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After departure reporter aircraft initiated a turn on course when departure controller expected that he would maintain runway heading resulting in conflict with other departing traffic.
| Attributes | |
| ACN | 114839 |
| Time | |
| Date | 198906 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ack |
| State Reference | MA |
| Altitude | msl bound lower : 900 msl bound upper : 900 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : fmh |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 20 flight time total : 1450 flight time type : 600 |
| ASRS Report | 114839 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 600 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation Inter Facility Coordination Failure |
Narrative:
Received, copied and read back a clearance with instructions to fly an airway. Turned on course after takeoff. Center queried if I'd been given a 'maintain runway heading'. I had not. While departure was talking about this and calling the tower to confirm it (tower said I had), a turboprop twin, leveling out, crossed underneath us. I turned to pass behind him. Departure directed turn back on runway heading would have made the conflict worse. I believe that departure should have been more concerned with the conflicts than with who gave who what clearance. A turn away from traffic might have resulted in a collision. As it was, traffic was out of sight underneath for some seconds. Moral: standard error: tower or someone omits a part of a clearance and the error isn't caught on readback.
Original NASA ASRS Text
Title: AFTER DEP REPORTER ACFT INITIATED A TURN ON COURSE WHEN DEP CTLR EXPECTED THAT HE WOULD MAINTAIN RWY HEADING RESULTING IN CONFLICT WITH OTHER DEPARTING TRAFFIC.
Narrative: RECEIVED, COPIED AND READ BACK A CLRNC WITH INSTRUCTIONS TO FLY AN AIRWAY. TURNED ON COURSE AFTER TKOF. CENTER QUERIED IF I'D BEEN GIVEN A 'MAINTAIN RWY HDG'. I HAD NOT. WHILE DEP WAS TALKING ABOUT THIS AND CALLING THE TWR TO CONFIRM IT (TWR SAID I HAD), A TURBOPROP TWIN, LEVELING OUT, CROSSED UNDERNEATH US. I TURNED TO PASS BEHIND HIM. DEP DIRECTED TURN BACK ON RWY HDG WOULD HAVE MADE THE CONFLICT WORSE. I BELIEVE THAT DEP SHOULD HAVE BEEN MORE CONCERNED WITH THE CONFLICTS THAN WITH WHO GAVE WHO WHAT CLRNC. A TURN AWAY FROM TFC MIGHT HAVE RESULTED IN A COLLISION. AS IT WAS, TFC WAS OUT OF SIGHT UNDERNEATH FOR SOME SECONDS. MORAL: STANDARD ERROR: TWR OR SOMEONE OMITS A PART OF A CLRNC AND THE ERROR ISN'T CAUGHT ON READBACK.
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.