EMB145 flight crew reported a possible drone sighting at 3;000 feet over doogy on approach to ord ru...

Attributes
ACN	1370512
Time
Date	201607
Local Time Of Day	1201-1800
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	UAV - Unpiloted Aerial Vehicle
Flight Phase	Cruise
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Vertical 400

Narrative:

We were on final approach for 9L over doogy at 3000 feet we got a traffic alert and then a monitor vertical speed for traffic below us at 2;500 feet. We did not get a climb or descent; we did not deviate from anything assigned to us. But we did report to chicago tower that there was a drone below our aircraft.the only threat we had was that we could have possibly collided with the drone and possibly an unstable approach from trying to find the drone and trying to figure out what it was but we did not have any errors associated with this situation.

Original NASA ASRS Text

Title: EMB145 flight crew reported a possible drone sighting at 3;000 feet over DOOGY on approach to ORD Runway 9L. A TCAS RA was generated to; 'Monitor Vertical Speed' for the traffic 500 feet below.

Narrative: We were on final approach for 9L over DOOGY at 3000 feet we got a traffic alert and then a monitor vertical speed for traffic below us at 2;500 feet. We did not get a climb or descent; we did not deviate from anything assigned to us. But we did report to Chicago tower that there was a drone below our aircraft.The only threat we had was that we could have possibly collided with the drone and possibly an unstable approach from trying to find the drone and trying to figure out what it was but we did not have any errors associated with this situation.

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.

EMB145 flight crew reported a possible drone sighting at 3;000 feet over doogy on approach to ord runway 9L. A TCAS RA was generated to; 'monitor vertical speed' for the traffic 500 feet below.