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Tower local controller had less than standard separation between small aircraft X and light transport Y when cleared for takeoff. System error. Near midair collision.
| Attributes | |
| ACN | 123828 |
| Time | |
| Date | 198910 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : apa |
| State Reference | CO |
| Altitude | agl bound lower : 200 agl bound upper : 200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : apa |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : takeoff climbout : intermediate altitude |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff climbout : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller military : 4 controller non radar : 13 |
| ASRS Report | 123828 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Small aircraft X called ready to go runway 28 southeast departure. Light transport X was in position on runway 35R holding in position. I asked small aircraft X if he could make a left turn southeast prior to the alana taxiway, which is the parallel taxiway east of runway 35R, that pilot replied affirmative. I cleared small aircraft X for takeoff with the restriction on the turn and advised him traffic would be an light transport jet departing runway 35R. I then cleared light transport Y for takeoff and advised him of the traffic departing runway 28. Small aircraft X did not comply with the restriction and turned just prior to runway 35R as light transport Y passed on the upwind. In the future I will disapprove any runway 28 departures if there will be any conflict with traffic on runway 35R. Callback conversation with reporter revealed the following: no system error was filed. No near midair collision reports were filed by the pilots. Reporter estimates the separation between aircraft was 200' horizontally, 0' vertically.
Original NASA ASRS Text
Title: TWR LCL CTLR HAD LESS THAN STANDARD SEPARATION BETWEEN SMA X AND LTT Y WHEN CLEARED FOR TKOF. SYSTEM ERROR. NMAC.
Narrative: SMA X CALLED READY TO GO RWY 28 SE DEP. LTT X WAS IN POSITION ON RWY 35R HOLDING IN POSITION. I ASKED SMA X IF HE COULD MAKE A LEFT TURN SE PRIOR TO THE ALANA TXWY, WHICH IS THE PARALLEL TXWY E OF RWY 35R, THAT PLT REPLIED AFFIRMATIVE. I CLRED SMA X FOR TKOF WITH THE RESTRICTION ON THE TURN AND ADVISED HIM TFC WOULD BE AN LTT JET DEPARTING RWY 35R. I THEN CLRED LTT Y FOR TKOF AND ADVISED HIM OF THE TFC DEPARTING RWY 28. SMA X DID NOT COMPLY WITH THE RESTRICTION AND TURNED JUST PRIOR TO RWY 35R AS LTT Y PASSED ON THE UPWIND. IN THE FUTURE I WILL DISAPPROVE ANY RWY 28 DEPS IF THERE WILL BE ANY CONFLICT WITH TFC ON RWY 35R. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: NO SYSTEM ERROR WAS FILED. NO NMAC REPORTS WERE FILED BY THE PLTS. REPORTER ESTIMATES THE SEPARATION BETWEEN ACFT WAS 200' HORIZONTALLY, 0' VERTICALLY.
Data retrieved from NASA's ASRS site as of August 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.