C550 on RNAV SID from dfw turns early and slowly and exceeds track parameters.

Attributes
ACN	677554
Time
Date	200511
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 0 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure sid : lowgn
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 8500 flight time type : 600
ASRS Report	677554
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance Chart Or Publication Aircraft
Primary Problem	Aircraft

Narrative:

Departing dfw we were assigned the lowgn 2 RNAV departure and we loaded it into our kln 90B GPS. After takeoff we flew to the bpark intersection as published with the autoplt on. After bpark the autoplt made a slow turn toward the next intersection (yamel) and as a result of our speed (220 KTS) and slow turn rate we ended up south of the RNAV route by greater than 2 miles. ATC advised us of this and had us proceed direct to bingm intersection which is further along the lowgn 2 departure. In retrospect how we could have avoided this problem is: 1) fly the departure manually. 2) set scale on GPS lower so that course deviations are more apparent. 3) use NAV1 function on GPS to get a backup CDI indication for greater accuracy. 4) consider requesting a non RNAV SID due to older equipment.

Original NASA ASRS Text

Title: C550 ON RNAV SID FROM DFW TURNS EARLY AND SLOWLY AND EXCEEDS TRACK PARAMETERS.

Narrative: DEPARTING DFW WE WERE ASSIGNED THE LOWGN 2 RNAV DEP AND WE LOADED IT INTO OUR KLN 90B GPS. AFTER TAKEOFF WE FLEW TO THE BPARK INTERSECTION AS PUBLISHED WITH THE AUTOPLT ON. AFTER BPARK THE AUTOPLT MADE A SLOW TURN TOWARD THE NEXT INTERSECTION (YAMEL) AND AS A RESULT OF OUR SPD (220 KTS) AND SLOW TURN RATE WE ENDED UP S OF THE RNAV RTE BY GREATER THAN 2 MILES. ATC ADVISED US OF THIS AND HAD US PROCEED DIRECT TO BINGM INTERSECTION WHICH IS FURTHER ALONG THE LOWGN 2 DEP. IN RETROSPECT HOW WE COULD HAVE AVOIDED THIS PROB IS: 1) FLY THE DEP MANUALLY. 2) SET SCALE ON GPS LOWER SO THAT COURSE DEVS ARE MORE APPARENT. 3) USE NAV1 FUNCTION ON GPS TO GET A BACKUP CDI INDICATION FOR GREATER ACCURACY. 4) CONSIDER REQUESTING A NON RNAV SID DUE TO OLDER EQUIPMENT.

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.