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.

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Attributes
ACN	1039543
Time
Date	201209
Local Time Of Day	0601-1200
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR CEDAR CREEK SIX
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

[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.

Original NASA ASRS Text

Title: 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.

Narrative: [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.

Data retrieved from NASA's ASRS site as of July 2013 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.