ARTCC advised flight crew they were diverging from airway enroute anc bet.

Attributes
ACN	106661
Time
Date	198903
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : anc
State Reference	AK
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : j501
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 17000 flight time type : 600
ASRS Report	106661
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Scheduled from anc to bethel, ak. Shortly after level off, ATC advised that we were 4 mi left of course and diverging. The anc VOR showed us on course but a check of sparrevohn VOR did, indeed, show us left of centerline. Thanking the center, a correction was made to reintercept the airway using the sparrevohn VOR. A check of both VOR receivers and instruments in-flight and on the ground failed to reveal any discrepancies.

Original NASA ASRS Text

Title: ARTCC ADVISED FLT CREW THEY WERE DIVERGING FROM AIRWAY ENROUTE ANC BET.

Narrative: SCHEDULED FROM ANC TO BETHEL, AK. SHORTLY AFTER LEVEL OFF, ATC ADVISED THAT WE WERE 4 MI LEFT OF COURSE AND DIVERGING. THE ANC VOR SHOWED US ON COURSE BUT A CHK OF SPARREVOHN VOR DID, INDEED, SHOW US L OF CENTERLINE. THANKING THE CENTER, A CORRECTION WAS MADE TO REINTERCEPT THE AIRWAY USING THE SPARREVOHN VOR. A CHK OF BOTH VOR RECEIVERS AND INSTRUMENTS INFLT AND ON THE GND FAILED TO REVEAL ANY DISCREPANCIES.

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.