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Air carrier first officer reported a track deviation occurred on the RNAV rnp Z approach to 34R at den when the autopilot failed to maintain the programmed track.
| Attributes | |
| ACN | 1633407 |
| Time | |
| Date | 201904 |
| Place | |
| Locale Reference | DEN.Airport |
| State Reference | CO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Widebody Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 156 Flight Crew Total 4535 Flight Crew Type 1082 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
Flying the RNAV rnp Z rwy 34R; at himom; autopilot on; the aircraft maintained 11;000 feet and did not turn for the approach. We had programmed the approach and checked that all points were in the system. We had LNAV and VNAV selected with 7;000 feet for the next altitude in the window. When the plane didn't turn I clicked off the autopilot to correct the course and start descent; but the controller told us to maintain heading and then vectored us for the visual approach 34R.
Original NASA ASRS Text
Title: Air carrier First Officer reported a track deviation occurred on the RNAV RNP Z Approach to 34R at DEN when the autopilot failed to maintain the programmed track.
Narrative: Flying the RNAV RNP Z Rwy 34R; at HIMOM; autopilot on; the aircraft maintained 11;000 feet and did not turn for the approach. We had programmed the approach and checked that all points were in the system. We had LNAV and VNAV selected with 7;000 feet for the next altitude in the window. When the plane didn't turn I clicked off the autopilot to correct the course and start descent; but the controller told us to maintain heading and then vectored us for the Visual Approach 34R.
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.