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Air carrier Y same heading assigned had less than standard separation from small aircraft X. System error.
| Attributes | |
| ACN | 235053 |
| Time | |
| Date | 199303 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sna |
| State Reference | CA |
| Altitude | msl bound lower : 500 msl bound upper : 500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna tower : sna |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller non radar : 18 controller radar : 2 |
| ASRS Report | 235053 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I instructed small aircraft X to taxi into position on runway 19R and hold. I then cleared small aircraft X for takeoff. I instructed air carrier Y to taxi into position and hold on runway 19R because I misinterpreted the flight progress strip for small aircraft X. I instructed small aircraft X to turn right, heading 220 degrees. I then cleared air carrier Y for takeoff. I instructed small aircraft X to contact coast. I then cleared air carrier Y for takeoff. Coast put small aircraft X on heading 175 degrees. Air carrier Y was heading 190 degrees and asked if small aircraft X was turning left. Loss of separation.
Original NASA ASRS Text
Title: ACR Y SAME HDG ASSIGNED HAD LTSS FROM SMA X. SYS ERROR.
Narrative: I INSTRUCTED SMA X TO TAXI INTO POS ON RWY 19R AND HOLD. I THEN CLRED SMA X FOR TKOF. I INSTRUCTED ACR Y TO TAXI INTO POS AND HOLD ON RWY 19R BECAUSE I MISINTERPRETED THE FLT PROGRESS STRIP FOR SMA X. I INSTRUCTED SMA X TO TURN R, HDG 220 DEGS. I THEN CLRED ACR Y FOR TKOF. I INSTRUCTED SMA X TO CONTACT COAST. I THEN CLRED ACR Y FOR TKOF. COAST PUT SMA X ON HDG 175 DEGS. ACR Y WAS HDG 190 DEGS AND ASKED IF SMA X WAS TURNING L. LOSS OF SEPARATION.
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.