Air carrier flight crew reported that while descending on the JANNY3 arrival into bur with LNAV/VNAV...

Attributes
ACN	1439408
Time
Date	201704
Place
Locale Reference	BUR.Airport
State Reference	CA
Environment
Light	Night
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR JANNY3
Flight Plan	IFR
Component
Aircraft Component	Autoflight System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 208
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 155 Flight Crew Type 13600
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance

Narrative:

On the JANNY3 arrival we leveled at FL240 passing the joees waypoint. As the aircraft started to descend to meet the dnutt FL230 restriction it started to level off at FL23.8 then start down again. This put us off path. I selected vertical speed to try to make the restriction but was unable to make it and crossed it about 500 feet high. I'm not sure why the aircraft did not make the restriction. I felt like the arrival was correctly programmed. The bad part of having an arrival with 1000 foot step down between points is that if there is any problem; you have no room to correct the error and still make the restriction with only three miles between descent point and crossing altitude restriction.

Original NASA ASRS Text

Title: Air Carrier flight crew reported that while descending on the JANNY3 Arrival into BUR with LNAV/VNAV engaged; the aircraft leveled momentarily resulting in crossing DNUTT 500 feet high.

Narrative: On the JANNY3 Arrival we leveled at FL240 passing the JOEES waypoint. As the aircraft started to descend to meet the DNUTT FL230 restriction it started to level off at FL23.8 then start down again. This put us off path. I selected Vertical Speed to try to make the restriction but was unable to make it and crossed it about 500 feet high. I'm not sure why the aircraft did not make the restriction. I felt like the arrival was correctly programmed. The bad part of having an arrival with 1000 foot step down between points is that if there is any problem; you have no room to correct the error and still make the restriction with only three miles between descent point and crossing altitude restriction.

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.

Air carrier flight crew reported that while descending on the JANNY3 arrival into bur with LNAV/VNAV engaged; the aircraft leveled momentarily resulting in crossing dnutt 500 feet high.