ARTCC informed flight crew of a B757 that they were off course while en route on a direct course using LNAV autoplt navigation. ATC issued a new direct course from that location.

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Attributes
ACN	378281
Time
Date	199708
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lev
State Reference	LA
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	378281
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	378280
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

ATC facility: houston. Location: between nepta and lev. While flying between nepta and lev on a course direct to elp, center advised us that we were north of course. We were on autoplt, LNAV engaged, and on the direct magenta course to elp. Center then advised us to proceed direct to sso. No conflict with other traffic was noted.

Original NASA ASRS Text

Title: ARTCC INFORMED FLC OF A B757 THAT THEY WERE OFF COURSE WHILE ENRTE ON A DIRECT COURSE USING LNAV AUTOPLT NAV. ATC ISSUED A NEW DIRECT COURSE FROM THAT LOCATION.

Narrative: ATC FACILITY: HOUSTON. LOCATION: BTWN NEPTA AND LEV. WHILE FLYING BTWN NEPTA AND LEV ON A COURSE DIRECT TO ELP, CTR ADVISED US THAT WE WERE N OF COURSE. WE WERE ON AUTOPLT, LNAV ENGAGED, AND ON THE DIRECT MAGENTA COURSE TO ELP. CTR THEN ADVISED US TO PROCEED DIRECT TO SSO. NO CONFLICT WITH OTHER TFC WAS NOTED.

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.