Close proximity commuter-light transport GA-small aircraft 5 miles west of hpn.

Attributes
ACN	158993
Time
Date	199008
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	msl bound lower : 1700 msl bound upper : 1700
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	tower : hpn
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 3100 flight time type : 1000
ASRS Report	158993
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Inter Facility Coordination Failure

Narrative:

During ILS approach to hpn, approach controller handed us off to tower. Switched to tower frequency. Tower controller was busy with other traffic. Tower controller called us to see if we were on frequency and immediately issued traffic alert '1/4 mi, 12 O'clock.' we were immediately before overcast descending on G/south and on localizer approximately 1700'[ MSL. Aircraft was single engine small aircraft westbound past approximately 100' beneath our aircraft. No evasive due to close range. We had just descended below last layer of cloud.

Original NASA ASRS Text

Title: CLOSE PROX COMMUTER-LTT GA-SMA 5 MILES WEST OF HPN.

Narrative: DURING ILS APCH TO HPN, APCH CTLR HANDED US OFF TO TWR. SWITCHED TO TWR FREQ. TWR CTLR WAS BUSY WITH OTHER TFC. TWR CTLR CALLED US TO SEE IF WE WERE ON FREQ AND IMMEDIATELY ISSUED TFC ALERT '1/4 MI, 12 O'CLOCK.' WE WERE IMMEDIATELY BEFORE OVCST DSNDING ON G/S AND ON LOC APPROX 1700'[ MSL. ACFT WAS SINGLE ENG SMA WBND PAST APPROX 100' BENEATH OUR ACFT. NO EVASIVE DUE TO CLOSE RANGE. WE HAD JUST DSNDED BELOW LAST LAYER OF CLOUD.

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.