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Tower controller released a B737 closely behind a commuter CL60 aircraft resulting in the B737 overtaking the first aircraft. The departure controller issued a radar vector to the B737.
| Attributes | |
| ACN | 402939 |
| Time | |
| Date | 199804 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pxr airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx tower : phx |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL600 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar pilot : instrument |
| Experience | controller non radar : 13 controller radar : 3 flight time total : 2200 |
| ASRS Report | 402939 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 5000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
B737 departed immediately behind a challenger at same runway and same routing for first 15 mi, presumably on visual separation. Departure controller immediately issued slowest possible assignable speed (230 KTS) to the B737 due to arrs inbound at 9000 ft. Both aircraft leveled at 8000 ft. The B737 continued to overtake the challenger too close -- less than 1 mi. I had to vector both aircraft off side to prevent further deterioration. Tower controllers need to take aircraft performance into account, and not worry so much about reporting delays.
Original NASA ASRS Text
Title: TWR CTLR RELEASED A B737 CLOSELY BEHIND A COMMUTER CL60 ACFT RESULTING IN THE B737 OVERTAKING THE FIRST ACFT. THE DEP CTLR ISSUED A RADAR VECTOR TO THE B737.
Narrative: B737 DEPARTED IMMEDIATELY BEHIND A CHALLENGER AT SAME RWY AND SAME ROUTING FOR FIRST 15 MI, PRESUMABLY ON VISUAL SEPARATION. DEP CTLR IMMEDIATELY ISSUED SLOWEST POSSIBLE ASSIGNABLE SPD (230 KTS) TO THE B737 DUE TO ARRS INBOUND AT 9000 FT. BOTH ACFT LEVELED AT 8000 FT. THE B737 CONTINUED TO OVERTAKE THE CHALLENGER TOO CLOSE -- LESS THAN 1 MI. I HAD TO VECTOR BOTH ACFT OFF SIDE TO PREVENT FURTHER DETERIORATION. TWR CTLRS NEED TO TAKE ACFT PERFORMANCE INTO ACCOUNT, AND NOT WORRY SO MUCH ABOUT RPTING DELAYS.
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.