    2. If the resistance is not approx. 500 Ω, continue with next step.
      NOTE: TAT Probe sensing Element 1 has the same resistance value and can be used as comparator (pins 3 and 4).

  4. Replace the TAT Probe.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Swap ADCs.
  6. Do close out.

tat_probe_sensing

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