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An ATCT local controller admits that his desire to avoid a cpr aircraft further delay led to a less than standard separation with an approaching air carrier B737. The CL60 had a longer takeoff run than he anticipated and the B737 had a tailwind on final approach.
| Attributes | |
| ACN | 390443 |
| Time | |
| Date | 199801 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : las |
| Operator | general aviation : corporate |
| Make Model Name | Challenger CL603/603a |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : takeoff |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller non radar : 11 controller radar : 13 |
| ASRS Report | 390443 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : ground critical non adherence : published procedure non adherence : far non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated Other |
| Miss Distance | horizontal : 3500 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Level 3 limited radar tower. Approach airspace shared with level 4 and 5 towers. Airspace confign (R30/southeast) was leading to numerous delays or reroutes for acrs and other aircraft. The subject aircraft had received both of these and had finally obtained a release from approach. In an attempt to get him on his way, I cleared him for takeoff with an arriving B737 on a 4 mi final. When it became apparent that loss of separation would occur and the arriving pilot questioned the operation, I instructed him to continue and land. I allowed my desire to mitigate the delay and avoid the awkwardness of a go around (extraneous factors) to color my judgement when I should have noted the tailwind affecting the arrival and the heavily loaded performance of the xcontinent challenger jet.
Original NASA ASRS Text
Title: AN ATCT LCL CTLR ADMITS THAT HIS DESIRE TO AVOID A CPR ACFT FURTHER DELAY LED TO A LTSS WITH AN APCHING ACR B737. THE CL60 HAD A LONGER TKOF RUN THAN HE ANTICIPATED AND THE B737 HAD A TAILWIND ON FINAL APCH.
Narrative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
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.