MD80 experiences track deviation on en route transition portion of triss RNAV SID from dfw.

Attributes
ACN	687467
Time
Date	200602
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : shero
State Reference	TX
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
Flight Phase	climbout : initial
Route In Use	departure sid : triss
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	687467
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	687475
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

Before departure from dfw; I loaded the triss 2 RNAV departure with runway 17R as the active runway. I followed it up with a route and legs check with no discrepancies found. The departure proceeded normally to triss intersection and then apparently we went direct to txk. ATC advised us that we were left of course and queried if we flew over shero intersection. We checked the progress page and found the last point to be triss. I do not know when shero fell out of the route; we did not modify the route after it was loaded. ATC notified us that there was no traffic conflict but that they would file an RNAV route anomaly report.

Original NASA ASRS Text

Title: MD80 EXPERIENCES TRACK DEV ON ENRTE TRANSITION PORTION OF TRISS RNAV SID FROM DFW.

Narrative: BEFORE DEP FROM DFW; I LOADED THE TRISS 2 RNAV DEP WITH RWY 17R AS THE ACTIVE RWY. I FOLLOWED IT UP WITH A RTE AND LEGS CHK WITH NO DISCREPANCIES FOUND. THE DEP PROCEEDED NORMALLY TO TRISS INTXN AND THEN APPARENTLY WE WENT DIRECT TO TXK. ATC ADVISED US THAT WE WERE L OF COURSE AND QUERIED IF WE FLEW OVER SHERO INTXN. WE CHKED THE PROGRESS PAGE AND FOUND THE LAST POINT TO BE TRISS. I DO NOT KNOW WHEN SHERO FELL OUT OF THE RTE; WE DID NOT MODIFY THE RTE AFTER IT WAS LOADED. ATC NOTIFIED US THAT THERE WAS NO TFC CONFLICT BUT THAT THEY WOULD FILE AN RNAV RTE ANOMALY RPT.

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.