Air carrier flight experiences anti-ice system failure while in icing conditions.

Attributes
ACN	463381
Time
Date	200002
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	MN
Altitude	msl single value : 9000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 60 flight time total : 10800 flight time type : 4500
ASRS Report	463381
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport flight crew : landed as precaution
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

Our deicing system failed in moderate ice conditions, so we declared an emergency and landed in msp. Minimal time in ice conditions.

Original NASA ASRS Text

Title: ACR FLT EXPERIENCES ANTI-ICE SYS FAILURE WHILE IN ICING CONDITIONS.

Narrative: OUR DEICING SYS FAILED IN MODERATE ICE CONDITIONS, SO WE DECLARED AN EMER AND LANDED IN MSP. MINIMAL TIME IN ICE CONDITIONS.

Data retrieved from NASA's ASRS site as of July 2007 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.