Large transport aircraft in cruise had course deviation indicator flag, captain reporter selected first officer CDI to alternate. Aircraft drifted off course when reporter forgot to reselect auxiliary navigation.

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Attributes
ACN	369690
Time
Date	199705
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zme
State Reference	TN
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 14000 flight time type : 10000
ASRS Report	369690
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

When west of mcb proceeding eastbound first officer's CDI (course/deviation indicator) heading flag appeared. Captain selected first officer/CDI control switch to alternate on the CDI control panel. First officer heading flag disappeared. Captain reselected normal but turned switch too far, disconnecting autoplt. When autoplt reconnected captain failed to reselect auxiliary navigation for course navigation and aircraft drifted 8 mi off course.

Original NASA ASRS Text

Title: LGT ACFT IN CRUISE HAD COURSE DEV INDICATOR FLAG, CAPT RPTR SELECTED FO CDI TO ALTERNATE. ACFT DRIFTED OFF COURSE WHEN RPTR FORGOT TO RESELECT AUX NAV.

Narrative: WHEN W OF MCB PROCEEDING EBOUND FO'S CDI (COURSE/DEV INDICATOR) HEADING FLAG APPEARED. CAPT SELECTED FO/CDI CTL SWITCH TO ALTERNATE ON THE CDI CTL PANEL. FO HEADING FLAG DISAPPEARED. CAPT RESELECTED NORMAL BUT TURNED SWITCH TOO FAR, DISCONNECTING AUTOPLT. WHEN AUTOPLT RECONNECTED CAPT FAILED TO RESELECT AUX NAV FOR COURSE NAV AND ACFT DRIFTED 8 MI OFF COURSE.

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.