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Potential conflict when #1 aircraft turns early base leg when message traffic advisory is given to #2 aircraft.
| Attributes | |
| ACN | 114198 |
| Time | |
| Date | 198906 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cos |
| State Reference | CO |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cos |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other cruise other other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor oversight : pic |
| Qualification | pilot : commercial pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 300 flight time total : 1100 |
| ASRS Report | 114198 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 0 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Flight instructor and student were in touch and go pattern left traffic. Controller stated extend downwind. We were extending downwind. #2 aircraft entered pattern right traffic. Controller told small aircraft they were #2 following us and gave the small aircraft a position report that we were on left base. We took that to be our que to turn base. When we turned base, the controller's supervisor came on and told us that our last instructions were to extend downwind and that he would call base. We corrected and asked for a full stop and called the control tower.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT WHEN #1 ACFT TURNS EARLY BASE LEG WHEN MESSAGE TRAFFIC ADVISORY IS GIVEN TO #2 ACFT.
Narrative: FLT INSTRUCTOR AND STUDENT WERE IN TOUCH AND GO PATTERN LEFT TFC. CTLR STATED EXTEND DOWNWIND. WE WERE EXTENDING DOWNWIND. #2 ACFT ENTERED PATTERN RIGHT TFC. CTLR TOLD SMA THEY WERE #2 FOLLOWING US AND GAVE THE SMA A POSITION REPORT THAT WE WERE ON LEFT BASE. WE TOOK THAT TO BE OUR QUE TO TURN BASE. WHEN WE TURNED BASE, THE CTLR'S SUPVR CAME ON AND TOLD US THAT OUR LAST INSTRUCTIONS WERE TO EXTEND DOWNWIND AND THAT HE WOULD CALL BASE. WE CORRECTED AND ASKED FOR A FULL STOP AND CALLED THE CTL TWR.
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.