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Den tower controller; D01 TRACON controller; and a flight crew reported a near midair collision between aircraft departing on parallel runways.
| Attributes | |
| ACN | 1497357 |
| Time | |
| Date | 201711 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | D01.TRACON |
| State Reference | CO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Small Transport |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors SID SPAZZ THREE |
| Flight Plan | IFR |
| Person 1 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 4 |
| Person 2 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
Tower requested approval to put aircraft X on a 150 heading. I approved it. Shortly after aircraft X took off 17R and right next to him appeared aircraft Y departing the parallel left runway. I assumed the tower would call to amend their plan; but aircraft X turned left. They were very close very fast; and I thought there could be no way that local control didn't see it and I didn't want to distract local control at such a critical time.but the planes just stayed right next to each other. I tried to call to get them to turn away; and there was someone else talking on the frequency. I got off the line. I tried to call again and I saw aircraft X turning left. I got off the line again. I didn't think of it at the time; but I could have called the other local control or tried to call the cab coordinator; or had the supervisor do it.
Original NASA ASRS Text
Title: DEN Tower Controller; D01 TRACON Controller; and a flight crew reported a NMAC between aircraft departing on parallel runways.
Narrative: Tower requested approval to put Aircraft X on a 150 heading. I approved it. Shortly after Aircraft X took off 17R and right next to him appeared Aircraft Y departing the parallel left runway. I assumed the tower would call to amend their plan; but Aircraft X turned left. They were very close very fast; and I thought there could be no way that Local Control didn't see it and I didn't want to distract Local Control at such a critical time.But the planes just stayed right next to each other. I tried to call to get them to turn away; and there was someone else talking on the frequency. I got off the line. I tried to call again and I saw Aircraft X turning left. I got off the line again. I didn't think of it at the time; but I could have called the other Local Control or tried to call the Cab Coordinator; or had the Supervisor do it.
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.