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B767 is instructed by svzm to descend and turn to avoid another foreign air carrier due to a confliction while on the ILS DME runway 9 approach to svmi.
| Attributes | |
| ACN | 520249 |
| Time | |
| Date | 200108 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : svzm.airport |
| State Reference | FO |
| Altitude | msl bound lower : 2000 msl bound upper : 4000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : svzm.tracon tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : svzm.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 520249 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : company policies non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended or assigned course flight crew : took precautionary avoidance action |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Problem Areas | Airport Airspace Structure Company ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : svzm.tracon |
| Chart | approach : ils dme rwy 09 |
Narrative:
After crossing mares intersection and at 4000 ft MSL on the 17 DME arc, a DC9 inbound from the west descended through our 4000 ft MSL altitude. We got a TCASII TA with 500 ft separation and ATC directed us to descend to 2000 ft MSL and discontinue the arc and intercept the ILS course at 2000 ft MSL. With 5800 ft as the MSA for this area and no published minimum radar vector altitude and 4000 ft MSL published until the 11.8 DME. It is not something that we had briefed nor were we comfortable with the ATC procedures as applicable to our published materials and procedures. Fortunately, this occurred in VMC conditions and we were able to fly it visually to intercept the ILS. The approach control radar minimum vector altitudes should be published so that they may be briefed and crews prepared to fly them and when an aircraft is cleared for an approach other aircraft should be separated from the approach conflict altitudes.
Original NASA ASRS Text
Title: B767 IS INSTRUCTED BY SVZM TO DSND AND TURN TO AVOID ANOTHER FOREIGN ACR DUE TO A CONFLICTION WHILE ON THE ILS DME RWY 9 APCH TO SVMI.
Narrative: AFTER XING MARES INTXN AND AT 4000 FT MSL ON THE 17 DME ARC, A DC9 INBOUND FROM THE W DSNDED THROUGH OUR 4000 FT MSL ALT. WE GOT A TCASII TA WITH 500 FT SEPARATION AND ATC DIRECTED US TO DSND TO 2000 FT MSL AND DISCONTINUE THE ARC AND INTERCEPT THE ILS COURSE AT 2000 FT MSL. WITH 5800 FT AS THE MSA FOR THIS AREA AND NO PUBLISHED MINIMUM RADAR VECTOR ALT AND 4000 FT MSL PUBLISHED UNTIL THE 11.8 DME. IT IS NOT SOMETHING THAT WE HAD BRIEFED NOR WERE WE COMFORTABLE WITH THE ATC PROCS AS APPLICABLE TO OUR PUBLISHED MATERIALS AND PROCS. FORTUNATELY, THIS OCCURRED IN VMC CONDITIONS AND WE WERE ABLE TO FLY IT VISUALLY TO INTERCEPT THE ILS. THE APCH CTL RADAR MINIMUM VECTOR ALTS SHOULD BE PUBLISHED SO THAT THEY MAY BE BRIEFED AND CREWS PREPARED TO FLY THEM AND WHEN AN ACFT IS CLRED FOR AN APCH OTHER ACFT SHOULD BE SEPARATED FROM THE APCH CONFLICT ALTS.
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.