Narrative:

I was completing my second instructional flight of the day. This was a cross country flight meant to prepare my student for his upcoming check ride. We departed and proceeded to chd; our first airport of landing. We called tower and received the following instruction: 'join left base runway 4L; report 4 miles.' we maneuvered for the base and at the appropriate distance made the requisite report. As we approached the base to final turn; my student was focused on accomplishing a procedural task. Not wanting to overshoot the centerline for fear of having to maneuver back to the runway; I told my student to stop his procedure and turn. I was also noting the TCAS showing traffic 12 o'clock and closing fast. As we turned the TCAS sounded its alert; by that point I already saw the traffic.my first thought was: 'this guy must be violating chd's class delta.' I had not picked anything up over the frequency that he was there. Nonetheless the traffic was flying parallel to me 0.2 nautical miles away at my altitude. It looked like there were two people inside; hard at work flying their plane. I called chd tower and reported that I; 'had traffic just off my right wing in-sight.' tower responded; 'roger; he is making right traffic runway 4R.'I estimate that the centerlines of the two runways at chd are approximately 1;000 ft apart. I assume the other aircraft had a true airspeed of 100 knots and that I had a true airspeed of 105 knots. This is a best case estimate as it is very easy to be going much faster. With some basic math I calculate a closure rate; head of; of 342 ft per second. Assuming then that both pilots became momentarily distracted and flew past their centerline I calculate that they would have approximately 2.9 seconds to realize their mistake.when I reported the traffic to the tower I couldn't help but to feel he was annoyed that I had even brought it up. I later had to explain the situation to my student pilot. I told him that I disagreed with the way the controller managed the situation. I told my student that this was a great lesson. I made him promise me that if he ever saw a potentially dangerous situation as a pilot; but wasn't sure if it was worth his time to warn somebody of it; that he would absolutely do the right thing. Even if he wasn't sure. After all it would have been tragic to have spent so much money on radars; control towers and radios with the idea of safety in mind; only to have a controller decide not to use those tools to help keep me safe. I want my tax money back.

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Original NASA ASRS Text

Title: Bonanza 33 flight instructor reported taking evasive action after ATC failed to notify them of traffic for a parallel runway.

Narrative: I was completing my second instructional flight of the day. This was a cross country flight meant to prepare my student for his upcoming check ride. We departed and proceeded to CHD; our first airport of landing. We called tower and received the following instruction: 'join left base runway 4L; report 4 miles.' We maneuvered for the base and at the appropriate distance made the requisite report. As we approached the base to final turn; my student was focused on accomplishing a procedural task. Not wanting to overshoot the centerline for fear of having to maneuver back to the runway; I told my student to stop his procedure and turn. I was also noting the TCAS showing traffic 12 o'clock and closing fast. As we turned the TCAS sounded its alert; by that point I already saw the traffic.My first thought was: 'this guy must be violating CHD's class delta.' I had not picked anything up over the frequency that he was there. Nonetheless the traffic was flying parallel to me 0.2 nautical miles away at my altitude. It looked like there were two people inside; hard at work flying their plane. I called CHD tower and reported that I; 'had traffic just off my right wing in-sight.' Tower responded; 'roger; he is making right traffic runway 4R.'I estimate that the centerlines of the two runways at CHD are approximately 1;000 ft apart. I assume the other aircraft had a true airspeed of 100 knots and that I had a true airspeed of 105 knots. This is a best case estimate as it is very easy to be going much faster. With some basic math I calculate a closure rate; head of; of 342 ft per second. Assuming then that both pilots became momentarily distracted and flew past their centerline I calculate that they would have approximately 2.9 seconds to realize their mistake.When I reported the traffic to the tower I couldn't help but to feel he was annoyed that I had even brought it up. I later had to explain the situation to my student pilot. I told him that I disagreed with the way the controller managed the situation. I told my student that this was a great lesson. I made him promise me that if he ever saw a potentially dangerous situation as a pilot; but wasn't sure if it was worth his time to warn somebody of it; that he would absolutely do the right thing. Even if he wasn't sure. After all it would have been tragic to have spent so much money on radars; control towers and radios with the idea of safety in mind; only to have a controller decide not to use those tools to help keep me safe. I want my tax money back.

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.