Large transport in IMC on climb has TCASII RA to descend.

Attributes
ACN	222323
Time
Date	199209
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : col
State Reference	NY
Altitude	msl bound lower : 16500 msl bound upper : 17000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny tower : mht
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 350 flight time total : 15000 flight time type : 10000
ASRS Report	222323
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation 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 : 12000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On climb out from lga (IMC, north of colts neck VOR, level 17000 ft, radar vectors). A TA was received on TCASII. Traffic was approximately 1 O'clock, 5 mi, 1300 ft below, and climbing. Our heading was 160 degrees when the first officer advised ATC of TA. Traffic conflict continued its climb and TCASII issued RA with 'descend' aural alert. First officer advised ATC of descent and controller directed us to maintain visual separation, turn left 090 degrees, and maintain 17000 ft. First officer stated we were in IMC and captain descended 500- ft and executed left turn. Traffic passed off our right wing, 2 mi and co-altitude. ATC (ZNY 124.75) was advised of our deviation and departure was resumed.

Original NASA ASRS Text

Title: LGT IN IMC ON CLB HAS TCASII RA TO DSND.

Narrative: ON CLBOUT FROM LGA (IMC, N OF COLTS NECK VOR, LEVEL 17000 FT, RADAR VECTORS). A TA WAS RECEIVED ON TCASII. TFC WAS APPROX 1 O'CLOCK, 5 MI, 1300 FT BELOW, AND CLBING. OUR HDG WAS 160 DEGS WHEN THE FO ADVISED ATC OF TA. TFC CONFLICT CONTINUED ITS CLB AND TCASII ISSUED RA WITH 'DSND' AURAL ALERT. FO ADVISED ATC OF DSCNT AND CTLR DIRECTED US TO MAINTAIN VISUAL SEPARATION, TURN L 090 DEGS, AND MAINTAIN 17000 FT. FO STATED WE WERE IN IMC AND CAPT DSNDED 500- FT AND EXECUTED L TURN. TFC PASSED OFF OUR R WING, 2 MI AND CO-ALT. ATC (ZNY 124.75) WAS ADVISED OF OUR DEV AND DEP WAS RESUMED.

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.