EMB145 first officer experiences wing anti ice failure during approach in icing conditions. An emerg...

Narrative:

We were being vectored for approach and on the downwind we got a wing a-ice fail master caution followed by an a-ice inoperative master warning. After adding more thrust the message initially went away. We had the thrust around 55% N1 but the master caution and warning came back and did not extinguish until we left icing conditions around 500 AGL. We assumed the anti ice system was malfunctioning so we declared an emergency to try to get out of the icing conditions as soon as possible. The main threat was the moderate icing. I read the memo pertaining to the anti ice messages associated with low power settings. I have seen these messages many times with low power settings. This is the only time I have ever seen these messages with a high power setting and they continued until we left icing.

Original NASA ASRS Text

Title: EMB145 First Officer experiences wing anti ice failure during approach in icing conditions. An emergency is declared and the warning light extinguishes at 500 FT AGL on the approach.

Narrative: We were being vectored for approach and on the downwind we got a WING A-ICE FAIL master caution followed by an A-ICE INOP master warning. After adding more thrust the message initially went away. We had the thrust around 55% N1 but the master caution and warning came back and did not extinguish until we left icing conditions around 500 AGL. We assumed the anti ice system was malfunctioning so we declared an emergency to try to get out of the icing conditions as soon as possible. The main threat was the moderate icing. I read the memo pertaining to the anti ice messages associated with low power settings. I have seen these messages many times with low power settings. This is the only time I have ever seen these messages with a high power setting and they continued until we left icing.

Data retrieved from NASA's ASRS site as of July 2013 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	1070681
Time
Date	201302
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Component
Aircraft Component	Aerofoil Ice System
Person 1
Function	First Officer
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

EMB145 first officer experiences wing anti ice failure during approach in icing conditions. An emergency is declared and the warning light extinguishes at 500 ft AGL on the approach.