2 jets have an near midair collision while on approach to dca.

Attributes
ACN	163102
Time
Date	199011
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 1000 msl bound upper : 1300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dca tower : ewr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 450 flight time total : 4850 flight time type : 1600
ASRS Report	163102
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Jet passed from east to west over our position by 300'. Appeared to be vectored onto the 36 mount vernon visibility approach from the east side. Our flight had been vectored by a visibility approach cleared to the course from the west side. We maintained visibility sep as requested.

Original NASA ASRS Text

Title: 2 JETS HAVE AN NMAC WHILE ON APCH TO DCA.

Narrative: JET PASSED FROM E TO W OVER OUR POS BY 300'. APPEARED TO BE VECTORED ONTO THE 36 MOUNT VERNON VIS APCH FROM THE E SIDE. OUR FLT HAD BEEN VECTORED BY A VIS APCH CLRED TO THE COURSE FROM THE W SIDE. WE MAINTAINED VIS SEP AS REQUESTED.

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.