Narrative:

The ATC system uses a variety of SID; which carry a name and number designator; such as DALL8 and HUBB5. 4 of the sids from the dfw area are: NOBLY2; TRISS2; SOLDO2; CLARE2. We recently had a pilot cleared 'triss 2 txk.' the pilot questioned this clearance by saying 'verify triss direct to txk.' the confusion is over 'two' versus 'to.' we have had numerous pltdevs associated with these RNAV departures; and I wonder if the distraction between 'to' and 'two' could be the cause. I also wonder how many other situations around the country have occurred because of this confusion; and whether eliminating the number 'two' from SID and STAR numbering could resolve that confusion.

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Original NASA ASRS Text

Title: ZFW CTLR EXPRESSED CONCERN REGARDING SID NAMES/NUMBERS POSSIBLY CAUSING CONFUSION BETWEEN THE NUMBER TWO AND ROUTING TO.

Narrative: THE ATC SYS USES A VARIETY OF SID; WHICH CARRY A NAME AND NUMBER DESIGNATOR; SUCH AS DALL8 AND HUBB5. 4 OF THE SIDS FROM THE DFW AREA ARE: NOBLY2; TRISS2; SOLDO2; CLARE2. WE RECENTLY HAD A PLT CLRED 'TRISS 2 TXK.' THE PLT QUESTIONED THIS CLRNC BY SAYING 'VERIFY TRISS DIRECT TO TXK.' THE CONFUSION IS OVER 'TWO' VERSUS 'TO.' WE HAVE HAD NUMEROUS PLTDEVS ASSOCIATED WITH THESE RNAV DEPS; AND I WONDER IF THE DISTR BTWN 'TO' AND 'TWO' COULD BE THE CAUSE. I ALSO WONDER HOW MANY OTHER SITUATIONS AROUND THE COUNTRY HAVE OCCURRED BECAUSE OF THIS CONFUSION; AND WHETHER ELIMINATING THE NUMBER 'TWO' FROM SID AND STAR NUMBERING COULD RESOLVE THAT CONFUSION.

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.