A turboprop pilot and two K90 controllers reported a near miss near ack in ZBW airspace between one ...

Attributes
ACN	1042381
Time
Date	201210
Local Time Of Day	1801-2400
Place
Locale Reference	K90.TRACON
State Reference	MA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	None
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 175 Flight Crew Total 3800 Flight Crew Type 850
Person 2
Function	Supervisor / CIC
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 22
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 300 Vertical 300

Narrative:

We were descending into ack in VMC while VFR. Passing about 5;500 we visually acquired traffic at our 11 o'clock. The traffic page of our mfd indicated he was at a range of 10 miles. Shortly after we acquired the traffic cape approach warned us of the same traffic and said they were westbound at 4;500 ft. Upon passing through 4;500 ft during our descent the conflicting traffic was approximately 4 miles from us at our 11 o'clock position and began to descend. At approximately 2 miles he began a left turn toward us. His aircraft no longer had any relative movement and was coming directly at us. The lights of his aircraft were getting more vivid by the second. The pilot flying and I both pulled back on the yoke to initiate and very steep climb to avoid the other aircraft. During our climb the TCAS alerted us to the traffic. I watched the other aircraft pass below our aircraft from left to right. This situation is another example of why looking outside the aircraft for conflicting traffic is so important.

Original NASA ASRS Text

Title: A turboprop pilot and two K90 controllers reported a near miss near ACK in ZBW airspace between one VFR aircraft with flight following and another VFR aircraft with no communications.

Narrative: We were descending into ACK in VMC while VFR. Passing about 5;500 we visually acquired traffic at our 11 o'clock. The traffic page of our MFD indicated he was at a range of 10 miles. Shortly after we acquired the traffic Cape Approach warned us of the same traffic and said they were westbound at 4;500 FT. Upon passing through 4;500 FT during our descent the conflicting traffic was approximately 4 miles from us at our 11 o'clock position and began to descend. At approximately 2 miles he began a left turn toward us. His aircraft no longer had any relative movement and was coming directly at us. The lights of his aircraft were getting more vivid by the second. The pilot flying and I both pulled back on the yoke to initiate and very steep climb to avoid the other aircraft. During our climb the TCAS alerted us to the traffic. I watched the other aircraft pass below our aircraft from left to right. This situation is another example of why looking outside the aircraft for conflicting traffic is so important.

Data retrieved from NASA's ASRS site as of July 2013 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.

A turboprop pilot and two K90 controllers reported a near miss near ack in ZBW airspace between one VFR aircraft with flight following and another VFR aircraft with no communications.