Large transport flight crew responds to TCASII RA. Altitude deviation.

Attributes
ACN	197429
Time
Date	199112
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lga
State Reference	NY
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 15000 flight time type : 11000
ASRS Report	197429
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 5000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Near somto intersection at 11000 ft, controller reported VFR traffic at 10500 ft. TCASII alarmed and showed traffic 400 ft below our altitude and commanded climb. Initiated climb to assure 500 ft separation. Exceeded assigned altitude 200-300 ft. Returned to 11000 ft after conflict cleared.

Original NASA ASRS Text

Title: LGT FLT CREW RESPONDS TO TCASII RA. ALTDEV.

Narrative: NEAR SOMTO INTXN AT 11000 FT, CTLR RPTED VFR TFC AT 10500 FT. TCASII ALARMED AND SHOWED TFC 400 FT BELOW OUR ALT AND COMMANDED CLB. INITIATED CLB TO ASSURE 500 FT SEPARATION. EXCEEDED ASSIGNED ALT 200-300 FT. RETURNED TO 11000 FT AFTER CONFLICT CLRED.

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.