Air carrier came in close proximity to a widebody transport.

Attributes
ACN	124930
Time
Date	198910
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : aml airport : iad
State Reference	VA
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other enroute airway : iad
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 310 flight time total : 6040 flight time type : 310
ASRS Report	124930
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We had just been assigned a frequency change to dulles approach. The controller ignored our multiple (6) calls. He was working 2 frequencys and was very busy. We observed air carrier Y climbing from below us. We watched him level off at 11000' MSL in close proximity. At the time we were on a vector expecting to intercept J220. I would not recommend operation in a high density terminal with a controller who is operating on 2 discrete frequencys.

Original NASA ASRS Text

Title: ACR CAME IN CLOSE PROX TO A WDB.

Narrative: WE HAD JUST BEEN ASSIGNED A FREQ CHANGE TO DULLES APCH. THE CTLR IGNORED OUR MULTIPLE (6) CALLS. HE WAS WORKING 2 FREQS AND WAS VERY BUSY. WE OBSERVED ACR Y CLBING FROM BELOW US. WE WATCHED HIM LEVEL OFF AT 11000' MSL IN CLOSE PROX. AT THE TIME WE WERE ON A VECTOR EXPECTING TO INTERCEPT J220. I WOULD NOT RECOMMEND OPERATION IN A HIGH DENSITY TERMINAL WITH A CTLR WHO IS OPERATING ON 2 DISCRETE FREQS.

Data retrieved from NASA's ASRS site as of August 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.