Approach controller vectoring 2 air carrier aircraft for approach to dca. The controller turned and descended a FK10 and the second aircraft (a B737) received a TCASII RA on the FK10 and descended towards the FK10 causing less than standard separation to occur.

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Attributes
ACN	361347
Time
Date	199702
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 4000 msl bound upper : 5000
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dca tracon : las
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar pilot : student
Experience	controller radar : 11 flight time total : 10
ASRS Report	361347
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

An air carrier Y aircraft had been turned and descended out of 5000 ft for 3000 ft. Air carrier X (the B737) at 5000 ft wbound advised he was responding to an RA and descended into the air carrier Y also descending.

Original NASA ASRS Text

Title: APCH CTLR VECTORING 2 ACR ACFT FOR APCH TO DCA. THE CTLR TURNED AND DSNDED A FK10 AND THE SECOND ACFT (A B737) RECEIVED A TCASII RA ON THE FK10 AND DSNDED TOWARDS THE FK10 CAUSING LTSS TO OCCUR.

Narrative: AN ACR Y ACFT HAD BEEN TURNED AND DSNDED OUT OF 5000 FT FOR 3000 FT. ACR X (THE B737) AT 5000 FT WBOUND ADVISED HE WAS RESPONDING TO AN RA AND DSNDED INTO THE ACR Y ALSO DSNDING.

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.