BA32 crew failed to track outbound course after VOR passage.

Attributes
ACN	433950
Time
Date	199904
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : sli.vortac
State Reference	CA
Altitude	msl single value : 19000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 119
Navigation In Use	other vortac
Flight Phase	cruise : level
Route In Use	enroute airway : v23.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 3400 flight time type : 1000
ASRS Report	433950
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued advisory flight crew : returned to intended course
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We passed over sli VOR and continued on a heading 139 degrees. Victor 23 was 120 degrees outbound from sli VOR. The center controller asked what our clearance was, and then directed us to turn 30 degrees left to intercept the airway. Our estimation was that we were 6 NM to the right of the airway centerline. The captain was flying and he and I were talking. We did not notice passing sli VOR. Contributing factors could have been the length of duty day. We were on duty since XA00. This occurred at approximately XJ30. We also had 1 more leg later.

Original NASA ASRS Text

Title: BA32 CREW FAILED TO TRACK OUTBOUND COURSE AFTER VOR PASSAGE.

Narrative: WE PASSED OVER SLI VOR AND CONTINUED ON A HDG 139 DEGS. VICTOR 23 WAS 120 DEGS OUTBOUND FROM SLI VOR. THE CTR CTLR ASKED WHAT OUR CLRNC WAS, AND THEN DIRECTED US TO TURN 30 DEGS L TO INTERCEPT THE AIRWAY. OUR ESTIMATION WAS THAT WE WERE 6 NM TO THE R OF THE AIRWAY CTRLINE. THE CAPT WAS FLYING AND HE AND I WERE TALKING. WE DID NOT NOTICE PASSING SLI VOR. CONTRIBUTING FACTORS COULD HAVE BEEN THE LENGTH OF DUTY DAY. WE WERE ON DUTY SINCE XA00. THIS OCCURRED AT APPROX XJ30. WE ALSO HAD 1 MORE LEG LATER.

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.