Narrative:

We were at our maximum gross takeoff weight and needed runway 8R at phx. Runways had just changed to runway 26. Much coordination was needed to work out a runway 8R departure. We were asked to expedite our taxi to runway 8R. Takeoff clearance was received and we were told to maintain runway heading. I missed the 'maintain runway heading.' we were cleared on the st johns 2 departure. Traffic was inbound on final for runway 26R and we reported them in sight. When traffic was reported in sight to departure control, I thought we were cleared normal navigation on the departure and I called for LNAV. I started a left turn at the pxr 075 degree/4 DME towards 020 degree heading. Passing about 040 degrees departure control asked if we were still heading 080 degrees. We immediately turned right to 080 degrees. There apparently was an arrival aircraft that could have been a potential conflict. Contributing factors: runway change during taxi out. Concern with flaps 5 degrees improved maximum takeoff weight. Expediting to make a small window of opportunity -- departing opposite direction of traffic. Briefing an LNAV departure. Missing 'maintain runway heading.' distraction with looking for traffic. Slow it down and listen more carefully.

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Original NASA ASRS Text

Title: ACR MLG REQUIRED RWY 8R ACCOUNT AT MAX TKOF GROSS WT, RWY IN USE RWY 26. CLRED RWY 8R MAINTAIN RWY HEADING CLRED FOR TKOF. CAPT, PF, RUSHING DEP FORGOT RWY HEADING RESTR AND BEGAN A TURN AT 4 DME PER SID. DEP CTLR QUESTIONED THE TURN AND THE CAPT IMMEDIATELY TURNED BACK TO RWY HEADING.

Narrative: WE WERE AT OUR MAX GROSS TKOF WT AND NEEDED RWY 8R AT PHX. RWYS HAD JUST CHANGED TO RWY 26. MUCH COORD WAS NEEDED TO WORK OUT A RWY 8R DEP. WE WERE ASKED TO EXPEDITE OUR TAXI TO RWY 8R. TKOF CLRNC WAS RECEIVED AND WE WERE TOLD TO MAINTAIN RWY HEADING. I MISSED THE 'MAINTAIN RWY HEADING.' WE WERE CLRED ON THE ST JOHNS 2 DEP. TFC WAS INBOUND ON FINAL FOR RWY 26R AND WE RPTED THEM IN SIGHT. WHEN TFC WAS RPTED IN SIGHT TO DEP CTL, I THOUGHT WE WERE CLRED NORMAL NAV ON THE DEP AND I CALLED FOR LNAV. I STARTED A L TURN AT THE PXR 075 DEG/4 DME TOWARDS 020 DEG HDG. PASSING ABOUT 040 DEGS DEP CTL ASKED IF WE WERE STILL HDG 080 DEGS. WE IMMEDIATELY TURNED R TO 080 DEGS. THERE APPARENTLY WAS AN ARR ACFT THAT COULD HAVE BEEN A POTENTIAL CONFLICT. CONTRIBUTING FACTORS: RWY CHANGE DURING TAXI OUT. CONCERN WITH FLAPS 5 DEGS IMPROVED MAX TKOF WT. EXPEDITING TO MAKE A SMALL WINDOW OF OPPORTUNITY -- DEPARTING OPPOSITE DIRECTION OF TFC. BRIEFING AN LNAV DEP. MISSING 'MAINTAIN RWY HEADING.' DISTR WITH LOOKING FOR TFC. SLOW IT DOWN AND LISTEN MORE CAREFULLY.

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.