An embraer phenom pilot was flying an approach that had stepdown fixes. Pilot said that ...'the VNAV...

Attributes
ACN	1252225
Time
Date	201504
Local Time Of Day	1201-1800
Place
Locale Reference	ZSE.ARTCC
State Reference	WA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Embraer Phenom 100
Operating Under FAR Part	Part 135
Flight Phase	Initial Approach
Route In Use	STAR HHOOD2
Flight Plan	IFR
Person 1
Function	Captain Single Pilot Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 45 Flight Crew Total 5000 Flight Crew Type 300
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance

Narrative:

I was flying the HHOOD2 arrival. The crossing restriction at rabbi is FL240 or below and 13.1 miles later at hhood it is 10;000 feet. My aircraft does not look at the entire arrival and consider all crossing restrictions. Instead; it only looks at the one directly in front of it and calculates to the lowest listed altitude. Therefore; it does not recognize that it can be lower than FL240 at rabbi.after passing rabbi; it stopped descending and I realized that there would be no way I could descend 14;000 feet in 13 miles. I should have looked ahead at each restriction to catch this kind of situation. ATC turned me off the approach as I would have missed the crossing restriction by a few thousand feet. The VNAV system in this aircraft does not work well with these new 'descend via...' clearances. I have to be more vigilant in catching these situations where I will have to manually calculate descent paths; especially because I am single pilot.

Original NASA ASRS Text

Title: An Embraer Phenom pilot was flying an approach that had stepdown fixes. Pilot said that ...'The VNAV system in this aircraft does not work well with these new 'descend via...' clearances.' because the system only looks at the upcoming fix and not fix altitudes further along the arrival. As a result she was unable to make a crossing restriction and was then vectored off the arrival by ATC.

Narrative: I was flying the HHOOD2 arrival. The crossing restriction at RABBI is FL240 or below and 13.1 miles later at HHOOD it is 10;000 feet. My aircraft does not look at the entire arrival and consider all crossing restrictions. Instead; it only looks at the one directly in front of it and calculates to the lowest listed altitude. Therefore; it does not recognize that it can be lower than FL240 at RABBI.After passing RABBI; it stopped descending and I realized that there would be no way I could descend 14;000 feet in 13 miles. I should have looked ahead at each restriction to catch this kind of situation. ATC turned me off the approach as I would have missed the crossing restriction by a few thousand feet. The VNAV system in this aircraft does not work well with these new 'descend via...' clearances. I have to be more vigilant in catching these situations where I will have to manually calculate descent paths; especially because I am single pilot.

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.