An air carrier crew entered the FMS ANCHR3 arrival and to expect runway 35R RNAV rnpz but mistakenly...

Narrative:

Descending via ANCHR3 arrival into den expecting runway 35R. Several approach clearance changes inbound (runway changed from 16 to 35) changed to anchr arrival. We reprogrammed the FMC and set up for the ANCHR3 followed by visual approach to 35R backed up by the ILS. Approaching doggg; we were cleared for the RNAV rnpz approach to 35R. We quickly pulled up the new approach on our efb and I intended to enter the 35R rnp Z approach into the FMC but inadvertently selected the 34R rnp Z approach without realizing it. I quickly briefed the points while selecting .3RNP; but we were VMC with the field in sight; being instructed to slow to 170 knots getting traffic point outs and configuring with gear and flaps to slow down. The first two points are the same for both approaches (doggg and msims) before the 34R approach continues west across the 35L approach corridor to a final on 34R. We didn't catch the error and continued to configure. As we approached the centerline for 35R; it didn't appear that the plane was turning so I disengaged the autopilot and took over visually to not overshoot continuing to a normal landing. In retrospect; I believe the end game visual approach closely tracked both vertical and lateral course of the rnp approach. However; there was traffic on final to 35L and if we had not noticed the error and intervened; we could have easily caused a conflict

Original NASA ASRS Text

Title: An air carrier crew entered the FMS ANCHR3 arrival and to expect Runway 35R RNAV RNPZ but mistakenly entered Runway 34R. After a TA alert; they flew the remainder of the 35R approach visually and landed uneventfully.

Narrative: Descending via ANCHR3 Arrival into DEN expecting Runway 35R. Several approach clearance changes inbound (runway changed from 16 to 35) changed to ANCHR Arrival. We reprogrammed the FMC and set up for the ANCHR3 followed by visual approach to 35R backed up by the ILS. Approaching DOGGG; we were cleared for the RNAV RNPZ approach to 35R. We quickly pulled up the new approach on our EFB and I intended to enter the 35R RNP Z approach into the FMC but inadvertently selected the 34R RNP Z approach without realizing it. I quickly briefed the points while selecting .3RNP; but we were VMC with the field in sight; being instructed to slow to 170 knots getting traffic point outs and configuring with gear and flaps to slow down. The first two points are the same for both approaches (DOGGG and MSIMS) before the 34R approach continues W across the 35L approach corridor to a final on 34R. We didn't catch the error and continued to configure. As we approached the centerline for 35R; it didn't appear that the plane was turning so I disengaged the autopilot and took over visually to not overshoot continuing to a normal landing. In retrospect; I believe the end game visual approach closely tracked both vertical and lateral course of the RNP approach. However; there was traffic on final to 35L and if we had not noticed the error and intervened; we could have easily caused a conflict

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.

Attributes
ACN	1228557
Time
Date	201412
Local Time Of Day	0601-1200
Place
Locale Reference	DEN.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR ANCHR3
Flight Plan	IFR
Component
Aircraft Component	Autoflight System
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 169
Person 2
Function	Pilot Not Flying Captain
Experience	Flight Crew Last 90 Days 176 Flight Crew Type 11000
Events
Anomaly	Aircraft Equipment Problem Less Severe Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Track / Heading All Types
Miss Distance	Vertical 300

An air carrier crew entered the FMS ANCHR3 arrival and to expect runway 35R RNAV rnpz but mistakenly entered runway 34R. After a TA alert; they flew the remainder of the 35R approach visually and landed uneventfully.