Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 400; Flight Crew Total 1420; Flight Crew Type 1000
Other / Unknown
Conflict Airborne Conflict
Flight Crew Took Evasive Action
Human Factors; Procedure; Airspace Structure
I was on an IFR flight with a student heading into Atlantic city airport.  We requested the GPS 4 approach into the airport.  The controller told us to cross JEDOB at 2000 and we were cleared for the approach.  We crossed JEDOB intersection and started our descent down to 1700 feet as the approach calls for.  My student was under the foggles and I was looking outside for traffic.  We were currently out of the clouds in VMC conditions.  I noticed and aircraft moving left to right at a high rate of speed and had very little time to react.  It came within approximately 500 feet horizontally and 100 feet vertically of our aircraft. I immediately took evasive action and descended.  There was no report of the aircraft from air traffic control.  I asked the controller if she was showing an aircraft near us and she then responded affirmative and pointed it out and asked if we had the traffic in sight.  I told her affirmative and that it was a close call.  I believe the incident occurred in class C airspace but depending on where we were on the approach it could have been right outside in class E airspace.  Regardless we were on and IFR flight plan and were given an approach clearance.  In addition our aircraft was to the right of the other aircraft and legally we had the right away. I don't know if the controller was working the other aircraft or if it popped up on radar at the last minute.  If she was working that aircraft I think she needed to a better job monitoring the situation; given how close both our aircraft came.
C152 Flight Instructor reports an airborne conflict with another aircraft requiring evasive action. The reporter had just been cleared for the GPS 4 approach to Runway 4 at ACY and was out of 2;000 feet for 1;700 feet. ATC apparently saw the other aircraft but did not provide a warning.