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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:

INDICATED AIR SPEED FLAG (Warning)

Identifier: 341OBS004
Effectivity: AIRCRAFT 20501 - 20999
System: Navigation
Associated CAS: None
System Description: 34-13-00
Schematic Diagram: None
Wiring Diagram: 34-13-05
34-13-09

Message Description:

The red 'IAS' warning flag indicates invalid airspeed source.

  • A loss of all data from the selected ADC, most likely caused by a Air Data Computer fault or power failure.
  • Verification of system failure, or data bus loss can be checked on the MDC current fault page for further system details.

01_ias

Possible Causes:

  • Contamination of Pitot Static Line
  • Pitot Line P3
  • Static Line S3
  • Integrated Standby Instrument (ISI)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Functional Test (Leak Test) of the Standby Pitot-Static System AMM 34-11-00-790-802
Detailed Inspection of the P3 Pitot Probe AMM 34-11-01-220-801
Cleaning/Restoration of the Pitot-Static Probes AMM 34-11-01-160-801
Removal of the Standby Pitot Probe AMM 34-11-03-000-801
Installation of the Standby Pitot Probe AMM 34-11-03-400-801
Alignment Check of the Standby Pitot Probe AMM 34-11-03-820-801
Detailed Inspection of the P3 Pitot Probe AMM 34-11-03-220-801
Cleaning of the Standby Pitot Probe AMM 34-11-03-160-801
Removal of the S3 Static Ports AMM 34-11-05-000-801
Installation of the S3 Static Ports AMM 34-11-05-400-801
Servicing of the Pitot-Static Visual Drain AMM 34-11-09-616-801
Removal of the Integrated Standby Instrument AMM 34-12-01-000-801
Installation of the Integrated Standby Instrument AMM 34-12-01-400-801
Functional Test of the Integrated Standby Instrument AMM 34-12-01-720-801
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. Perform MDC Current/History Fault check, looking for ISI fault code.

    1. If fault code is found, consult the Challenger 350 Diagnostic Guide to interpret codes to perform related troubleshooting.
    2. If no fault code is found, continue with next step.

  2. Perform pitot line P3 and static line S3 contamination removal.

    1. If system checks are good, do close out.
    2. If fault remains, clean or replace Pitot Static port (P3).
    3. If fault remains,
    4. Replace Integrated Standby Instrument.

  3. Do close out.

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