Near midair collision avoided as TCASII RA reduces incident to a potential conflict.

Attributes
ACN	285344
Time
Date	199410
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : huo
State Reference	NY
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	MU-2 Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 9000 flight time type : 300
ASRS Report	285344
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 255 flight time total : 4000 flight time type : 2000
ASRS Report	285505
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : far other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cruise phase of flight. TCASII annunciated 'RA, climb.' displayed as 12 O'clock and 11800 ft. I disconnected the autoplt and immediately pitched up to achieve rate of climb as shown on the vsi green arc (1500 FPM). New york controller never called the traffic. We did not sight the intruder until they were past us. No loss of separation despite deviating 1000 ft from our assigned altitude. TCASII did not issue TA.

Original NASA ASRS Text

Title: NMAC AVOIDED AS TCASII RA REDUCES INCIDENT TO A POTENTIAL CONFLICT.

Narrative: CRUISE PHASE OF FLT. TCASII ANNUNCIATED 'RA, CLB.' DISPLAYED AS 12 O'CLOCK AND 11800 FT. I DISCONNECTED THE AUTOPLT AND IMMEDIATELY PITCHED UP TO ACHIEVE RATE OF CLB AS SHOWN ON THE VSI GREEN ARC (1500 FPM). NEW YORK CTLR NEVER CALLED THE TFC. WE DID NOT SIGHT THE INTRUDER UNTIL THEY WERE PAST US. NO LOSS OF SEPARATION DESPITE DEVIATING 1000 FT FROM OUR ASSIGNED ALT. TCASII DID NOT ISSUE TA.

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.