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Near midair collision between a B737 on a 10 mi final visual approach and a cessna 172 not in communications with approach controller in class B airspace. Approach controller separated traffic by climbing the reporter's aircraft.
| Attributes | |
| ACN | 536466 |
| Time | |
| Date | 200201 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw.airport |
| State Reference | MI |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d21.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 22r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 72 flight time total : 8000 flight time type : 67 |
| ASRS Report | 536466 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | airspace violation : entry conflict : nmac non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory controller : separated traffic |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Just prior to occurrence we were being vectored for ILS runway 22R dtw. We were on a 090 degree heading at 4000 ft 170 KTS assigned. We were instructed to turn right heading 200 degrees descend to 3000 ft and accelerate to 180 KTS, intercept the localizer, which we did. We were asked do you have the airport. We said, runway 22R in sight at which time we were cleared for the visual. The approach controller said you have traffic at 1 O'clock position and 4 mi. We did not have traffic in sight reported looking. A few seconds later ATC instructed us to climb to 3500 ft to avoid traffic. He stated, he was not in communication with traffic and it was unknown to him. The traffic was a C172. We had the traffic in sight as it passed underneath. At the moment of the occurrence we were within the 11 DME arc for dtw where the base of class B airspace was 3000 ft. I believe the cessna aircraft had been off course slightly and entered the bottom of dtw class B airspace. The dtw approach controller did an excellent job to avoid a possible near miss/hit or a TCASII TA/RA. A possible solution to fix this occurrence besides aircraft (non radar) staying out of class B airspace, would be to have aircraft approaching dtw airport to intercept the GS at a slightly higher altitude than the bases of dtw's class B airspace.
Original NASA ASRS Text
Title: NMAC BTWN A B737 ON A 10 MI FINAL VISUAL APCH AND A CESSNA 172 NOT IN COMS WITH APCH CTLR IN CLASS B AIRSPACE. APCH CTLR SEPARATED TFC BY CLBING THE RPTR'S ACFT.
Narrative: JUST PRIOR TO OCCURRENCE WE WERE BEING VECTORED FOR ILS RWY 22R DTW. WE WERE ON A 090 DEG HDG AT 4000 FT 170 KTS ASSIGNED. WE WERE INSTRUCTED TO TURN R HEADING 200 DEGS DSND TO 3000 FT AND ACCELERATE TO 180 KTS, INTERCEPT THE LOC, WHICH WE DID. WE WERE ASKED DO YOU HAVE THE ARPT. WE SAID, RWY 22R IN SIGHT AT WHICH TIME WE WERE CLRED FOR THE VISUAL. THE APCH CTLR SAID YOU HAVE TFC AT 1 O'CLOCK POS AND 4 MI. WE DID NOT HAVE TFC IN SIGHT RPTED LOOKING. A FEW SECONDS LATER ATC INSTRUCTED US TO CLB TO 3500 FT TO AVOID TFC. HE STATED, HE WAS NOT IN COM WITH TFC AND IT WAS UNKNOWN TO HIM. THE TFC WAS A C172. WE HAD THE TFC IN SIGHT AS IT PASSED UNDERNEATH. AT THE MOMENT OF THE OCCURRENCE WE WERE WITHIN THE 11 DME ARC FOR DTW WHERE THE BASE OF CLASS B AIRSPACE WAS 3000 FT. I BELIEVE THE CESSNA ACFT HAD BEEN OFF COURSE SLIGHTLY AND ENTERED THE BOTTOM OF DTW CLASS B AIRSPACE. THE DTW APCH CTLR DID AN EXCELLENT JOB TO AVOID A POSSIBLE NEAR MISS/HIT OR A TCASII TA/RA. A POSSIBLE SOLUTION TO FIX THIS OCCURRENCE BESIDES ACFT (NON RADAR) STAYING OUT OF CLASS B AIRSPACE, WOULD BE TO HAVE ACFT APCHING DTW ARPT TO INTERCEPT THE GS AT A SLIGHTLY HIGHER ALT THAN THE BASES OF DTW'S CLASS B 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.