C172 student and instructor experience a near midair collision with a cirrus in class B airspace whi...

Narrative:

My instrument student and I were flying a practice ILS approach. We were inside class B and were being vectored by approach at an altitude of 2;500 ft MSL. We were assigned a vector for the approach with the autopilot on. The air traffic controller told us to descend to 2;000 ft and then asked us to expedite for traffic. My student pressed vertical speed and the nose down button on the autopilot to start a descent. I told my student to disengage the autopilot and descend manually. I was looking outside for traffic and did not notice our rate of descent had decreased. The controller asked us again to expedite our descent and told us traffic was at our 12 o'clock heading directly toward us. I told my student to bring the power to idle and push the nose down during the time she was reading back the traffic call. The instructions from the controller and the read-back from the student took approximately 7-10 seconds. During this time a traffic alert was issued on our traffic information system (tis) display on the garmin 1000 multifunction display (mfd). I spotted the traffic as they were slightly ahead of us and about 200-300 ft above our position. They did not have any taxi lights or landing lights turned on. The controller told us traffic was climbing to 3;000 ft and was no longer a factor. We were cleared for the ILS approach and handed off to tower. The controller's instructions were a little long and my student tried to read back all instructions. I believe in this case the controller's instructions were a little too long and the read-back from my student distracted her from flying the airplane. I also should have immediately taken the controls to start the descent. The other aircraft should have turned on their landing and taxi lights in the terminal environment regardless of day or night. We had ours on.

Original NASA ASRS Text

Title: C172 Student and Instructor experience a NMAC with a Cirrus in Class B airspace while being vectored for an ILS approach for a satellite airport. The Cirrus pilot was not talking to Approach Control.

Narrative: My instrument student and I were flying a practice ILS approach. We were inside Class B and were being vectored by Approach at an altitude of 2;500 FT MSL. We were assigned a vector for the approach with the autopilot on. The Air Traffic Controller told us to descend to 2;000 FT and then asked us to expedite for traffic. My student pressed vertical speed and the nose down button on the autopilot to start a descent. I told my student to disengage the autopilot and descend manually. I was looking outside for traffic and did not notice our rate of descent had decreased. The Controller asked us again to expedite our descent and told us traffic was at our 12 o'clock heading directly toward us. I told my student to bring the power to idle and push the nose down during the time she was reading back the traffic call. The instructions from the Controller and the read-back from the student took approximately 7-10 seconds. During this time a traffic alert was issued on our Traffic Information System (TIS) display on the Garmin 1000 Multifunction Display (MFD). I spotted the traffic as they were slightly ahead of us and about 200-300 FT above our position. They did not have any taxi lights or landing lights turned on. The Controller told us traffic was climbing to 3;000 FT and was no longer a factor. We were cleared for the ILS approach and handed off to Tower. The Controller's instructions were a little long and my student tried to read back all instructions. I believe in this case the Controller's instructions were a little too long and the read-back from my student distracted her from flying the airplane. I also should have immediately taken the controls to start the descent. The other aircraft should have turned on their landing and taxi lights in the terminal environment regardless of day or night. We had ours on.

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	1036351
Time
Date	201209
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	None
Aircraft 2
Make Model Name	Cirrus Aircraft Undifferentiated
Flight Phase	Climb
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Commercial Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 190.7 Flight Crew Total 1582 Flight Crew Type 1346
Person 2
Function	Pilot Flying Trainee
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 15 Flight Crew Total 130 Flight Crew Type 20
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 50 Vertical 300

C172 student and instructor experience a near midair collision with a cirrus in class B airspace while being vectored for an ILS approach for a satellite airport. The cirrus pilot was not talking to approach control.