A cessna 172 instructor and student pilot had a near miss with bonanza on approach to apa.

Attributes
ACN	444189
Time
Date	199907
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : apa.airport
State Reference	CO
Altitude	msl single value : 7800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : apa.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 35r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : apa.tower
Operator	general aviation : personal
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual arrival : vfr
Person 1
Affiliation	other
Function	instruction : trainee
Qualification	pilot : instrument pilot : private
ASRS Report	444189
Person 2
Affiliation	other
Function	instruction : instructor
Qualification	pilot : commercial pilot : cfi
Events
Anomaly	airspace violation : entry conflict : nmac non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 200 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was doing a practice approach to apa, ILS runway 35R, had been vectored to localizer by denver approach, was handed off to centennial tower, just about 1 mi before IAF. Tower said to continue on ILS, report at power lines (approximately 3 mi from threshold runway 35R), and that we were following a twin. I heard a bonanza call tower for instructions, and reported his location as south of airport over I25. Tower told him to continue south until given further instructions. About 30 seconds later instructor took controls and did a steep climbing left turn, while saying we had traffic. When we got straightened back out we saw it was the bonanza. I believe his call sign was xyz. The bonanza contacted tower and asked if they knew where all the traffic was in the pattern, because he about ended up wearing a C210. (Guess the C172 looks bigger up that close.) the tower told him he was cleared for runway 28. We both landed without further incident, I think the bonanza was heading about 160-150 degrees, and the controller was busy with other traffic.

Original NASA ASRS Text

Title: A CESSNA 172 INSTRUCTOR AND STUDENT PLT HAD A NEAR MISS WITH BONANZA ON APCH TO APA.

Narrative: WAS DOING A PRACTICE APCH TO APA, ILS RWY 35R, HAD BEEN VECTORED TO LOC BY DENVER APCH, WAS HANDED OFF TO CENTENNIAL TWR, JUST ABOUT 1 MI BEFORE IAF. TWR SAID TO CONTINUE ON ILS, RPT AT PWR LINES (APPROX 3 MI FROM THRESHOLD RWY 35R), AND THAT WE WERE FOLLOWING A TWIN. I HEARD A BONANZA CALL TWR FOR INSTRUCTIONS, AND RPTED HIS LOCATION AS S OF ARPT OVER I25. TWR TOLD HIM TO CONTINUE S UNTIL GIVEN FURTHER INSTRUCTIONS. ABOUT 30 SECONDS LATER INSTRUCTOR TOOK CTLS AND DID A STEEP CLBING L TURN, WHILE SAYING WE HAD TFC. WHEN WE GOT STRAIGHTENED BACK OUT WE SAW IT WAS THE BONANZA. I BELIEVE HIS CALL SIGN WAS XYZ. THE BONANZA CONTACTED TWR AND ASKED IF THEY KNEW WHERE ALL THE TFC WAS IN THE PATTERN, BECAUSE HE ABOUT ENDED UP WEARING A C210. (GUESS THE C172 LOOKS BIGGER UP THAT CLOSE.) THE TWR TOLD HIM HE WAS CLRED FOR RWY 28. WE BOTH LANDED WITHOUT FURTHER INCIDENT, I THINK THE BONANZA WAS HEADING ABOUT 160-150 DEGS, AND THE CTLR WAS BUSY WITH OTHER TFC.

Data retrieved from NASA's ASRS site as of July 2007 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.