Narrative:

I was assigned the forcl 1 RNAV departure. When loading the RNAV departure the forck transition did not appear on the FMS; but it did show up on legs page and nav display when reviewed. Upon takeoff the mechl fix was indicted on nav display in proper order. When climbing out it was nav track on the FMA and autopilot on. The aircraft started a right turn to mechl fix early; for some reason the fix moved closer to airport. When I noticed the deviation our altitude was about 2000 feet; and before I could ask for corrective action; the controller called us and put us on a radar vector to spidy fix. No conflict of aircraft at this time. Also I got and rnp indication on the capt pfd but not on first officer pfd; which came on about 15 minutes into flight and stayed on for about 5-10 minutes and went out. Upon continuing flight navigation system was operating ok and all other fixes correct and did not have any further problems with navigation system. We also got a too low warning on takeoff after about 500 feet. We departed on runway 35L. Note: I called dispatch prior to leaving gate because the flight plan on the forcl 1 departure showed the south departure fixes even though we departed north. I think this departure is not correct in the navigation program for north departure. When problem happened after takeoff and noticed the deviation from what seemed to be a confusing event we should have declared unable RNAV departure and asked controller for radar vectors to fixes or track. Further communications with dispatch about confusion on flight plan and had another departure filed. I got the same RNAV departure from dispatch on my next flight and called them about the problem I had with the previous flight. This flight also came up with the same south fixes when we were taking off north. I got refiled by another RNAV departure which showed the appropriate north fixes on the flight plan. In talking with dispatch it seem we have a SID that they don't have for some departures for flight planning for specific destinations.

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Original NASA ASRS Text

Title: MD-83 flight crew experiences a track deviation during the FORCK 1 RNAV departure from Runway 35L at DFW. With the autopilot engaged the aircraft begin a turn to the east prior to reaching MECHL. The early turn is detected by ATC and a vector heading is provided.

Narrative: I was assigned the FORCL 1 RNAV DEPARTURE. When loading the RNAV departure the Forck transition did not appear on the FMS; but it did show up on legs page and nav display when reviewed. Upon takeoff the MECHL fix was indicted on nav display in proper order. When climbing out it was Nav Track on the FMA and autopilot on. The Aircraft started a right turn to Mechl fix early; for some reason the fix moved closer to Airport. When I noticed the deviation our altitude was about 2000 feet; and before I could ask for corrective action; the Controller called us and put us on a radar vector to SPIDY fix. No conflict of aircraft at this time. Also I got and RNP indication on the Capt PFD but not on FO PFD; which came on about 15 minutes into flight and stayed on for about 5-10 minutes and went out. Upon continuing flight NAV system was operating OK and all other fixes correct and did not have any further problems with NAV system. We also got a too low warning on Takeoff after about 500 feet. We departed on runway 35L. Note: I called dispatch prior to leaving gate because the flight plan on the FORCL 1 departure showed the South departure fixes even though we departed North. I Think this departure is not correct in the NAV program for North Departure. When problem happened after takeoff and noticed the deviation from what seemed to be a confusing event we should have declared unable RNAV departure and asked Controller for Radar vectors to fixes or track. Further communications with Dispatch about confusion on flight plan and had another Departure filed. I got the same RNAV departure from dispatch on my next flight and called them about the problem I had with the previous flight. This flight also came up with the same South Fixes when we were taking off North. I got refiled by another RNAV departure which showed the appropriate North Fixes on the Flight plan. In talking with dispatch it seem we have a SID that they don't have for some departures for flight planning for specific destinations.

Data retrieved from NASA's ASRS site 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.