Deviation from clearance during a heading track variation as an aural alert for an anti-ice ducting problem drowns out the heading issued by ATC to a carj on approach to dtw.

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Attributes
ACN	638497
Time
Date	200411
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	tracon : d21.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 250 flight time total : 4000 flight time type : 1200
ASRS Report	638497
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : aural anti ice warning other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Consequence	Other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Weather ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were in icing conditions. We had a warning message of 'anti-ice duct.' the aural alert was going off constantly. Bringing back power would alleviate the aural and message. Dtw approach told us to fly 180 KTS and 190 degree heading as the aural alert was going off. I repeated 180 KTS and 190 degree heading and we flew those parameters. A few mins later she informed us that we were supposed to be on a 090 degree heading. She gave us new vectors and all was well.

Original NASA ASRS Text

Title: DEV FROM CLRNC DURING A HDG TRACK VARIATION AS AN AURAL ALERT FOR AN ANTI-ICE DUCTING PROB DROWNS OUT THE HDG ISSUED BY ATC TO A CARJ ON APCH TO DTW.

Narrative: WE WERE IN ICING CONDITIONS. WE HAD A WARNING MESSAGE OF 'ANTI-ICE DUCT.' THE AURAL ALERT WAS GOING OFF CONSTANTLY. BRINGING BACK PWR WOULD ALLEVIATE THE AURAL AND MESSAGE. DTW APCH TOLD US TO FLY 180 KTS AND 190 DEG HDG AS THE AURAL ALERT WAS GOING OFF. I REPEATED 180 KTS AND 190 DEG HDG AND WE FLEW THOSE PARAMETERS. A FEW MINS LATER SHE INFORMED US THAT WE WERE SUPPOSED TO BE ON A 090 DEG HDG. SHE GAVE US NEW VECTORS AND ALL WAS WELL.

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.