Near midair collision in TCA between air carrier-large transport on approach and unk-small aircraft.

Attributes
ACN	83952
Time
Date	198803
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 1800
ASRS Report	83952
Person 2
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 200 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

As we broke out the bottom of an overcast, flight visibility 1-2 mi, an small aircraft type aircraft, cream in color with red trim, appeared at our 2 O'clock position on a converging course. The AC ft made a left evasive turn passing within 50' vertical and 200' horizontal opp to our heading. Approach control and tower radar did not see the aircraft.

Original NASA ASRS Text

Title: NMAC IN TCA BETWEEN ACR-LGT ON APCH AND UNK-SMA.

Narrative: AS WE BROKE OUT THE BOTTOM OF AN OVCST, FLT VIS 1-2 MI, AN SMA TYPE ACFT, CREAM IN COLOR WITH RED TRIM, APPEARED AT OUR 2 O'CLOCK POS ON A CONVERGING COURSE. THE AC FT MADE A LEFT EVASIVE TURN PASSING WITHIN 50' VERT AND 200' HORIZ OPP TO OUR HDG. APCH CTL AND TWR RADAR DID NOT SEE THE ACFT.

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.