An A319's autopilot reverted to open descent as it began a transition to 250 kts approaching a 10;000' arrival constraint and descended to 9;700' before climbing back to the clearance altitude.

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Attributes
ACN	956780
Time
Date	201106
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Altitude Hold/Capture
Person 1
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 14000 Flight Crew Type 8000
Person 2
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 26000 Flight Crew Type 3500
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance

Narrative:

1.5 NM north east of an arrival fix we were on descent; the plane reverted into an open descent and did not level at 10;000' at the constraint. We caught the altitude at 9700' 1.4 nm north of the fix at 250 kts. ATC contacted us for our altitude; we stated 9;700' and climbed back to 10000'.

Original NASA ASRS Text

Title: An A319's autopilot reverted to Open Descent as it began a transition to 250 kts approaching a 10;000' arrival constraint and descended to 9;700' before climbing back to the clearance altitude.

Narrative: 1.5 NM north east of an arrival fix we were on descent; the plane reverted into an open descent and did not level at 10;000' at the constraint. We caught the altitude at 9700' 1.4 nm north of the fix at 250 kts. ATC contacted us for our altitude; we stated 9;700' and climbed back to 10000'.

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.