A319 first officer reported a flap overspeed occurred on approach into ord when they encountered eit...

Attributes
ACN	1631359
Time
Date	201903
Local Time Of Day	1201-1800
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Flight Phase	Final Approach
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 195 Flight Crew Type 1211
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Wake Vortex Encounter Inflight Event / Encounter Weather / Turbulence

Narrative:

On ILS prm (precision runway monitor) approach ord 10C (autopilot and autothrust required); assigned 170 KIAS to FAF (final approach fix). I called 'flaps 3' below 175 KIAS to maintain 170. Just prior to the FAF; the aircraft encountered either wake turbulence from the proceeding aircraft or some other form of unstable air. The airspeed quickly rose above the flaps 3 limit of the aircraft. During our debrief; the captain and I thought it was about 10 knots above the limit for 2 to 3 seconds. I called for the landing gear to help manage the speed. Airspeed returned to normal; we continued to configure for landing; and landed uneventfully. The captain contacted maintenance to write up the overspeed. Maintenance did the inspection and reported to us the overspeed was within limits.

Original NASA ASRS Text

Title: A319 First Officer reported a flap overspeed occurred on approach into ORD when they encountered either wake turbulence or unstable air.

Narrative: On ILS PRM (Precision Runway Monitor) approach ORD 10C (autopilot and autothrust required); assigned 170 KIAS to FAF (Final Approach Fix). I called 'Flaps 3' below 175 KIAS to maintain 170. Just prior to the FAF; the aircraft encountered either wake turbulence from the proceeding aircraft or some other form of unstable air. The airspeed quickly rose above the Flaps 3 limit of the aircraft. During our debrief; the Captain and I thought it was about 10 knots above the limit for 2 to 3 seconds. I called for the landing gear to help manage the speed. Airspeed returned to normal; we continued to configure for landing; and landed uneventfully. The Captain contacted Maintenance to write up the overspeed. Maintenance did the inspection and reported to us the overspeed was within limits.

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.

A319 first officer reported a flap overspeed occurred on approach into ord when they encountered either wake turbulence or unstable air.