An A319 flight crew switched air data computers in response to engine surges and erratic navigation ...

Attributes
ACN	956381
Time
Date	201106
Local Time Of Day	0001-0600
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Data Computer
Person 1
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 17800 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

In cruise at FL340 with autopilot on we noticed a sudden engine surge followed by the first officer's navigation display jumping erratically. We switched from autopilot 2 to autopilot 1 and switched air data to first officer 3 which stopped erratic display and engine surge. Then we began to get ECAM overspeed warnings intermittently. This continued until we descended to FL300 and FL280 since we were no longer rvsm capable. We continued the flight with manual autothrottles and autopilot 1 engaged. No further issues were noted and we notified dispatch and maintenance control of all information and were told [we were] ok to continue.

Original NASA ASRS Text

Title: An A319 flight crew switched air data computers in response to engine surges and erratic Navigation Displays. They then descended out of RVSM airspace and continued to their destination.

Narrative: In cruise at FL340 with autopilot on we noticed a sudden engine surge followed by the First Officer's Navigation Display jumping erratically. We switched from autopilot 2 to autopilot 1 and switched air data to First Officer 3 which stopped erratic display and engine surge. Then we began to get ECAM overspeed warnings intermittently. This continued until we descended to FL300 and FL280 since we were no longer RVSM capable. We continued the flight with manual autothrottles and autopilot 1 engaged. No further issues were noted and we notified Dispatch and Maintenance Control of all information and were told [we were] ok to continue.

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.

An A319 flight crew switched air data computers in response to engine surges and erratic navigation displays. They then descended out of rvsm airspace and continued to their destination.