Narrative:

Departing runway 7L. ATC flight plan: CHEZZ2.dryht.J74.txo.UKW7.dfw. Revised ATC clearance: CHEZZ2.dryht direct txo.UKW7.dfw. Routine preflight including a takeoff brief of departure to be flown. CHEZZ2 SID was an RNAV departure. First officer and I discussed procedures of the SID, decided to select navigation/radial switch to navigation and both navigation display to map mode. During taxi out to runway 7L, a reroute was issued. New route: stanfield one departure, cie transition. We reviewed stanfield one departure and the new route. Gfms was updated with stanfield one departure. We both had pxr VOR frequency set -- initial departure heading of 078 degrees was also set. But both of us failed to return navigation/radial switch to radial. Discussions were also made regarding notifying dispatch of our new route once we were airborne. First officer's takeoff was normal and once airborne, asked for heading select of 078 degrees to 1550 ft and then flew 075 degree heading. Shortly after, tower switched us to departure frequency. As I ended my initial contact with departure control, I observed 4.0 dtg on my navigation display and misunderstood for 4.0 DME for pxr VOR. (Navigation display was actually reading 4.0 dtg to waypoint pxr 4 DME.) I reminded first officer of our position of pxr VOR 4.0 DME and a turn to 190 degree heading was required. First officer initiated the turn to 190 degree heading. As we banked past 120 degree heading, departure control questioned our heading and proceeded to inform us that we have made our turn too soon. Departure control cleared us to fly a new heading and we complied immediately. At this moment, first officer and I noticed our error of incorrectly reading 4.9 dtg to waypoint pxr 4 for 4.0 DME off pxr VOR with navigation/radial switch to navigation. I immediately communicated with departure control of our error. Departure control mentioned no conflicting traffic and shortly after, cleared us direct to cie VOR. Remainder of flight to dfw was normal. Supplemental information from acn 602182: both of us failed to return navigation/radial switch back to radial. He observed 4.0 dtw on the navigation display and advised me to turn to the 190 degree heading. I glanced at the navigation display to verify the DME but since my setup was the same I also saw 4.0 and initiated the turn.

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Original NASA ASRS Text

Title: DEPARTING FROM PHX FLT CREW OF MD80, ORIGINALLY CLRED VIA CHEZZ RNAV FROM DEP, FAIL TO SELECT PROPER NAV MODE WHEN RECLRED VIA STANFIELD DEP.

Narrative: DEPARTING RWY 7L. ATC FLT PLAN: CHEZZ2.DRYHT.J74.TXO.UKW7.DFW. REVISED ATC CLRNC: CHEZZ2.DRYHT DIRECT TXO.UKW7.DFW. ROUTINE PREFLT INCLUDING A TKOF BRIEF OF DEP TO BE FLOWN. CHEZZ2 SID WAS AN RNAV DEP. FO AND I DISCUSSED PROCS OF THE SID, DECIDED TO SELECT NAV/RADIAL SWITCH TO NAV AND BOTH NAV DISPLAY TO MAP MODE. DURING TAXI OUT TO RWY 7L, A REROUTE WAS ISSUED. NEW RTE: STANFIELD ONE DEP, CIE TRANSITION. WE REVIEWED STANFIELD ONE DEP AND THE NEW RTE. GFMS WAS UPDATED WITH STANFIELD ONE DEP. WE BOTH HAD PXR VOR FREQ SET -- INITIAL DEP HDG OF 078 DEGS WAS ALSO SET. BUT BOTH OF US FAILED TO RETURN NAV/RADIAL SWITCH TO RADIAL. DISCUSSIONS WERE ALSO MADE REGARDING NOTIFYING DISPATCH OF OUR NEW RTE ONCE WE WERE AIRBORNE. FO'S TKOF WAS NORMAL AND ONCE AIRBORNE, ASKED FOR HDG SELECT OF 078 DEGS TO 1550 FT AND THEN FLEW 075 DEG HDG. SHORTLY AFTER, TWR SWITCHED US TO DEP FREQ. AS I ENDED MY INITIAL CONTACT WITH DEP CTL, I OBSERVED 4.0 DTG ON MY NAV DISPLAY AND MISUNDERSTOOD FOR 4.0 DME FOR PXR VOR. (NAV DISPLAY WAS ACTUALLY READING 4.0 DTG TO WAYPOINT PXR 4 DME.) I REMINDED FO OF OUR POS OF PXR VOR 4.0 DME AND A TURN TO 190 DEG HDG WAS REQUIRED. FO INITIATED THE TURN TO 190 DEG HDG. AS WE BANKED PAST 120 DEG HDG, DEP CTL QUESTIONED OUR HDG AND PROCEEDED TO INFORM US THAT WE HAVE MADE OUR TURN TOO SOON. DEP CTL CLRED US TO FLY A NEW HDG AND WE COMPLIED IMMEDIATELY. AT THIS MOMENT, FO AND I NOTICED OUR ERROR OF INCORRECTLY READING 4.9 DTG TO WAYPOINT PXR 4 FOR 4.0 DME OFF PXR VOR WITH NAV/RADIAL SWITCH TO NAV. I IMMEDIATELY COMMUNICATED WITH DEP CTL OF OUR ERROR. DEP CTL MENTIONED NO CONFLICTING TFC AND SHORTLY AFTER, CLRED US DIRECT TO CIE VOR. REMAINDER OF FLT TO DFW WAS NORMAL. SUPPLEMENTAL INFO FROM ACN 602182: BOTH OF US FAILED TO RETURN NAV/RADIAL SWITCH BACK TO RADIAL. HE OBSERVED 4.0 DTW ON THE NAV DISPLAY AND ADVISED ME TO TURN TO THE 190 DEG HDG. I GLANCED AT THE NAV DISPLAY TO VERIFY THE DME BUT SINCE MY SETUP WAS THE SAME I ALSO SAW 4.0 AND INITIATED THE TURN.

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.