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ATCT local controller initiates go around for aircraft on final approach that he perceives are at insufficient spacing for type weight category.
| Attributes | |
| ACN | 411619 |
| Time | |
| Date | 199808 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : sfo |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 411619 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure other |
Narrative:
Aircraft #2 was on 3 mi final ILS runway 28R (5 DME localizer). Aircraft #1 was 5 mi in trail cleared ILS runway 28R approach. Aircraft #2 speed indicated 30 KTS faster than aircraft #1. On initial contact, I asked aircraft #1 if they had aircraft #2 in sight. Reply was negative, they were IMC. By now separation had decreased to just over 4 mi, aircraft #1 was still faster. I issued aircraft #1 a missed approach. I subsequently had 2 more aircraft on final shipped to me by approach, faster than aircraft ahead, with insufficient spacing to allow a legal approach. After a short break I was working radar coordinator position and approach gave tower 3 arrs within 15 mins, too close and too fast to allow legal approach. There were also several approachs which were just legal.
Original NASA ASRS Text
Title: ATCT LCL CTLR INITIATES GAR FOR ACFT ON FINAL APCH THAT HE PERCEIVES ARE AT INSUFFICIENT SPACING FOR TYPE WT CATEGORY.
Narrative: ACFT #2 WAS ON 3 MI FINAL ILS RWY 28R (5 DME LOC). ACFT #1 WAS 5 MI IN TRAIL CLRED ILS RWY 28R APCH. ACFT #2 SPD INDICATED 30 KTS FASTER THAN ACFT #1. ON INITIAL CONTACT, I ASKED ACFT #1 IF THEY HAD ACFT #2 IN SIGHT. REPLY WAS NEGATIVE, THEY WERE IMC. BY NOW SEPARATION HAD DECREASED TO JUST OVER 4 MI, ACFT #1 WAS STILL FASTER. I ISSUED ACFT #1 A MISSED APCH. I SUBSEQUENTLY HAD 2 MORE ACFT ON FINAL SHIPPED TO ME BY APCH, FASTER THAN ACFT AHEAD, WITH INSUFFICIENT SPACING TO ALLOW A LEGAL APCH. AFTER A SHORT BREAK I WAS WORKING RADAR COORDINATOR POS AND APCH GAVE TWR 3 ARRS WITHIN 15 MINS, TOO CLOSE AND TOO FAST TO ALLOW LEGAL APCH. THERE WERE ALSO SEVERAL APCHS WHICH WERE JUST LEGAL.
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.