Narrative:

Departure control (dfw) cleared us to go direct nobly on the departure route. FMS accepted the direct exec command but at that time it cleared the cobug and ortro fixes for the trans to little rock. We didn't realize the drop of the fixes until the system was going to lit from nobly and then ATC advised of the deviation. The FMS did again accept the manual inputs for the trans route. As we all know that on track is very important but at least one crewmember should extend route outlay of FMS to ensure that if fixes are dropped then it is known instantly. Never has this happened to me or the captain flying as first officer before. We both did verify the route and fixes prior to pushback per flight plan and SID charts. No changes were made to FMS during taxi.

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Original NASA ASRS Text

Title: CRJ-700 ON RNAV SID FROM DFW LOSES ASSOCIATED TRANSITION WAYPOINTS WHEN GIVEN CLRNC DIRECT TO NOBLY INSTEAD OF FLYING CHARTED TRACK.

Narrative: DEP CTL (DFW) CLRED US TO GO DIRECT NOBLY ON THE DEP RTE. FMS ACCEPTED THE DIRECT EXEC COMMAND BUT AT THAT TIME IT CLRED THE COBUG AND ORTRO FIXES FOR THE TRANS TO LITTLE ROCK. WE DIDN'T REALIZE THE DROP OF THE FIXES UNTIL THE SYSTEM WAS GOING TO LIT FROM NOBLY AND THEN ATC ADVISED OF THE DEVIATION. THE FMS DID AGAIN ACCEPT THE MANUAL INPUTS FOR THE TRANS RTE. AS WE ALL KNOW THAT ON TRACK IS VERY IMPORTANT BUT AT LEAST ONE CREWMEMBER SHOULD EXTEND RTE OUTLAY OF FMS TO ENSURE THAT IF FIXES ARE DROPPED THEN IT IS KNOWN INSTANTLY. NEVER HAS THIS HAPPENED TO ME OR THE CAPT FLYING AS FO BEFORE. WE BOTH DID VERIFY THE RTE AND FIXES PRIOR TO PUSHBACK PER FLT PLAN AND SID CHARTS. NO CHANGES WERE MADE TO FMS DURING TAXI.

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.