E170 flight crew reports autoflt system turned early and in the wrong direction on TRISS2 RNAV SID from runway 17R at dfw.

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Attributes
ACN	692732
Time
Date	200603
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 170/175 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure sid : triss
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7200 flight time type : 700
ASRS Report	692732
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course flight crew : overrode automation
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Taking off on TRISS2 RNAV departure runway 17R out of dfw; the aircraft started to bank to the right instead of staying on the RNAV course. This happened about 500 ft as soon as we engaged the autoplt coupled to the FMS navigation. We corrected back on course as soon as it started to bank to the right. We followed our RNAV departure procedures according to the company manual. We don't know what caused the aircraft to deviation from the RNAV departure. ATC inquired about the deviation and we told him we were correcting back on course.

Original NASA ASRS Text

Title: E170 FLT CREW RPTS AUTOFLT SYSTEM TURNED EARLY AND IN THE WRONG DIRECTION ON TRISS2 RNAV SID FROM RWY 17R AT DFW.

Narrative: TAKING OFF ON TRISS2 RNAV DEP RWY 17R OUT OF DFW; THE ACFT STARTED TO BANK TO THE R INSTEAD OF STAYING ON THE RNAV COURSE. THIS HAPPENED ABOUT 500 FT AS SOON AS WE ENGAGED THE AUTOPLT COUPLED TO THE FMS NAV. WE CORRECTED BACK ON COURSE AS SOON AS IT STARTED TO BANK TO THE R. WE FOLLOWED OUR RNAV DEP PROCS ACCORDING TO THE COMPANY MANUAL. WE DON'T KNOW WHAT CAUSED THE ACFT TO DEV FROM THE RNAV DEP. ATC INQUIRED ABOUT THE DEV AND WE TOLD HIM WE WERE CORRECTING BACK ON COURSE.

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.