A corporate pilot reported the hpn local controller lost track of traffic in that airport's airspace...

Attributes
ACN	892098
Time
Date	201005
Local Time Of Day	1201-1800
Place
Locale Reference	HPN.Airport
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Flight Phase	Descent Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Plan	VFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Glider Flight Crew Instrument Flight Crew Multiengine
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 3500 Flight Crew Type 3000
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Horizontal 300 Vertical 0

Narrative:

Ny approach handoff to hpn tower about 7 NM from airport. TCAS alert signaling traffic at 11 o'clock 3 miles. Started to look for traffic while contacting hpn tower. Took a right turn northbound until we had visual with traffic. A second TCAS alert traffic at 2 o'clock roughly 1 NM southbound. Started to look for additional traffic. Copilot spotted second traffic less than half a mile moving southbound right at us. I gave controls to copilot as he had sight of traffic and could better avoid. He banked aircraft 45 degrees left and descended away from traffic. Near mid-air collision. The traffic was never advised by either ny TRACON on the hand off or hpn tower. Also; on a side note; hpn local control seemed to have lost positive control of the flow of traffic in the pattern many times. We had a total of two runway changes; three 360 degree turns or course reversals either back to final or in pattern area and multiple requests from hpn tower for s-turns last minute before actually landing. We felt a loss of safety while in hpn's class D airspace and in the pattern. We also felt like we had to aggressively 'see and avoid' in their airspace in fear of getting hit by other aircraft.

Original NASA ASRS Text

Title: A corporate pilot reported the HPN Local Controller lost track of traffic in that airport's airspace. The Reporter had a near miss with unreported traffic at 2;500 FT near the airport.

Narrative: NY Approach handoff to HPN Tower about 7 NM from airport. TCAS alert signaling traffic at 11 o'clock 3 miles. Started to look for traffic while contacting HPN Tower. Took a right turn northbound until we had visual with traffic. A second TCAS alert traffic at 2 o'clock roughly 1 NM southbound. Started to look for additional traffic. Copilot spotted second traffic less than half a mile moving southbound right at us. I gave controls to copilot as he had sight of traffic and could better avoid. He banked aircraft 45 degrees left and descended away from traffic. Near mid-air collision. The traffic was never advised by either NY TRACON on the hand off or HPN Tower. Also; on a side note; HPN Local Control seemed to have lost positive control of the flow of traffic in the pattern many times. We had a total of two runway changes; three 360 degree turns or course reversals either back to final or in pattern area and multiple requests from HPN Tower for S-turns last minute before actually landing. We felt a loss of safety while in HPN's Class D airspace and in the pattern. We also felt like we had to aggressively 'see and avoid' in their airspace in fear of getting hit by other aircraft.

Data retrieved from NASA's ASRS site as of April 2012 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 corporate pilot reported the hpn local controller lost track of traffic in that airport's airspace. The reporter had a near miss with unreported traffic at 2;500 ft near the airport.