B737 crew had lear jet descend on top of them.

Attributes
ACN	425615
Time
Date	199901
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : brv airport : iad
State Reference	VA
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Flight Phase	cruise other descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 13000 flight time type : 6000
ASRS Report	425615
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 15840 vertical : 300
Supplementary
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

Approaching brooke VOR on arrival to iad at 10000 ft, 250 KTS. ZDC pointed out learjet at 12 O'clock position, 10800 ft descending about 6 mi. TCASII gave TA when lear was 1 O'clock position about 4 mi and 600 ft above us, then RA when traffic was about 3 mi, 1 O'clock position and 300 ft above. We followed RA of 1500 FPM descent, until clear of conflict, advised ATC and he continued our descent to 5000 ft. Center had issued traffic to us, but as we got the TCASII RA we had just switched over to approach control and he wasn't aware of what was going on with the lear, but said that he would check with ZDC.

Original NASA ASRS Text

Title: B737 CREW HAD LEAR JET DSND ON TOP OF THEM.

Narrative: APCHING BROOKE VOR ON ARR TO IAD AT 10000 FT, 250 KTS. ZDC POINTED OUT LEARJET AT 12 O'CLOCK POS, 10800 FT DSNDING ABOUT 6 MI. TCASII GAVE TA WHEN LEAR WAS 1 O'CLOCK POS ABOUT 4 MI AND 600 FT ABOVE US, THEN RA WHEN TFC WAS ABOUT 3 MI, 1 O'CLOCK POS AND 300 FT ABOVE. WE FOLLOWED RA OF 1500 FPM DSCNT, UNTIL CLR OF CONFLICT, ADVISED ATC AND HE CONTINUED OUR DSCNT TO 5000 FT. CTR HAD ISSUED TFC TO US, BUT AS WE GOT THE TCASII RA WE HAD JUST SWITCHED OVER TO APCH CTL AND HE WASN'T AWARE OF WHAT WAS GOING ON WITH THE LEAR, BUT SAID THAT HE WOULD CHK WITH ZDC.

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.