Narrative:

Our filed route was dfw TEX9 rolls oathe. The pre departure clearance included 'attention route change; LOWGN2 rolls.' we interpreted this to mean that instead of being vectored to rolls; we would be vectored to lowgn first and then to rolls; since lowgn appears on the TEX9 SID. If the pre departure clearance had read 'attention route change dfw LOWGN2 rolls' we would not have made the mistake. In fact; by removing the old routing from the pre departure clearance; nobody will ever make a similar mistake. A second factor is that we were never directed to switch from ground to clearance delivery in order to verify the first waypoint on the new RNAV departure; as described in the special procedure page of the commercial charts. This would have prevented the error at dfw; but in order to prevent this error at all of the other airports; please do not send both the old and new clrncs over pre departure clearance. The best thing to do would be prevent any possible confusion by changing the way route changes are handled on pre departure clearance. The only clearance we need is the valid one.

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Original NASA ASRS Text

Title: B737 CREW MISUNDERSTANDS PDC; AND DEPARTS DFW USING WRONG SID PROC.

Narrative: OUR FILED RTE WAS DFW TEX9 ROLLS OATHE. THE PDC INCLUDED 'ATTN RTE CHANGE; LOWGN2 ROLLS.' WE INTERPED THIS TO MEAN THAT INSTEAD OF BEING VECTORED TO ROLLS; WE WOULD BE VECTORED TO LOWGN FIRST AND THEN TO ROLLS; SINCE LOWGN APPEARS ON THE TEX9 SID. IF THE PDC HAD READ 'ATTN RTE CHANGE DFW LOWGN2 ROLLS' WE WOULD NOT HAVE MADE THE MISTAKE. IN FACT; BY REMOVING THE OLD ROUTING FROM THE PDC; NOBODY WILL EVER MAKE A SIMILAR MISTAKE. A SECOND FACTOR IS THAT WE WERE NEVER DIRECTED TO SWITCH FROM GND TO CLRNC DELIVERY IN ORDER TO VERIFY THE FIRST WAYPOINT ON THE NEW RNAV DEP; AS DESCRIBED IN THE SPECIAL PROC PAGE OF THE COMMERCIAL CHARTS. THIS WOULD HAVE PREVENTED THE ERROR AT DFW; BUT IN ORDER TO PREVENT THIS ERROR AT ALL OF THE OTHER ARPTS; PLEASE DO NOT SEND BOTH THE OLD AND NEW CLRNCS OVER PDC. THE BEST THING TO DO WOULD BE PREVENT ANY POSSIBLE CONFUSION BY CHANGING THE WAY RTE CHANGES ARE HANDLED ON PDC. THE ONLY CLRNC WE NEED IS THE VALID ONE.

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.