Air carrier X had near midair collision and less than standard separation from air carrier Y. System...

Attributes
ACN	162876
Time
Date	199011
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dca
State Reference	DC
Altitude	msl bound lower : 1600 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dca
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 216 flight time total : 24000 flight time type : 14000
ASRS Report	162876
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated faa : reviewed incident with flight crew
Miss Distance	vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

Air carrier X cleared for ILS approach runway 36 at dca. Told traffic we were following was 6 mi ahead, 'keep speed up to OM.' at OM saw air carrier Y, medium large transport in a right descending turn heading directly at my aircraft. Tower was calling him but he did not reply. Talked to tower supervisor, he said a lack of coordination between approach controllers (west and east) allowed error and aircraft was cleared into what the east controller thought was a clear slot for an approach.

Original NASA ASRS Text

Title: ACR X HAD NMAC AND LESS THAN STANDARD SEPARATION FROM ACR Y. SYSTEM ERROR.

Narrative: ACR X CLRED FOR ILS APCH RWY 36 AT DCA. TOLD TFC WE WERE FOLLOWING WAS 6 MI AHEAD, 'KEEP SPD UP TO OM.' AT OM SAW ACR Y, MLG IN A R DSNDING TURN HDG DIRECTLY AT MY ACFT. TWR WAS CALLING HIM BUT HE DID NOT REPLY. TALKED TO TWR SUPVR, HE SAID A LACK OF COORD BTWN APCH CTLRS (W AND E) ALLOWED ERROR AND ACFT WAS CLRED INTO WHAT THE E CTLR THOUGHT WAS A CLR SLOT FOR AN APCH.

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.

Air carrier X had near midair collision and less than standard separation from air carrier Y. System error.