While executing an ILS approach reporter aircraft drifted left of approach course and was vectored by ATC to the right because of proximity of traffic thus abandoning the ILS approach.

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Attributes
ACN	106224
Time
Date	198903
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw tower : fai
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 5500 flight time type : 500
ASRS Report	106224
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment other
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 4000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on approach to 3R at dtw, we were involved in configuring the airplane for landing. At this time we saw an air carrier medium large transport parallel to us. We decided he was on the ILS to 3L and discussed the legality of parallel ILS approachs. During this time of heavy cockpit load and distraction, we drifted left of the 3R ILS centerline. We observed this deviation and immediately corrected to the right. We had the localizer needle centered when ATC broke us off from the approach to 3R.

Original NASA ASRS Text

Title: WHILE EXECUTING AN ILS APCH REPORTER ACFT DRIFTED LEFT OF APCH COURSE AND WAS VECTORED BY ATC TO THE RIGHT BECAUSE OF PROX OF TRAFFIC THUS ABANDONING THE ILS APCH.

Narrative: WHILE ON APCH TO 3R AT DTW, WE WERE INVOLVED IN CONFIGURING THE AIRPLANE FOR LNDG. AT THIS TIME WE SAW AN ACR MLG PARALLEL TO US. WE DECIDED HE WAS ON THE ILS TO 3L AND DISCUSSED THE LEGALITY OF PARALLEL ILS APCHS. DURING THIS TIME OF HEAVY COCKPIT LOAD AND DISTR, WE DRIFTED L OF THE 3R ILS CENTERLINE. WE OBSERVED THIS DEVIATION AND IMMEDIATELY CORRECTED TO THE RIGHT. WE HAD THE LOC NEEDLE CENTERED WHEN ATC BROKE US OFF FROM THE APCH TO 3R.

Data retrieved from NASA's ASRS site as of August 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.