Potential conflict with a control zone.

Attributes
ACN	138599
Time
Date	199003
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Military Transport
Flight Phase	cruise other cruise other descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 3000 flight time type : 250
ASRS Report	138599
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 1000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On downwind to runway 34 at hpn, approach control called several VFR targets which we idented. We were cleared to intercept the localizer at 2500' MSL, over the shoreline. During our base leg turn to final, approach control called additional traffic at 3 O'clock, 2400' unconfirmed. When we sighted this aircraft it was headed directly toward us, slightly below our altitude. It was a high wing single engine aircraft. I stopped our descent and increased our turn rate. The other aircraft appeared to alter its course to the left and passed behind and slightly below us. I commented to the ATC controller about the proximity of this aircraft. The controller confirmed that he was not in radio contact with this small aircraft. Once on the ground, I phoned the hpn facility and repeated my concern to this controller. He commented that they had attempted, without success. To track the intruding aircraft on radar, but it had descended below minimum radar altitude. The controller stated his intention to file a violation against this small aircraft if it could be idented.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT WITH A CTL ZONE.

Narrative: ON DOWNWIND TO RWY 34 AT HPN, APCH CTL CALLED SEVERAL VFR TARGETS WHICH WE IDENTED. WE WERE CLRED TO INTERCEPT THE LOC AT 2500' MSL, OVER THE SHORELINE. DURING OUR BASE LEG TURN TO FINAL, APCH CTL CALLED ADDITIONAL TFC AT 3 O'CLOCK, 2400' UNCONFIRMED. WHEN WE SIGHTED THIS ACFT IT WAS HEADED DIRECTLY TOWARD US, SLIGHTLY BELOW OUR ALT. IT WAS A HIGH WING SINGLE ENGINE ACFT. I STOPPED OUR DSCNT AND INCREASED OUR TURN RATE. THE OTHER ACFT APPEARED TO ALTER ITS COURSE TO THE LEFT AND PASSED BEHIND AND SLIGHTLY BELOW US. I COMMENTED TO THE ATC CTLR ABOUT THE PROX OF THIS ACFT. THE CTLR CONFIRMED THAT HE WAS NOT IN RADIO CONTACT WITH THIS SMA. ONCE ON THE GND, I PHONED THE HPN FAC AND REPEATED MY CONCERN TO THIS CTLR. HE COMMENTED THAT THEY HAD ATTEMPTED, WITHOUT SUCCESS. TO TRACK THE INTRUDING ACFT ON RADAR, BUT IT HAD DSNDED BELOW MINIMUM RADAR ALT. THE CTLR STATED HIS INTENTION TO FILE A VIOLATION AGAINST THIS SMA IF IT COULD BE IDENTED.

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