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Approach controller working the final monitor position for runway 30R had a 10-15 second blink on his ASR-9 radar and gave an air carrier SF34 a missed approach. Reporter feels ASR-9 not suitable for final monitoring without a final monitor aid or dual beacon antennas.
| Attributes | |
| ACN | 321017 |
| Time | |
| Date | 199511 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 4300 msl bound upper : 4300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 321017 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 4300 vertical : 100 |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
Narrative:
We were conducting simultaneous approachs (ILS/lda runway 30). I was the final monitor for runway 30R. The primary radar failed for about 10-15 seconds, but secondary remained. Because primary radar is required to monitor simultaneous approachs on the ASR-9, I began to issue 'pull-out' instructions to my aircraft. I was only able to pull-out one before primary radar returned. Solution: the ASR-9 at stl is unsuitable to conduct simultaneous approachs because of these occurrences. In addition, we are required to slightly stagger the different runways. (We must maintain 1/2 to 1/16 of a mi!) need a final monitor aid (FMA) with either the 'east scan' radar or dual beacon antennas on the ASR-9. There are 4 or 5 of these in storage.
Original NASA ASRS Text
Title: APCH CTLR WORKING THE FINAL MONITOR POS FOR RWY 30R HAD A 10-15 SECOND BLINK ON HIS ASR-9 RADAR AND GAVE AN ACR SF34 A MISSED APCH. RPTR FEELS ASR-9 NOT SUITABLE FOR FINAL MONITORING WITHOUT A FINAL MONITOR AID OR DUAL BEACON ANTENNAS.
Narrative: WE WERE CONDUCTING SIMULTANEOUS APCHS (ILS/LDA RWY 30). I WAS THE FINAL MONITOR FOR RWY 30R. THE PRIMARY RADAR FAILED FOR ABOUT 10-15 SECONDS, BUT SECONDARY REMAINED. BECAUSE PRIMARY RADAR IS REQUIRED TO MONITOR SIMULTANEOUS APCHS ON THE ASR-9, I BEGAN TO ISSUE 'PULL-OUT' INSTRUCTIONS TO MY ACFT. I WAS ONLY ABLE TO PULL-OUT ONE BEFORE PRIMARY RADAR RETURNED. SOLUTION: THE ASR-9 AT STL IS UNSUITABLE TO CONDUCT SIMULTANEOUS APCHS BECAUSE OF THESE OCCURRENCES. IN ADDITION, WE ARE REQUIRED TO SLIGHTLY STAGGER THE DIFFERENT RWYS. (WE MUST MAINTAIN 1/2 TO 1/16 OF A MI!) NEED A FINAL MONITOR AID (FMA) WITH EITHER THE 'E SCAN' RADAR OR DUAL BEACON ANTENNAS ON THE ASR-9. THERE ARE 4 OR 5 OF THESE IN STORAGE.
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.