Close proximity less than standard separation air carrier-large transport air carrier-medium large transport opposite direction working iad approach control.

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Attributes
ACN	156277
Time
Date	199009
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : aml airport : dca
State Reference	VA
Altitude	msl bound lower : 12500 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 6715 flight time type : 650
ASRS Report	156277
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 70
ASRS Report	155645
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Approaching armel VOR from the west inbound to dca controller gave us a clearance to turn left to 360 degrees and level at 13000'. The previous clearance was to 11000' and we were at 12500'. We stated we were at 12500' and immediately began a climb to 13000'. Very shortly thereafter an air carrier Q medium large transport passed directly beneath us at 12000'. The air carrier Q crew questioned our altitude and the controller said we were at 13000'. The controller said he had given us the heading earlier. We heard a garble transmission re: a heading. When we asked who that clearance was for, we received no reply. When controllers and pilots make statements or issue clrncs, it is extremely important to listen for a proper acknowledgement.

Original NASA ASRS Text

Title: CLOSE PROX LESS THAN STANDARD SEPARATION ACR-LGT ACR-MLG OPPOSITE DIRECTION WORKING IAD APCH CTL.

Narrative: APCHING ARMEL VOR FROM THE W INBND TO DCA CTLR GAVE US A CLRNC TO TURN LEFT TO 360 DEGS AND LEVEL AT 13000'. THE PREVIOUS CLRNC WAS TO 11000' AND WE WERE AT 12500'. WE STATED WE WERE AT 12500' AND IMMEDIATELY BEGAN A CLB TO 13000'. VERY SHORTLY THEREAFTER AN ACR Q MLG PASSED DIRECTLY BENEATH US AT 12000'. THE ACR Q CREW QUESTIONED OUR ALT AND THE CTLR SAID WE WERE AT 13000'. THE CTLR SAID HE HAD GIVEN US THE HDG EARLIER. WE HEARD A GARBLE XMISSION RE: A HDG. WHEN WE ASKED WHO THAT CLRNC WAS FOR, WE RECEIVED NO REPLY. WHEN CTLRS AND PLTS MAKE STATEMENTS OR ISSUE CLRNCS, IT IS EXTREMELY IMPORTANT TO LISTEN FOR A PROPER ACKNOWLEDGEMENT.

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.