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PIC report on the confusion instigated by an ATIS broadcast at stl. Flight crew failed to understand the term 'dependent converging ILS approachs runway 12R and back course runway 6 in use.' approach controller attempted an explanation.
| Attributes | |
| ACN | 363676 |
| Time | |
| Date | 199703 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : stl |
| State Reference | MO |
| Altitude | msl bound lower : 10000 msl bound upper : 18000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 363676 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
| Navigational Aid | Unspecified |
Narrative:
Location: 80 NM northeast of stl. Both ACARS uplink ATIS and VHF broadcast ATIS announced 'dependent converging ILS approachs runway 12R, and back course runway 6 in use.' phraseology led us to search for a published converging ILS, but none was found. At TRACON handoff, I challenged the approach in use, and the controller offered an explanation involving their necessary vertical/lateral separation procedures when runway 12R and runway 6 are in simultaneous use. The on-air conversation triggered comments from other air carrier flts also on frequency. I suspect the phraseology was misplaced and related to controller handbook procedures which are normally transparent to flcs. The 'dependent converging' phraseology generated some confusion.
Original NASA ASRS Text
Title: PIC RPT ON THE CONFUSION INSTIGATED BY AN ATIS BROADCAST AT STL. FLC FAILED TO UNDERSTAND THE TERM 'DEPENDENT CONVERGING ILS APCHS RWY 12R AND BACK COURSE RWY 6 IN USE.' APCH CTLR ATTEMPTED AN EXPLANATION.
Narrative: LOCATION: 80 NM NE OF STL. BOTH ACARS UPLINK ATIS AND VHF BROADCAST ATIS ANNOUNCED 'DEPENDENT CONVERGING ILS APCHS RWY 12R, AND BACK COURSE RWY 6 IN USE.' PHRASEOLOGY LED US TO SEARCH FOR A PUBLISHED CONVERGING ILS, BUT NONE WAS FOUND. AT TRACON HDOF, I CHALLENGED THE APCH IN USE, AND THE CTLR OFFERED AN EXPLANATION INVOLVING THEIR NECESSARY VERTICAL/LATERAL SEPARATION PROCS WHEN RWY 12R AND RWY 6 ARE IN SIMULTANEOUS USE. THE ON-AIR CONVERSATION TRIGGERED COMMENTS FROM OTHER ACR FLTS ALSO ON FREQ. I SUSPECT THE PHRASEOLOGY WAS MISPLACED AND RELATED TO CTLR HANDBOOK PROCS WHICH ARE NORMALLY TRANSPARENT TO FLCS. THE 'DEPENDENT CONVERGING' PHRASEOLOGY GENERATED SOME CONFUSION.
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.