MD80 fails to follow track on nobly RNAV departure from dfw.

Attributes
ACN	684656
Time
Date	200601
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : lit.vortac
State Reference	AR
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival star : nobly
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	684656
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	684655
Events
Anomaly	non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory
Supplementary
Problem Areas	FAA Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

Approximately 80 miles west of lit at FL310 on the NOBLY2 departure. FMS box and DFGS showed direct lit. Ft worth center called requesting confirmation of route of flight. We responded 'direct little rock.' he gave us a 15 degree left turn; saying we were 10.5 miles right of course. He shortly thereafter reclred us direct lit and gave us a frequency change. Flight continued without event.

Original NASA ASRS Text

Title: MD80 FAILS TO FOLLOW TRACK ON NOBLY RNAV DEP FROM DFW.

Narrative: APPROX 80 MILES W OF LIT AT FL310 ON THE NOBLY2 DEP. FMS BOX AND DFGS SHOWED DIRECT LIT. FT WORTH CTR CALLED REQUESTING CONFIRMATION OF RTE OF FLT. WE RESPONDED 'DIRECT LITTLE ROCK.' HE GAVE US A 15 DEG L TURN; SAYING WE WERE 10.5 MILES R OF COURSE. HE SHORTLY THEREAFTER RECLRED US DIRECT LIT AND GAVE US A FREQUENCY CHANGE. FLT CONTINUED WITHOUT EVENT.

Data retrieved from NASA's ASRS site as of January 2009 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.