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Tower controller described a questionable runway separation event when traffic cleared for an 'immediate take off' failed to respond as expected.
| Attributes | |
| ACN | 1001693 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna 425/441 Conquest I/Conquest II |
| Flight Phase | Takeoff |
| Route In Use | None |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
A B737 2 mile left base for runway 14 visual approach; a C441 departing runway 14. The C441 was ready for departure. I issued cleared for immediate take off and exchanged traffic; 'C441 cleared for immediate take off traffic on 2 mile left base. The C441 acknowledged. The B737 was given traffic departing prior to your arrival; the B737 acknowledged with; 'we'll square the base to final.' the C441 took his time rolling. At the time of lift off it appeared that less than 6;000 ft existed between the still airborne B737 and the C441. In the future I will not trust the C441 to comply with an immediate take off clearance; and/or; I would make a decision earlier whether to issue a go around or cancel take off clearance.
Original NASA ASRS Text
Title: Tower Controller described a questionable runway separation event when traffic cleared for an 'immediate take off' failed to respond as expected.
Narrative: A B737 2 mile left base for Runway 14 Visual Approach; a C441 departing Runway 14. The C441 was ready for departure. I issued cleared for immediate take off and exchanged traffic; 'C441 cleared for immediate take off traffic on 2 mile left base. The C441 acknowledged. The B737 was given traffic departing prior to your arrival; the B737 acknowledged with; 'We'll square the base to final.' The C441 took his time rolling. At the time of lift off it appeared that less than 6;000 FT existed between the still airborne B737 and the C441. In the future I will not trust the C441 to comply with an immediate take off clearance; and/or; I would make a decision earlier whether to issue a go around or cancel take off clearance.
Data retrieved from NASA's ASRS site as of July 2013 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.