Ce-680 flight crew reported deviating from assigned altitude after receiving an RA.

Attributes
ACN	1445813
Time
Date	201705
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 135
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 14000 Flight Crew Type 700
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 75 Flight Crew Total 4000 Flight Crew Type 200
Events
Anomaly	Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude

Narrative:

During a check airman observation [flight]; we had completed a missed approach. Initial tower assignment was runway heading to 1500'. After being handed off to approach; we were given a heading of 180 and 2000'. VFR traffic was called out to our right. I saw the traffic and it appeared to be at least a mile ahead and to our right and on a parallel course. Visual contact was reported to ATC. While continuing to observe this traffic it appeared to have turned toward us at the same altitude. Closure rate seemed to be increasing rapidly and an RA warning sounded. I immediately started a descent when a second warning to 'increase rate of descent' sounded. I increased rate of descent and got a 'clear of traffic' at about 1600'. At this time; the controller asked if we had descended. I answered that we had responded to an RA. The controller replied that there was other traffic in the area. We then began and reported a climb back to 2000'.

Original NASA ASRS Text

Title: CE-680 flight crew reported deviating from assigned altitude after receiving an RA.

Narrative: During a check airman observation [flight]; we had completed a missed approach. Initial tower assignment was runway heading to 1500'. After being handed off to Approach; we were given a heading of 180 and 2000'. VFR traffic was called out to our right. I saw the traffic and it appeared to be at least a mile ahead and to our right and on a parallel course. Visual contact was reported to ATC. While continuing to observe this traffic it appeared to have turned toward us at the same altitude. Closure rate seemed to be increasing rapidly and an RA warning sounded. I immediately started a descent when a second warning to 'increase rate of descent' sounded. I increased rate of descent and got a 'clear of traffic' at about 1600'. At this time; the Controller asked if we had descended. I answered that we had responded to an RA. The Controller replied that there was other traffic in the area. We then began and reported a climb back to 2000'.

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.