While making ILS approach reporter aircraft flew off course. Approach intervened.

Attributes
ACN	117167
Time
Date	198907
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 2900 msl bound upper : 2900
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt
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 : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 100
ASRS Report	117167
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Copilot flying ILS 36R at clt. Both navigation's tuned and identified to ILS cleared for approach. Copilot returned to clt to set DME off clt then toggled back to ILS, but switch didn't go all the way back to ILS frequency. Therefore, we went off course on localizer. I noticed my localizer off course and told him to check his. Corrections were being made when ATC advised us to turn right. As far as traffic conflict, none that I know of.

Original NASA ASRS Text

Title: WHILE MAKING ILS APCH REPORTER ACFT FLEW OFF COURSE. APCH INTERVENED.

Narrative: COPLT FLYING ILS 36R AT CLT. BOTH NAV'S TUNED AND IDENTIFIED TO ILS CLRED FOR APCH. COPLT RETURNED TO CLT TO SET DME OFF CLT THEN TOGGLED BACK TO ILS, BUT SWITCH DIDN'T GO ALL THE WAY BACK TO ILS FREQ. THEREFORE, WE WENT OFF COURSE ON LOC. I NOTICED MY LOC OFF COURSE AND TOLD HIM TO CHECK HIS. CORRECTIONS WERE BEING MADE WHEN ATC ADVISED US TO TURN RIGHT. AS FAR AS TFC CONFLICT, NONE THAT I KNOW OF.

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.