Close proximity air carrier-medium large transport GA-small aircraft near aml VOR.

Attributes
ACN	198452
Time
Date	199201
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 120 flight time total : 10000 flight time type : 1450
ASRS Report	198452
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was captain on flight iad-bdl on departure from dulles level at 10000 ft MSL. Dulles departure control had alerted a small aircraft (heading 350 degrees) of 'traffic at 11 O'clock, level 10000 ft, an air carrier medium large transport.' I took this to be our aircraft but departure did not call the small aircraft out to us. Our TCASII then gave us a TA. We were given a right turn to 060 degrees and in this turn out TCASII gave us an RA directing a 'climb, climb' command of at least 2000 FPM. I initiated a climb in the turn up to about 10500 ft MSL. When our TCASII gave a 'clear of conflict' I descended back to 10000 ft and advised departure of what we had done and the reason (TCASII RA command). The target on our scope got to within 200 ft (-02) and (estimated) horizontally 1/2 mi. I do not know how this near midair collision occurred. It does seem that the controller should have pointed out the traffic earlier and to both aircraft.

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMA NEAR AML VOR.

Narrative: I WAS CAPT ON FLT IAD-BDL ON DEP FROM DULLES LEVEL AT 10000 FT MSL. DULLES DEP CTL HAD ALERTED A SMALL ACFT (HDG 350 DEGS) OF 'TFC AT 11 O'CLOCK, LEVEL 10000 FT, AN ACR MLG.' I TOOK THIS TO BE OUR ACFT BUT DEP DID NOT CALL THE SMALL ACFT OUT TO US. OUR TCASII THEN GAVE US A TA. WE WERE GIVEN A R TURN TO 060 DEGS AND IN THIS TURN OUT TCASII GAVE US AN RA DIRECTING A 'CLB, CLB' COMMAND OF AT LEAST 2000 FPM. I INITIATED A CLB IN THE TURN UP TO ABOUT 10500 FT MSL. WHEN OUR TCASII GAVE A 'CLR OF CONFLICT' I DSNDED BACK TO 10000 FT AND ADVISED DEP OF WHAT WE HAD DONE AND THE REASON (TCASII RA COMMAND). THE TARGET ON OUR SCOPE GOT TO WITHIN 200 FT (-02) AND (ESTIMATED) HORIZLY 1/2 MI. I DO NOT KNOW HOW THIS NMAC OCCURRED. IT DOES SEEM THAT THE CTLR SHOULD HAVE POINTED OUT THE TFC EARLIER AND TO BOTH ACFT.

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.