WW26 crew had near midair collision with unknown aircraft in ZDC class east airspace.

Attributes
ACN	517011
Time
Date	200106
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : swann
State Reference	VA
Altitude	msl single value : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc tower : dfw.tower
Operator	general aviation : corporate
Make Model Name	Israel Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute airway : v445.airway
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Make Model Name	Commercial Fixed Wing
Person 1
Affiliation	company : corporate
Function	flight crew : captain
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 3500 flight time type : 50
ASRS Report	517018
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 200
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Approaching swann intersection at 17000 ft in cruise, we received a TA for an aircraft at 16400 ft (TCASII altitude) to the northwest of our position. We were switching between ZDC sectors at the time of the TA. No advisory was given by either center sectors. The aircraft then began a climb and it was at this time we received an RA. Upon receiving the RA, a climb was initiated per the TCASII altitude of the other aircraft reached 16800 ft during the RA response. The RA climbed us up to FL185. Contact was made with the new ZDC sector during the RA climb advising them of the RA and altitude deviation. Upon inquiring the controller, he advised us that he 'just sat down' and the other aircraft was under a different sector's control. No other communication regarding the situation was exchanged.

Original NASA ASRS Text

Title: WW26 CREW HAD NMAC WITH UNKNOWN ACFT IN ZDC CLASS E AIRSPACE.

Narrative: APCHING SWANN INTXN AT 17000 FT IN CRUISE, WE RECEIVED A TA FOR AN ACFT AT 16400 FT (TCASII ALT) TO THE NW OF OUR POS. WE WERE SWITCHING BTWN ZDC SECTORS AT THE TIME OF THE TA. NO ADVISORY WAS GIVEN BY EITHER CTR SECTORS. THE ACFT THEN BEGAN A CLB AND IT WAS AT THIS TIME WE RECEIVED AN RA. UPON RECEIVING THE RA, A CLB WAS INITIATED PER THE TCASII ALT OF THE OTHER ACFT REACHED 16800 FT DURING THE RA RESPONSE. THE RA CLBED US UP TO FL185. CONTACT WAS MADE WITH THE NEW ZDC SECTOR DURING THE RA CLB ADVISING THEM OF THE RA AND ALTDEV. UPON INQUIRING THE CTLR, HE ADVISED US THAT HE 'JUST SAT DOWN' AND THE OTHER ACFT WAS UNDER A DIFFERENT SECTOR'S CTL. NO OTHER COM REGARDING THE SIT WAS EXCHANGED.

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.