TCASII RA at 17000 ft near CCC VOR.

Attributes
ACN	442590
Time
Date	199907
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : ccc.vor
State Reference	NY
Altitude	msl bound lower : 16700 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	departure sid : cstl one
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	VFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 13600 flight time type : 1500
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude
Miss Distance	vertical : 400
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flying the stl 1 departure from bdl. ZBW had us level at 17000 ft. A VFR commuter was at 17500 ft and may have descended to 17400 ft. We got a TCASII RA and descended to 16700 ft and when clear of conflict, returned to 17000 ft. Advised ZBW at the time of a TCASII descent and they did not respond.

Original NASA ASRS Text

Title: TCASII RA AT 17000 FT NEAR CCC VOR.

Narrative: FLYING THE STL 1 DEP FROM BDL. ZBW HAD US LEVEL AT 17000 FT. A VFR COMMUTER WAS AT 17500 FT AND MAY HAVE DSNDED TO 17400 FT. WE GOT A TCASII RA AND DSNDED TO 16700 FT AND WHEN CLR OF CONFLICT, RETURNED TO 17000 FT. ADVISED ZBW AT THE TIME OF A TCASII DSCNT AND THEY DID NOT RESPOND.

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.