Emb-145LR flight crew reported pitot tube 2 iced up and showed incorrect information. Indications re...

Attributes
ACN	1269050
Time
Date	201506
Local Time Of Day	1801-2400
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pitot/Static Ice System
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence

Narrative:

While working our way around thunderstorms that were near chicago; we had pitot 2 freeze over in flight. We had no EICAS message indicating that we had a failure of the pitot heat. We had a cass message indicating that there was a split in the airspeed. As we increased and decreased speed; the first officer's indicated speed remained steady as the captain and standby indicated speed matched. As we descended the first officer showed a decrease in speed as we descended. We had a slight variation in altitude reading between the captain and first officer altimeter. As we descended below FL270 the ice apparently melted as the speed decreased to zero; followed by an increase to match the captain and standby indicated speeds.the aircraft was never in a uas as we controlled the plane by reference to the captain and standby instruments.

Original NASA ASRS Text

Title: EMB-145LR flight crew reported pitot tube 2 iced up and showed incorrect information. Indications returned to normal when the flight descended into warmer temperatures.

Narrative: While working our way around thunderstorms that were near Chicago; we had pitot 2 freeze over in flight. We had no EICAS message indicating that we had a failure of the pitot heat. We had a CASS message indicating that there was a split in the airspeed. As we increased and decreased speed; the First Officer's indicated speed remained steady as the Captain and standby indicated speed matched. As we descended the First Officer showed a decrease in speed as we descended. We had a slight variation in altitude reading between the Captain and First Officer altimeter. As we descended below FL270 the ice apparently melted as the speed decreased to zero; followed by an increase to match the Captain and standby indicated speeds.The aircraft was never in a UAS as we controlled the plane by reference to the Captain and standby instruments.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Emb-145LR flight crew reported pitot tube 2 iced up and showed incorrect information. Indications returned to normal when the flight descended into warmer temperatures.