Evasive action climb. Air carrier reacts to a TCASII RA, but does not see the intruder. The controller reported that a VFR aircraft was in the area, but the flight crew doubts that it was the correct aircraft.

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Attributes
ACN	305130
Time
Date	199505
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mxe
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny tracon : pvd
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zny
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 205 flight time total : 11500 flight time type : 3100
ASRS Report	305130
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7800 flight time type : 1000
ASRS Report	305129
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 700
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Aircraft being flown by captain, we leveled off at 10000 ft and switched to ZNY, 133.67 for higher. TCASII subject appeared on screen at 12 O'clock exactly same altitude. TA then transformed into an RA 'climb, climb, climb.' could not make visual contact. Captain disconnected autoplt and followed RA as per procedure, doing a perfect example. ATC was advised by first officer that we left our assigned altitude due to TCASII RA. ATC was very unconcerned, never called traffic and then said it was a 10500 ft VFR cruise, which it was not. ATC then cleared us to 14000 ft, as if nothing happened. Without TCASII, the writer (first officer) believes this would have been a most probable collision.

Original NASA ASRS Text

Title: EVASIVE ACTION CLB. ACR REACTS TO A TCASII RA, BUT DOES NOT SEE THE INTRUDER. THE CTLR RPTED THAT A VFR ACFT WAS IN THE AREA, BUT THE FLC DOUBTS THAT IT WAS THE CORRECT ACFT.

Narrative: ACFT BEING FLOWN BY CAPT, WE LEVELED OFF AT 10000 FT AND SWITCHED TO ZNY, 133.67 FOR HIGHER. TCASII SUBJECT APPEARED ON SCREEN AT 12 O'CLOCK EXACTLY SAME ALT. TA THEN TRANSFORMED INTO AN RA 'CLB, CLB, CLB.' COULD NOT MAKE VISUAL CONTACT. CAPT DISCONNECTED AUTOPLT AND FOLLOWED RA AS PER PROC, DOING A PERFECT EXAMPLE. ATC WAS ADVISED BY FO THAT WE LEFT OUR ASSIGNED ALT DUE TO TCASII RA. ATC WAS VERY UNCONCERNED, NEVER CALLED TFC AND THEN SAID IT WAS A 10500 FT VFR CRUISE, WHICH IT WAS NOT. ATC THEN CLRED US TO 14000 FT, AS IF NOTHING HAPPENED. WITHOUT TCASII, THE WRITER (FO) BELIEVES THIS WOULD HAVE BEEN A MOST PROBABLE COLLISION.

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.