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A B737 flight crew experiences a potential conflict with unrpted VFR traffic passing the localizer ahead of them while being cleared for the ILS, 11 M west of fll, fl.
| Attributes | |
| ACN | 535284 |
| Time | |
| Date | 200201 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fll.airport |
| State Reference | FL |
| Altitude | msl bound lower : 3000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia.tracon tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 9l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : mia.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 28000 flight time type : 27000 |
| ASRS Report | 535284 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 200 flight time total : 8500 flight time type : 2800 |
| ASRS Report | 535975 |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 1000 vertical : 800 |
| Supplementary | |
| Problem Areas | Airspace Structure ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure |
Narrative:
TCASII alert/confusing clearance. Clearance read, 'maintain 5000 ft to holid, cleared ILS runway 9L.' descending through +4000 ft, we got a TCASII TA. Traffic was 10 O'clock position below us. I began to level off when the controller said 'flight number, level off at 3000 ft.' since we, by then, had passed the traffic, I slowly leveled at 3000 ft to get further clearance. Radio traffic was cluttered, so I asked ATC to verify our altitude clearance. He replied 'I cleared you to 4000 ft, but you busted the altitude. Since you passed the traffic, you are reclred the ILS.' at the gate, I phoned mia approach. The supervisor listened to the tape, called me back and verified both that we had been cleared to 3000 ft and that we had legal traffic separation.
Original NASA ASRS Text
Title: A B737 FLC EXPERIENCES A POTENTIAL CONFLICT WITH UNRPTED VFR TFC PASSING THE LOC AHEAD OF THEM WHILE BEING CLRED FOR THE ILS, 11 M W OF FLL, FL.
Narrative: TCASII ALERT/CONFUSING CLRNC. CLRNC READ, 'MAINTAIN 5000 FT TO HOLID, CLRED ILS RWY 9L.' DSNDING THROUGH +4000 FT, WE GOT A TCASII TA. TFC WAS 10 O'CLOCK POS BELOW US. I BEGAN TO LEVEL OFF WHEN THE CTLR SAID 'FLT NUMBER, LEVEL OFF AT 3000 FT.' SINCE WE, BY THEN, HAD PASSED THE TFC, I SLOWLY LEVELED AT 3000 FT TO GET FURTHER CLRNC. RADIO TFC WAS CLUTTERED, SO I ASKED ATC TO VERIFY OUR ALT CLRNC. HE REPLIED 'I CLRED YOU TO 4000 FT, BUT YOU BUSTED THE ALT. SINCE YOU PASSED THE TFC, YOU ARE RECLRED THE ILS.' AT THE GATE, I PHONED MIA APCH. THE SUPVR LISTENED TO THE TAPE, CALLED ME BACK AND VERIFIED BOTH THAT WE HAD BEEN CLRED TO 3000 FT AND THAT WE HAD LEGAL TFC SEPARATION.
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.