Narrative:

I entered flight plan into FMS. It was verified and compared to departure page -- TRISS2/txk trans -- flight plan legs and clearance. On taxi out; responded to dfw queue with correct information. I was pilot flying. At 500 ft; engaged navigation. Initial dfw departure control cleared us direct triss and normal speed. Captain entered clearance into FMS. I failed to verify entry. After passing triss; we continued along magenta flight path towards what we thought was our next fix. ZFW said that we were drifting left of course. They asked if we were proceeding toward shero or txk. We were heading towards txk -- incorrectly. We should have been going to shero. As pilot flying; I failed to verify next fix in FMS with published route. Not certain how shero was dropped from navigation route.

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Original NASA ASRS Text

Title: AN MD80 CREW ON THE DFW TRISS2/TXK WAS FLYING DIRECT TXK AFTER A DIRECT TRISS CLRNC BECAUSE THE INTERVENING WAYPOINTS WERE DROPPED FROM THE FMS. ATC REDIRECTED ON RTE.

Narrative: I ENTERED FLT PLAN INTO FMS. IT WAS VERIFIED AND COMPARED TO DEP PAGE -- TRISS2/TXK TRANS -- FLT PLAN LEGS AND CLRNC. ON TAXI OUT; RESPONDED TO DFW QUEUE WITH CORRECT INFO. I WAS PLT FLYING. AT 500 FT; ENGAGED NAV. INITIAL DFW DEP CTL CLRED US DIRECT TRISS AND NORMAL SPD. CAPT ENTERED CLRNC INTO FMS. I FAILED TO VERIFY ENTRY. AFTER PASSING TRISS; WE CONTINUED ALONG MAGENTA FLT PATH TOWARDS WHAT WE THOUGHT WAS OUR NEXT FIX. ZFW SAID THAT WE WERE DRIFTING L OF COURSE. THEY ASKED IF WE WERE PROCEEDING TOWARD SHERO OR TXK. WE WERE HEADING TOWARDS TXK -- INCORRECTLY. WE SHOULD HAVE BEEN GOING TO SHERO. AS PLT FLYING; I FAILED TO VERIFY NEXT FIX IN FMS WITH PUBLISHED RTE. NOT CERTAIN HOW SHERO WAS DROPPED FROM NAV RTE.

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.