<< >> NASA ASRS Report 929622, January 2011

A320 flight crew missed a crossing restriction during descent on the watsn 1 RNAV arrival to ord due to the vagaries of the A320 auto flight system.

Attributes
ACN	929622
Time
Date	201101
Local Time Of Day	1201-1800
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 120 Flight Crew Total 18800 Flight Crew Type 2000
Person 2
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 225 Flight Crew Total 12000 Flight Crew Type 3500
Events
Anomaly	ATC Issue All Types Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance

Narrative:

The clearance was to descend to 13000 and expect 12000 at prise. We leveled at 13000. There was a controller change; and the next clearance was to cross prise at 12000; just as we expected. The clearance came close to wastn and the aircraft automation was slow to push the nose over. I was unable to get relief from the clearance due to congestion on the frequency. We crossed the fix 600 feet high.

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Original NASA ASRS Text

Title: A320 flight crew missed a crossing restriction during descent on the WATSN 1 RNAV arrival to ORD due to the vagaries of the A320 auto flight system.

Narrative: The clearance was to descend to 13000 and expect 12000 at PRISE. We leveled at 13000. There was a controller change; and the next clearance was to cross PRISE at 12000; just as we expected. The clearance came close to WASTN and the aircraft automation was slow to push the nose over. I was unable to get relief from the clearance due to congestion on the frequency. We crossed the fix 600 feet high.

Data retrieved from NASA's ASRS site as of April 2012 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.