Near midair collision. A training flight is overtaken on final by another aircraft making an approac...

Attributes
ACN	304938
Time
Date	199505
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ads
State Reference	TX
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ads
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual approach : straight in
Flight Plan	None
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : straight in
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 65 flight time total : 1000 flight time type : 200
ASRS Report	304938
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

Near completion of routine training flight, we requested and received clearance for a practice ILS runway 15 approach to addison airport. We were given a squawk code and told to report at the OM inbound. We subsequently reported to the tower that we were over bronze (OM) and were cleared to land. Traffic volume was very heavy at this time and 1-2 mins after we reported at bronze, another aircraft reported at bronze. Addison tower then asked us where we were. We reported that we were inside bronze OM. A few seconds later while still on descent approximately 2 mi from the runway, an aircraft passed directly below us, also on approach to land. At this point we applied full power and initiated a turning climb, narrowly avoiding contact with the other aircraft. After landing we called addison tower and asked if they knew what happened. We were advised that when 2 aircraft get very close together it can appear as one on the radar. They were apparently aware of the near miss incident and would not elaborate further. I have to presume that the aircraft that passed under us was the same one that reported at the OM just behind us, ie, on the runway centerline. If an aircraft is lined up on approach to the runway as we were, how could they not see another aircraft (us) directly in front and only slightly above their altitude? I have requested the tower tapes in an attempt to answer this question.

Original NASA ASRS Text

Title: NMAC. A TRAINING FLT IS OVERTAKEN ON FINAL BY ANOTHER ACFT MAKING AN APCH TO THE SAME RWY.

Narrative: NEAR COMPLETION OF ROUTINE TRAINING FLT, WE REQUESTED AND RECEIVED CLRNC FOR A PRACTICE ILS RWY 15 APCH TO ADDISON ARPT. WE WERE GIVEN A SQUAWK CODE AND TOLD TO RPT AT THE OM INBOUND. WE SUBSEQUENTLY RPTED TO THE TWR THAT WE WERE OVER BRONZE (OM) AND WERE CLRED TO LAND. TFC VOLUME WAS VERY HVY AT THIS TIME AND 1-2 MINS AFTER WE RPTED AT BRONZE, ANOTHER ACFT RPTED AT BRONZE. ADDISON TWR THEN ASKED US WHERE WE WERE. WE RPTED THAT WE WERE INSIDE BRONZE OM. A FEW SECONDS LATER WHILE STILL ON DSCNT APPROX 2 MI FROM THE RWY, AN ACFT PASSED DIRECTLY BELOW US, ALSO ON APCH TO LAND. AT THIS POINT WE APPLIED FULL PWR AND INITIATED A TURNING CLB, NARROWLY AVOIDING CONTACT WITH THE OTHER ACFT. AFTER LNDG WE CALLED ADDISON TWR AND ASKED IF THEY KNEW WHAT HAPPENED. WE WERE ADVISED THAT WHEN 2 ACFT GET VERY CLOSE TOGETHER IT CAN APPEAR AS ONE ON THE RADAR. THEY WERE APPARENTLY AWARE OF THE NEAR MISS INCIDENT AND WOULD NOT ELABORATE FURTHER. I HAVE TO PRESUME THAT THE ACFT THAT PASSED UNDER US WAS THE SAME ONE THAT RPTED AT THE OM JUST BEHIND US, IE, ON THE RWY CTRLINE. IF AN ACFT IS LINED UP ON APCH TO THE RWY AS WE WERE, HOW COULD THEY NOT SEE ANOTHER ACFT (US) DIRECTLY IN FRONT AND ONLY SLIGHTLY ABOVE THEIR ALT? I HAVE REQUESTED THE TWR TAPES IN AN ATTEMPT TO ANSWER THIS QUESTION.

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.

Near midair collision. A training flight is overtaken on final by another aircraft making an approach to the same runway.