B737-800
Flight Crew Air Transport Pilot (ATP)
Confusion; Distraction; Human-Machine Interface; Situational Awareness; Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Flight Crew Became Reoriented; Flight Crew Returned To Clearance; Flight Crew Took Evasive Action
Human Factors; Aircraft
[I was] arriving in DFW via the Cedar Creek arrival to land on 17L. I reselected 17L and did not know it caused a discontinuity after DIETZ. Aircraft did not turn north so my First Officer immediately turned right to get back on course. I was unaware that the arrival would drop off when reselecting a runway in DFW. I need to pay attention.
A B737-800 Captain on the DFW Cedar Creek Six Arrival reselected Runway 17L but did not know and failed to see that his action caused a FMC route discontinuity.