Both emb-145 airspeed indications became unreliable during the descent initiation from FL360 so the ...

Narrative:

During initial descent we noticed both primary airspeed tapes read erroneous. We complied with the aircraft operations manual (aom) 1 unreliable airspeed procedure. It appeared to have unfroze around FL290. We continued to treat the indications as unreliable and landed in our filed destination. My belief is moisture was present in the pitot lines beyond the protected areas. There was decent amount of frost present on the inside of the widows/windscreens; except where it is heated. After landing; there was water draining from the drain just aft of the nose gear. No airframe ice was encountered during the flight.continue to retrofit our fleet with the modification. Continue to provide proper training to flight crews. I have experienced this exact scenario during a simulator training line oriented flight training (loft). It was easier to detect the malfunction having seen it before.

Original NASA ASRS Text

Title: Both EMB-145 airspeed indications became unreliable during the descent initiation from FL360 so the Unreliable Airspeed procedure was accomplished. Airspeed indication returned to normal around FL290 and frozen moisture in the pitot system plumbing beyond the pitot tubes is suspected.

Narrative: During initial descent we noticed both primary airspeed tapes read erroneous. We complied with the Aircraft Operations Manual (AOM) 1 Unreliable Airspeed procedure. It appeared to have unfroze around FL290. We continued to treat the indications as unreliable and landed in our filed destination. My belief is moisture was present in the PITOT lines beyond the protected areas. There was decent amount of frost present on the inside of the widows/windscreens; except where it is heated. After landing; there was water draining from the drain just aft of the nose gear. No airframe ice was encountered during the flight.Continue to retrofit our fleet with the modification. Continue to provide proper training to flight crews. I have experienced this exact scenario during a simulator training Line Oriented Flight Training (LOFT). It was easier to detect the malfunction having seen it before.

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.

Attributes
ACN	1259774
Time
Date	201505
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Pitot/Static Ice System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown

Both emb-145 airspeed indications became unreliable during the descent initiation from FL360 so the unreliable airspeed procedure was accomplished. Airspeed indication returned to normal around FL290 and frozen moisture in the pitot system plumbing beyond the pitot tubes is suspected.