Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 156; Flight Crew Total 4535; Flight Crew Type 1082
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Aircraft; Human Factors
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.
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.