Air carrier takes evasive action as approved by ATC to avoid VFR traffic.

Attributes
ACN	169408
Time
Date	199102
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : aml
State Reference	VA
Altitude	msl bound lower : 10000 msl bound upper : 10200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : on vectors enroute airway : iad
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 129 flight time total : 9200 flight time type : 622
ASRS Report	169408
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Had just leveled off at 10000' 250 KIAS proceeding direct armel VOR for landing at dulles. Approximately 35 mi northwest dulles approach called traffic advisory and to turn to heading 270 degree (approximately 60 degree to right) turn was initiated using manual turn knob of autoplt turn rate was very slow. Simultaneously we spotted aircraft a 12:00 closing, controller advised we could climb as necessary, autoplt was disconnected and manual 30 degree bank climbing turn of approximately 300' was made. Aircraft passed below and to the left of us. Approach advised us the other aircraft was at an IFR altitude squawking VFR and had also violated camp david airspace. Controller also advised his mode C equipment showed us at 10200' and other aircraft at 9900'. We had our landing lights and runway turnoff lights illuminated at the time. It did not appear other aircraft took evasive action.

Original NASA ASRS Text

Title: ACR TAKES EVASIVE ACTION AS APPROVED BY ATC TO AVOID VFR TRAFFIC.

Narrative: HAD JUST LEVELED OFF AT 10000' 250 KIAS PROCEEDING DIRECT ARMEL VOR FOR LNDG AT DULLES. APPROX 35 MI NW DULLES APCH CALLED TFC ADVISORY AND TO TURN TO HDG 270 DEG (APPROX 60 DEG TO R) TURN WAS INITIATED USING MANUAL TURN KNOB OF AUTOPLT TURN RATE WAS VERY SLOW. SIMULTANEOUSLY WE SPOTTED ACFT A 12:00 CLOSING, CTLR ADVISED WE COULD CLB AS NECESSARY, AUTOPLT WAS DISCONNECTED AND MANUAL 30 DEG BANK CLBING TURN OF APPROX 300' WAS MADE. ACFT PASSED BELOW AND TO THE L OF US. APCH ADVISED US THE OTHER ACFT WAS AT AN IFR ALT SQUAWKING VFR AND HAD ALSO VIOLATED CAMP DAVID AIRSPACE. CTLR ALSO ADVISED HIS MODE C EQUIP SHOWED US AT 10200' AND OTHER ACFT AT 9900'. WE HAD OUR LNDG LIGHTS AND RWY TURNOFF LIGHTS ILLUMINATED AT THE TIME. IT DID NOT APPEAR OTHER ACFT TOOK EVASIVE ACTION.

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.