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D10 controller experienced operational error during vectors for parallel approach procedures when aircraft did not descend as expected.
| Attributes | |
| ACN | 626522 |
| Time | |
| Date | 200408 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 3300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 18r |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B717 (Formerly MD-95) |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 17l |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 19 controller time certified in position1 : 12 |
| ASRS Report | 626522 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance FAA |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was being vectored to ILS runway 18R. Aircraft #2 was being vectored for ILS runway 17C. Aircraft #1 was expediting to 3000 ft, aircraft #2 was at 4000 ft. Aircraft #1 did not get to 3000 ft before losing separation with aircraft #2. Both aircraft were being vectored to ILS approachs due to new procedures at D10 approach control. Controllers are unable to issue a visual approach clearance to aircraft landing runways 17C and 18R at dfw. While working this session, aircraft had been reporting the airport in sight 15+ mi out. If aircraft #1 had been issued a visual approach that far out, this error would not have occurred. (This procedure is difficult to explain on paper.) event occurred at XA46 local, at which time I advised the supervisor. I was relieved from the position.
Original NASA ASRS Text
Title: D10 CTLR EXPERIENCED OPERROR DURING VECTORS FOR PARALLEL APCH PROCS WHEN ACFT DID NOT DSND AS EXPECTED.
Narrative: ACFT #1 WAS BEING VECTORED TO ILS RWY 18R. ACFT #2 WAS BEING VECTORED FOR ILS RWY 17C. ACFT #1 WAS EXPEDITING TO 3000 FT, ACFT #2 WAS AT 4000 FT. ACFT #1 DID NOT GET TO 3000 FT BEFORE LOSING SEPARATION WITH ACFT #2. BOTH ACFT WERE BEING VECTORED TO ILS APCHS DUE TO NEW PROCS AT D10 APCH CTL. CTLRS ARE UNABLE TO ISSUE A VISUAL APCH CLRNC TO ACFT LNDG RWYS 17C AND 18R AT DFW. WHILE WORKING THIS SESSION, ACFT HAD BEEN RPTING THE ARPT IN SIGHT 15+ MI OUT. IF ACFT #1 HAD BEEN ISSUED A VISUAL APCH THAT FAR OUT, THIS ERROR WOULD NOT HAVE OCCURRED. (THIS PROC IS DIFFICULT TO EXPLAIN ON PAPER.) EVENT OCCURRED AT XA46 LCL, AT WHICH TIME I ADVISED THE SUPVR. I WAS RELIEVED FROM THE POS.
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.