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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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04/26/21

Message Overview:

Message Name:

PITOT STATIC HEAT ON WHEN NOT SELECTED

Identifier: 303OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Ice & Rain
System Description: 30-31-00
Schematic Diagram: 30-31-00
Wiring Diagram: 30-31-01

Message Description:

Pitot Static Heat ON regardless of the heater selection.

Possible Causes:

  • Left Static Port (A139)
  • Left Pitot/Static Probe (A137)
  • Left Angle of Attack Sensor (A141)
  • Right Static Port (A140)
  • Right Pitot/Static Probe (A138)
  • Right Angle of Attack Sensor (A142)
  • Standby Pitot Probe (A143)
  • Left Air Data Sensor (ADS) Heater Current Monitor (HCM) (A135)
  • Right Air Data Sensor (ADS) Heater Current Monitor (HCM) (A136)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Air-Data-Sensor Heater-Current Monitor AMM 30-31-01-000-801
Installation of the Air-Data-Sensor Heater-Current Monitor AMM 30-31-01-400-801
Detailed Inspection of the Static Ports AMM 34-11-00-220-801
Removal of the Pitot-Static Probe AMM 34-11-01-000-801
Installation of the Pitot-Static Probe AMM 34-11-01-400-801
Alignment Check of the Pitot-Static Probes AMM 34-11-01-820-801
Cleaning/Restoration of the Pitot-Static Probes AMM 34-11-01-160-801
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. When a Pitot-Static probe is found heating uncommanded on ground, the electrical power to the affected probe should be removed by pulling the circuit breaker CB1-E2 or CB2-E2 to prevent it from remaining heated.
  2. The affected Pitot-Static probe should be checked with a multimeter to verify if the heater elements are short circuited to ground.

    1. If an element is found short circuited to ground, replace the Pitot-Static probe.
    2. If the affected probe heater element is not short circuited to ground, continue with next step.

  3. Disconnect the Air Data Sensor (ADS) Heater Current Monitor (HCM) associated to the probe. Verify if the wiring interface between the probe and the ADS HCM is short circuited to ground.

    1. If there is continuity to ground, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  4. Replace the ADS Heater Current Monitor and do close out.
  5. Do close out.

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