EMB145 captain at 11;000 feet reports and airborne conflict with VFR traffic instructed by ATC to st...

Narrative:

We were in level cruise flight and were at 11;000 feet. ATC issued a descent clearance to another airplane; to stop his descent at 11;500 from 12;500 and issued a traffic report to us and them. The other pilot acknowledged the clearance to stop his descent at 11;500. We reported we were looking for traffic; but he was right above us so we never saw him at all. Soon after we got an RA to monitor vertical speed. The first officer disconnected the autopilot and pushed the nose down to follow the RA. The airplane above us continued his descent and the RA wanted full down vs; at which time I took the controls and pushed down further. I advised the controller of this and then continued back up to 11;000 feet when we were clear of traffic. I told the controller that the airplane came within 200 feet vertical (was in red 02= within 200 ft) of us. The other pilot said in a not so nice way that we were wrong and that our TCAS was wrong. I asked for an 800 number to call. I called and talked to a controller; who had talked to the controller handling our flight. He said the controller had turned away from his screen and that the other pilot continued his descent through 11;500 into our altitude.

Original NASA ASRS Text

Title: EMB145 Captain at 11;000 feet reports and airborne conflict with VFR traffic instructed by ATC to stop descent at 11;500 feet. The VFR traffic continues descent causing a descend RA for the EMB145 crew.

Narrative: We were in level cruise flight and were at 11;000 feet. ATC issued a descent clearance to another airplane; to stop his descent at 11;500 from 12;500 and issued a traffic report to us and them. The other pilot acknowledged the clearance to stop his descent at 11;500. We reported we were looking for traffic; but he was right above us so we never saw him at all. Soon after we got an RA to monitor vertical speed. The First Officer disconnected the autopilot and pushed the nose down to follow the RA. The airplane above us continued his descent and the RA wanted full down VS; at which time I took the controls and pushed down further. I advised the Controller of this and then continued back up to 11;000 feet when we were clear of traffic. I told the Controller that the airplane came within 200 feet vertical (was in red 02= within 200 ft) of us. The other pilot said in a not so nice way that we were wrong and that our TCAS was wrong. I asked for an 800 number to call. I called and talked to a Controller; who had talked to the Controller handling our flight. He said the Controller had turned away from his screen and that the other pilot continued his descent through 11;500 into our altitude.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1119273
Time
Date	201309
Local Time Of Day	1201-1800
Place
Locale Reference	ZDC.ARTCC
State Reference	VA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude

EMB145 captain at 11;000 feet reports and airborne conflict with VFR traffic instructed by ATC to stop descent at 11;500 feet. The VFR traffic continues descent causing a descend RA for the EMB145 crew.