Narrative:

Prior to engine start at teb; I was attempting to enter our cleared routing into the FMS (GNS-xls-prnav). I entered the assigned departure procedure (RUUDY2 RNAV departure). After the last fix in the departure procedure; a required discontinuity line was present. In the first line after the discontinuity line; I entered the first fix for the remainder of the cleared routing (brezy). I then attempted to enter an airway from brezy (V39); the FMS did not recognize or accept this airway. I do not know why V39 was not recognized or accepted. I then removed brezy from the flight plan and re-entered brezy into the discontinuity line (the discontinuity line immediately following the departure procedure); thereby eliminating the discontinuity. In this way; V39 was now recognized and accepted by the FMS. The discontinuity was required because the departure procedure terminates with the aircraft flying a departure procedure specified heading. I was the monitoring pilot in the right seat. The procedure requires flying a heading to join a course to the first fix on the departure procedure; cross the second fix; cross the last fix; and then fly the specified heading. After takeoff we joined the course to the first departure procedure fix; while arming the navigation mode for the flying pilot so as to use the FMS for course guidance. We are based at teb and have become accustomed to receiving an ATC vector prior to reaching the last fix on this departure procedure. Upon reaching the last fix on the departure procedure; the flying pilot turned towards brezy (following the FMS guidance through the flight director); instead of flying the specified departure procedure heading. I am not sure if we had completed the (improper) turn (towards brezy) or not when ATC queried where we were going. Around the same time as the query from ATC; we were reaching our assigned altitude of 7;000 ft during the level off; we momentarily allowed the aircraft to reach 7;200 ft. Things which contributed to the navigation error:1) our failure to have a clear understanding of the departure procedure prior to departure.2) our expectation of an ATC vector prior to the end of the departure procedure.3) the non-intuitive and possible error in the FMS that does not promote maintaining the discontinuity in the flight plan (which would have terminated FMS guidance after the last departure procedure fix).

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Original NASA ASRS Text

Title: A First Officer reports difficulty entering the RUUDY2 with its discontinuity; in the FMS. The discontinuity is removed in order to enter the route and the required heading is not maintained after RUUDY resulting in a heading deviation.

Narrative: Prior to engine start at TEB; I was attempting to enter our cleared routing into the FMS (GNS-XLS-PRNAV). I entered the assigned departure procedure (RUUDY2 RNAV departure). After the last fix in the departure procedure; a required discontinuity line was present. In the first line after the discontinuity line; I entered the first fix for the remainder of the cleared routing (BREZY). I then attempted to enter an airway from BREZY (V39); the FMS did not recognize or accept this airway. I do not know why V39 was not recognized or accepted. I then removed BREZY from the flight plan and re-entered BREZY into the discontinuity line (the discontinuity line immediately following the departure procedure); thereby eliminating the discontinuity. In this way; V39 was now recognized and accepted by the FMS. The discontinuity was required because the departure procedure terminates with the aircraft flying a departure procedure specified heading. I was the monitoring pilot in the right seat. The procedure requires flying a heading to join a course to the first fix on the departure procedure; cross the second fix; cross the last fix; and then fly the specified heading. After takeoff we joined the course to the first departure procedure fix; while arming the NAV mode for the flying pilot so as to use the FMS for course guidance. We are based at TEB and have become accustomed to receiving an ATC vector prior to reaching the last fix on this departure procedure. Upon reaching the last fix on the departure procedure; the flying pilot turned towards BREZY (following the FMS guidance through the flight director); instead of flying the specified departure procedure heading. I am not sure if we had completed the (improper) turn (towards BREZY) or not when ATC queried where we were going. Around the same time as the query from ATC; we were reaching our assigned altitude of 7;000 FT during the level off; we momentarily allowed the aircraft to reach 7;200 FT. Things which contributed to the navigation error:1) Our failure to have a clear understanding of the departure procedure prior to departure.2) Our expectation of an ATC vector prior to the end of the departure procedure.3) The non-intuitive and possible error in the FMS that does not promote maintaining the discontinuity in the flight plan (which would have terminated FMS guidance after the last departure procedure fix).

Data retrieved from NASA's ASRS site as of April 2012 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.