Protect pitot-static probes to prevent unscheduled removal

Written By Hannah Tiongson

Effectivity: Global and Challenger aircraft 

ATA: 34-11 

By: Ying Tian – Technical Services 

Contamination, damage or degradation to pitot-static probes affects Air Data System (ADS) reliability and may contribute to “altitude split” or altimetry issues. In cases of contamination, the affected aircraft may require extensive troubleshooting of the entire ADS system, thus impacting aircraft availability or delaying flight operation.  

To maximize aircraft availability and reduce the unscheduled removal of pitot-static probes, Bombardier reminds operators and maintenance crews to use approved ground support equipment (GSE) covers to protect the pitot-static probes while the aircraft is parked or undergoing maintenance.  

However, altimetry issues are not always related to pitot-static probes; therefore, if troubleshooting is required, always follow the instructions in the SmartFix Plus tool for the applicable aircraft platform. Use associated fault code/Crew Alert System (CAS) message or Observed Faults, ATA 34-00-00, Navigation guidance.   

If the condition is not resolved, please contact Bombardier’s Customer Response Centre (CRC) for further assistance and recommendations. This will prevent unnecessary part replacements that may not correct the condition. 

The following provides additional guidance and information previously published via Advisory Wires (AW) and GSE information:  

Global Express, XRS, 5000 and Global 5000 featuring Vision Flight Deck and Global 6000: 

  • AW700-34-0346 - Air Data Computer (ADC) and Pitot-Static Probes Altitude Split and Troubleshooting Guidance  

  • AW700-34-0508 - Altitude Split Condition and Recommended Troubleshooting guidance (Vision Flight Deck) 

  • Illustrated Tool and Equipment Manual (ITEM) GSE pitot head cover. 
    Reference number 10X-12-19 - P/N: KPC3-775-625  

Challenger 3XX:  

  • AW300-30-0082 - Pitot-Static Heater 

  • AW300-34-0345 - Procedure for Unreliable  

  • ITEM GSE pitot probe cover. Reference number 10-10-08 - P/N: KPC3-825-65  

Challenger 6XX:  

  • AW600-34-2334 - Air Data Computer - No Fault Found Update and Troubleshooting Procedures 

  • AW600-34-2389 - Airworthiness Directive (AD) – Air Data Computer - Erroneous Airspeed and Altitude Indications 

  • AW600-34-2422 - Unreliable Airspeed Events and Information 

  • ITEM GSE pitot probe cover. Reference number 10-10-08 - P/N: KPC3-825-65 

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Hannah Tiongson
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