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A tower controller reported that his trainee did not use correct phraseology to apply visual separation with successive departures. The second departure lost sight of the first departure and the pilot declared a near midair collision.
| Attributes | |
| ACN | 1376445 |
| Time | |
| Date | 201607 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | TOA.Tower |
| State Reference | CA |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Climb |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | PA-28 Cherokee/Archer/Dakota/Pillan/Warrior |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local Instructor |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 3.0 |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Training in progress on local 1. Aircraft X (cessna 172) departed straight out VFR. Aircraft Y (PA28) departed second IFR. Aircraft Y was issued traffic and told aircraft X was departing straight out. There was a layer of stratus clouds over the shore and aircraft Y went in a cloud and lost sight of aircraft X. We didn't use correct phraseology for issuing visual separation. We could have turned the VFR aircraft 15 degrees to the right to guarantee separation from IFR traffic. As a trainer; I should have been more aware of my trainee's plan and helped them execute it more smoothly.
Original NASA ASRS Text
Title: A Tower Controller reported that his trainee did not use correct phraseology to apply visual separation with successive departures. The second departure lost sight of the first departure and the pilot declared a NMAC.
Narrative: Training in progress on Local 1. Aircraft X (Cessna 172) departed straight out VFR. Aircraft Y (PA28) departed second IFR. Aircraft Y was issued traffic and told Aircraft X was departing straight out. There was a layer of stratus clouds over the shore and Aircraft Y went in a cloud and lost sight of Aircraft X. We didn't use correct phraseology for issuing Visual Separation. We could have turned the VFR aircraft 15 degrees to the right to guarantee separation from IFR traffic. As a trainer; I should have been more aware of my trainee's plan and helped them execute it more smoothly.
Data retrieved from NASA's ASRS site 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.