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An A319's autoflight system initiated an uncommanded speed change toward 285 KTS during the after takeoff climb out at 5;000 ft. Because the pilots were watching for traffic they did not see the fmgec transition to managed speed.
| Attributes | |
| ACN | 950227 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autothrottle/Speed Control |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 19000 Flight Crew Type 2000 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 110 Flight Crew Total 6300 Flight Crew Type 1270 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Track / Heading All Types |
Narrative:
At 3;500 ft; in the process of accelerating to 250 KTS; ATC called traffic at 2 o'clock. I scanned the airspeed and saw 220 KTS accelerating. I then scanned outside for traffic. Scanned inside again and saw magenta selected speed indicator with actual speed 40 KTS below selected at approximately 5;000 ft scanned outside again for traffic. Brought scan back inside for speed and noticed the speed triangle was at 280 KTS in managed below 10;000. Airspeed was increasing through 270 KTS. I pulled aft stick to dissipate airspeed. I then told first officer to select 250 KTS on MCP. Airspeed excess was momentary. Maintenance was notified and a bit test was done at our destination. I do not know the outcome of that test.
Original NASA ASRS Text
Title: An A319's autoflight system initiated an uncommanded speed change toward 285 KTS during the after takeoff climb out at 5;000 FT. Because the pilots were watching for traffic they did not see the FMGEC transition to managed speed.
Narrative: At 3;500 FT; in the process of accelerating to 250 KTS; ATC called traffic at 2 o'clock. I scanned the airspeed and saw 220 KTS accelerating. I then scanned outside for traffic. Scanned inside again and saw magenta selected speed indicator with actual speed 40 KTS below selected at approximately 5;000 FT scanned outside again for traffic. Brought scan back inside for speed and noticed the speed triangle was at 280 KTS in managed below 10;000. Airspeed was increasing through 270 KTS. I pulled aft stick to dissipate airspeed. I then told First Officer to select 250 KTS on MCP. Airspeed excess was momentary. Maintenance was notified and a bit test was done at our destination. I do not know the outcome of that test.
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.