Potential less than standard separation over aml TCA inside dca 30 NM arc.

Attributes
ACN	199687
Time
Date	199201
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : aml airport : dca
State Reference	VA
Altitude	msl bound lower : 8000 msl bound upper : 9300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca tower : slc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time type : 4000
ASRS Report	199687
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While making a descent to cross armel at 8000 ft for a south river visual to dca we were out of 9500 when TCASII gave a TA approximately 4 mi opposite direction climbing approximately 700 ft below. ATC asked for a good rate to 8000. With throttles at idle and speed brakes deployed 250 KTS TCASII gave RA at same time controller issued an immediate right turn. TCASII issued a climb of approximately 1000-2000 FPM. I managed a climb to 9300 ft and right turn. I saw the other aircraft in a right turn same altitude approximately 1 mi and climbing. ATC said dulles was not talking to the other aircraft nor was he. ATC was extremely busy that day and the incident was not pursued on the radio for that reason.

Original NASA ASRS Text

Title: POTENTIAL LTSS OVER AML TCA INSIDE DCA 30 NM ARC.

Narrative: WHILE MAKING A DSCNT TO CROSS ARMEL AT 8000 FT FOR A S RIVER VISUAL TO DCA WE WERE OUT OF 9500 WHEN TCASII GAVE A TA APPROX 4 MI OPPOSITE DIRECTION CLBING APPROX 700 FT BELOW. ATC ASKED FOR A GOOD RATE TO 8000. WITH THROTTLES AT IDLE AND SPD BRAKES DEPLOYED 250 KTS TCASII GAVE RA AT SAME TIME CTLR ISSUED AN IMMEDIATE R TURN. TCASII ISSUED A CLB OF APPROX 1000-2000 FPM. I MANAGED A CLB TO 9300 FT AND R TURN. I SAW THE OTHER ACFT IN A R TURN SAME ALT APPROX 1 MI AND CLBING. ATC SAID DULLES WAS NOT TALKING TO THE OTHER ACFT NOR WAS HE. ATC WAS EXTREMELY BUSY THAT DAY AND THE INCIDENT WAS NOT PURSUED ON THE RADIO FOR THAT REASON.

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.