A319 crew had track deviation departing cos on the springs 2 SID.

Attributes
ACN	517444
Time
Date	200107
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : brk.vortac
State Reference	CO
Altitude	msl single value : 15000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : cos.tracon artcc : zjx.artcc
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 15500 flight time type : 650
ASRS Report	517444
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued new clearance controller : issued alert none taken : detected after the fact
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After takeoff from runway 17L at cos, departure control told us to turn left to heading 080 degrees and intercept the brk 110 degree radial. Our clearance was springs 2 as filed, which was cos..brk 110 degrees 45 DME (brk 45)..hgo..lbf flight plan route. I had programmed the brk 110 degree 45DME fix into the FMS followed by hgo. The 080 degree heading on our navigation display indicated an intercept between brk 45 and hgo. Both the first officer and I interpreted the clearance to intercept at that point, and not the brk 110 degree radial. As we flew past the radial, the controller asked us what our heading was. A query with the controller indicated that our heading and position was good and continue to fly heading 080 degrees. This was our third flight after an XA10 takeoff from an eastern time zone airport. The first officer and I briefed the insertion of brk 45 and our departure clearance. We misinterped the interception point because of the navigation display depiction of brk 45 and hgo. A clearance to intercept the brk 110 degree radial to brk 45 would have positively idented the intercept point for us.

Original NASA ASRS Text

Title: A319 CREW HAD TRACK DEV DEPARTING COS ON THE SPRINGS 2 SID.

Narrative: AFTER TKOF FROM RWY 17L AT COS, DEP CTL TOLD US TO TURN L TO HDG 080 DEGS AND INTERCEPT THE BRK 110 DEG RADIAL. OUR CLRNC WAS SPRINGS 2 AS FILED, WHICH WAS COS..BRK 110 DEGS 45 DME (BRK 45)..HGO..LBF FLT PLAN RTE. I HAD PROGRAMMED THE BRK 110 DEG 45DME FIX INTO THE FMS FOLLOWED BY HGO. THE 080 DEG HDG ON OUR NAV DISPLAY INDICATED AN INTERCEPT BTWN BRK 45 AND HGO. BOTH THE FO AND I INTERPED THE CLRNC TO INTERCEPT AT THAT POINT, AND NOT THE BRK 110 DEG RADIAL. AS WE FLEW PAST THE RADIAL, THE CTLR ASKED US WHAT OUR HDG WAS. A QUERY WITH THE CTLR INDICATED THAT OUR HDG AND POS WAS GOOD AND CONTINUE TO FLY HDG 080 DEGS. THIS WAS OUR THIRD FLT AFTER AN XA10 TKOF FROM AN EASTERN TIME ZONE ARPT. THE FO AND I BRIEFED THE INSERTION OF BRK 45 AND OUR DEP CLRNC. WE MISINTERPED THE INTERCEPTION POINT BECAUSE OF THE NAV DISPLAY DEPICTION OF BRK 45 AND HGO. A CLRNC TO INTERCEPT THE BRK 110 DEG RADIAL TO BRK 45 WOULD HAVE POSITIVELY IDENTED THE INTERCEPT POINT FOR US.

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.