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A civil air patrol C172 has an near midair collision with an unidented aircraft passing under the base of the dfw class B airspace. Aircraft Y was in ads airport class D airspace, just 50 ft below aircraft X. No TA, no comment from dfw approach controller.
| Attributes | |
| ACN | 371473 |
| Time | |
| Date | 199706 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ads |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | other |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 35 flight time total : 900 flight time type : 500 |
| ASRS Report | 371473 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : nmac non adherence : far non adherence : published procedure other anomaly other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 75 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
I was flying civil air patrol, a C172 under an IFR flight plan from gpm to ads. WX was VMC. My last instruction from dallas regional approach was to fly a heading of 330 degrees and maintain an altitude of 3000 ft until I turned base for runway 15 at ads. My position was about 1/2 mi from ads and abeam of the runway 15 end, ie, I was on a 3000 ft high downwind for runway 15. My altitude was within 5-10 ft of my assigned altitude. At that time I observed a low-wing, single engine, probably 4 seat plane cross my path around 50 ft lower than my aircraft and maybe 200 ft ahead. The plane crossed from left to right. It was on a heading of approximately 360 degrees to 010 degrees. There were no TA's. I mentioned to dallas approach that a plane had passed very close to me. There was no reply. Note: I was in class B airspace. 3000 ft was the bottom of it. At approximately 2925-2950 ft the other plane was in addison airspace.
Original NASA ASRS Text
Title: A CIVIL AIR PATROL C172 HAS AN NMAC WITH AN UNIDENTED ACFT PASSING UNDER THE BASE OF THE DFW CLASS B AIRSPACE. ACFT Y WAS IN ADS ARPT CLASS D AIRSPACE, JUST 50 FT BELOW ACFT X. NO TA, NO COMMENT FROM DFW APCH CTLR.
Narrative: I WAS FLYING CIVIL AIR PATROL, A C172 UNDER AN IFR FLT PLAN FROM GPM TO ADS. WX WAS VMC. MY LAST INSTRUCTION FROM DALLAS REGIONAL APCH WAS TO FLY A HEADING OF 330 DEGS AND MAINTAIN AN ALT OF 3000 FT UNTIL I TURNED BASE FOR RWY 15 AT ADS. MY POS WAS ABOUT 1/2 MI FROM ADS AND ABEAM OF THE RWY 15 END, IE, I WAS ON A 3000 FT HIGH DOWNWIND FOR RWY 15. MY ALT WAS WITHIN 5-10 FT OF MY ASSIGNED ALT. AT THAT TIME I OBSERVED A LOW-WING, SINGLE ENG, PROBABLY 4 SEAT PLANE CROSS MY PATH AROUND 50 FT LOWER THAN MY ACFT AND MAYBE 200 FT AHEAD. THE PLANE CROSSED FROM L TO R. IT WAS ON A HEADING OF APPROX 360 DEGS TO 010 DEGS. THERE WERE NO TA'S. I MENTIONED TO DALLAS APCH THAT A PLANE HAD PASSED VERY CLOSE TO ME. THERE WAS NO REPLY. NOTE: I WAS IN CLASS B AIRSPACE. 3000 FT WAS THE BOTTOM OF IT. AT APPROX 2925-2950 FT THE OTHER PLANE WAS IN ADDISON AIRSPACE.
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.