B737NG captain reported failure to make a crossing restriction on the RNAV rnp Z 34R approach to den...

Attributes
ACN	1578989
Time
Date	201809
Local Time Of Day	0001-0600
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	Descent
Route In Use	STAR FRNCH 3
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 220 Flight Crew Total 27600 Flight Crew Type 15000
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Undershoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

While descending into den on the frnch 3; when we checked in with den approach; our expected approach and landing runway was changed to the RNAV rnp Z 34R (from ILS 35L). As we approached dorke; I began loading the approach and conducting the approaching briefing - failing to notice that VNAV had switched from VNAV path to VNAV speed. It was just as we neared dorke (at or below 17000 ft - at or above 15000 ft) that I noticed that we were about 800 feet above the VNAV path and nearing dorke. I deployed the speed brakes; but we passed dorke at 17500 ft - 500 ft too high.

Original NASA ASRS Text

Title: B737NG Captain reported failure to make a crossing restriction on the RNAV RNP Z 34R approach to DEN.

Narrative: While descending into DEN on the FRNCH 3; when we checked in with DEN Approach; our expected approach and landing runway was changed to the RNAV RNP Z 34R (from ILS 35L). As we approached DORKE; I began loading the approach and conducting the approaching briefing - failing to notice that VNAV had switched from VNAV PATH to VNAV SPD. It was just as we neared DORKE (At or Below 17000 FT - At or Above 15000 FT) that I noticed that we were about 800 feet above the VNAV Path and nearing DORKE. I deployed the speed brakes; but we passed DORKE at 17500 FT - 500 FT too high.

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.