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Local controller sends 2 aircraft out on same heading climbing to same altitude without standard separation.
| Attributes | |
| ACN | 181890 |
| Time | |
| Date | 199106 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp tower : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 181890 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Small transport Y departed on a 090 heading. Small transport Y overtook an small transport X that had been departed on the same heading previously. Departure was very busy. In the 'well', I was later told the small transport X was instructed to expedite climb through 4000 for an airspace boundary. Inbounds were just starting to build. My departure headings are limited due to noise program. Normally at 4000 departure turns the aircraft. Behind the small transport Y I had an medium large transport holding on the runway to depart. I let the small transport X get 2-1/2 east of the airport before letting the small transport Y depart thinking it would be enough spacing. But the small transport Y caught up to the small transport X 6 east. The small transport X was starting a turn northbound. The MST Y passed 600 ft under and 1.5 mi from the small transport X.
Original NASA ASRS Text
Title: LCL CTLR SENDS 2 ACFT OUT ON SAME HDG CLBING TO SAME ALT WITHOUT STANDARD SEPARATION.
Narrative: SMT Y DEPARTED ON A 090 HDG. SMT Y OVERTOOK AN SMT X THAT HAD BEEN DEPARTED ON THE SAME HDG PREVIOUSLY. DEP WAS VERY BUSY. IN THE 'WELL', I WAS LATER TOLD THE SMT X WAS INSTRUCTED TO EXPEDITE CLB THROUGH 4000 FOR AN AIRSPACE BOUNDARY. INBOUNDS WERE JUST STARTING TO BUILD. MY DEP HDGS ARE LIMITED DUE TO NOISE PROGRAM. NORMALLY AT 4000 DEP TURNS THE ACFT. BEHIND THE SMT Y I HAD AN MLG HOLDING ON THE RWY TO DEPART. I LET THE SMT X GET 2-1/2 E OF THE ARPT BEFORE LETTING THE SMT Y DEPART THINKING IT WOULD BE ENOUGH SPACING. BUT THE SMT Y CAUGHT UP TO THE SMT X 6 E. THE SMT X WAS STARTING A TURN NBOUND. THE MST Y PASSED 600 FT UNDER AND 1.5 MI FROM THE SMT X.
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.