<< >> NASA ASRS Report 1634589, April 2019

B737 ng flight crew reported a track deviation occurred on the RNAV (rnp) Z approach to 35R in den when they failed to notice a discontinuity in the FMC programmed route.

Attributes
ACN	1634589
Time
Date	201904
Local Time Of Day	1201-1800
Place
Locale Reference	DEN.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial
Experience	Flight Crew Last 90 Days 189 Flight Crew Type 2422
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 117 Flight Crew Type 1702
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Just prior to the IAF on RNAV (rnp) Z runway 35R; I thought I heard (and read back) 'expect RNAV 35R.' I then queried whether ATC said cleared the approach; to which they answered 'affirmative; cleared the approach.' we set the final approach fix altitude and just as we were passing the IAF noticed that we had not closed the discontinuity between the arrival and the approach. The aircraft did not follow the lateral line of the approach and we requested vectors for final. The remainder of the approach and landing was uneventful.

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Original NASA ASRS Text

Title: B737 NG flight crew reported a track deviation occurred on the RNAV (RNP) Z approach to 35R in DEN when they failed to notice a discontinuity in the FMC programmed route.

Narrative: Just prior to the IAF on RNAV (RNP) Z Runway 35R; I thought I heard (and read back) 'Expect RNAV 35R.' I then queried whether ATC said cleared the approach; to which they answered 'Affirmative; cleared the approach.' We set the final approach fix altitude and just as we were passing the IAF noticed that we had not closed the discontinuity between the arrival and the approach. The aircraft did not follow the lateral line of the approach and we requested vectors for final. The remainder of the approach and landing was uneventful.

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.