B757 departing on a dfw RNAV SID is given heading vector to be flown after a subsequent fix on the SID. Instead; flight crew starts the turn immediately. Recover shortly with no separation problems.

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Attributes
ACN	696927
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 2000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	696927
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

After takeoff while climbing out on the LNAV departure runway 18L; was a given a clearance to take up a heading after an intersection down line on the departure. With radio congestion and aircraft clean up commands; instructions were misunderstood. We started our heading immediately; turned about 30 degrees. When recognized the problem; we turned back to intercept LNAV departure and continued flying the course. We were only off course for a few seconds when we realized the situation. After establishing course tracking we questioned ATC and they indicated there was no problem.

Original NASA ASRS Text

Title: B757 DEPARTING ON A DFW RNAV SID IS GIVEN HDG VECTOR TO BE FLOWN AFTER A SUBSEQUENT FIX ON THE SID. INSTEAD; FLT CREW STARTS THE TURN IMMEDIATELY. RECOVER SHORTLY WITH NO SEPARATION PROBS.

Narrative: AFTER TKOF WHILE CLBING OUT ON THE LNAV DEP RWY 18L; WAS A GIVEN A CLRNC TO TAKE UP A HDG AFTER AN INTXN DOWN LINE ON THE DEP. WITH RADIO CONGESTION AND ACFT CLEAN UP COMMANDS; INSTRUCTIONS WERE MISUNDERSTOOD. WE STARTED OUR HDG IMMEDIATELY; TURNED ABOUT 30 DEGS. WHEN RECOGNIZED THE PROB; WE TURNED BACK TO INTERCEPT LNAV DEP AND CONTINUED FLYING THE COURSE. WE WERE ONLY OFF COURSE FOR A FEW SECONDS WHEN WE REALIZED THE SITUATION. AFTER ESTABLISHING COURSE TRACKING WE QUESTIONED ATC AND THEY INDICATED THERE WAS NO PROB.

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.