A B757 had a near miss with a learjet during descent into bwi.

Attributes
ACN	436723
Time
Date	199905
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mrb.vortac
State Reference	WV
Altitude	msl bound lower : 11000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Route In Use	arrival star : mgw.em13
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : iad.tracon
Operator	general aviation : corporate
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 18000 flight time type : 3500
ASRS Report	436723
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 1250 vertical : 700
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Descending to 11000 ft on mgw.EMI3 STAR, handed off from ZDC to dulles approach. After we checked on, got a TA. Approach then advised a VFR lear 12:30 - 1 O'clock position. We then got an RA 'climb.' acquired the traffic visually, stopped descent, began climb. Lear appeared to continue its climb towards us and in a shallow left turn. Lear passed close by off our right, probably less than 1000 ft vertically.

Original NASA ASRS Text

Title: A B757 HAD A NEAR MISS WITH A LEARJET DURING DSCNT INTO BWI.

Narrative: DSNDING TO 11000 FT ON MGW.EMI3 STAR, HANDED OFF FROM ZDC TO DULLES APCH. AFTER WE CHKED ON, GOT A TA. APCH THEN ADVISED A VFR LEAR 12:30 - 1 O'CLOCK POS. WE THEN GOT AN RA 'CLB.' ACQUIRED THE TFC VISUALLY, STOPPED DSCNT, BEGAN CLB. LEAR APPEARED TO CONTINUE ITS CLB TOWARDS US AND IN A SHALLOW L TURN. LEAR PASSED CLOSE BY OFF OUR R, PROBABLY LESS THAN 1000 FT VERTLY.

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.