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Potential conflict between military-medium large transport and air carrier-light transport operating VFR.
| Attributes | |
| ACN | 88715 |
| Time | |
| Date | 198806 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : swf |
| State Reference | NY |
| Altitude | msl bound lower : 5300 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw artcc : zbw |
| Operator | other |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : military |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : military |
| Experience | flight time last 90 days : 175 flight time total : 2200 flight time type : 1700 |
| ASRS Report | 88715 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : military |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 2500 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were approaching stewart and were assigned 6000' by bos center. They issued a VFR traffic advisory at our 10 O'clock, 2 mi, at 5700'. We saw the traffic and it was a direct conflict. We descended out of 6000' to approximately 5300' and turned right to avoid the traffic, and when clear climbed back to 6000'. We explained the situation to the center controller. The traffic appeared coalt and converging, that's why we took evasive action and then informed the controller. Callback conversation with reporter revealed the following: medium large transport had just changed frequency, so did not know if center was talking to light transport or not, but center did know light transport was VFR flight plan and supposedly at 5500' MSL, although readout apparently 5700' MSL, so light transport may have decided to climb. Perspective to medium large transport was light transport was head on so took evasive action and advised center of action.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT BETWEEN MIL-MLG AND ACR-LTT OPERATING VFR.
Narrative: WE WERE APCHING STEWART AND WERE ASSIGNED 6000' BY BOS CENTER. THEY ISSUED A VFR TFC ADVISORY AT OUR 10 O'CLOCK, 2 MI, AT 5700'. WE SAW THE TFC AND IT WAS A DIRECT CONFLICT. WE DSNDED OUT OF 6000' TO APPROX 5300' AND TURNED RIGHT TO AVOID THE TFC, AND WHEN CLR CLBED BACK TO 6000'. WE EXPLAINED THE SITUATION TO THE CENTER CTLR. THE TFC APPEARED COALT AND CONVERGING, THAT'S WHY WE TOOK EVASIVE ACTION AND THEN INFORMED THE CTLR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: MLG HAD JUST CHANGED FREQ, SO DID NOT KNOW IF CENTER WAS TALKING TO LTT OR NOT, BUT CENTER DID KNOW LTT WAS VFR FLT PLAN AND SUPPOSEDLY AT 5500' MSL, ALTHOUGH READOUT APPARENTLY 5700' MSL, SO LTT MAY HAVE DECIDED TO CLB. PERSPECTIVE TO MLG WAS LTT WAS HEAD ON SO TOOK EVASIVE ACTION AND ADVISED CENTER OF ACTION.
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.