Air carrier widebody transport aircraft responded to TCASII RA.

Attributes
ACN	214983
Time
Date	199207
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : oal
State Reference	NV
Altitude	msl bound lower : 34000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc tower : swf
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 240 flight time total : 8000 flight time type : 1000
ASRS Report	214983
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude 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
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cruising at FL350 TCASII gave a 'traffic, traffic' alert. TCASII return showed target on scope about 10 mi ahead at our altitude. Return changed to red square and alert changed to 'descend, descend now.' descent carried out in green arc and ATC advised. At about FL340 ATC cleared us to FL240. RA return disappeared but no 'clear of conflict' signal. Requested and got clearance to maintain FL310.

Original NASA ASRS Text

Title: ACR WDB ACFT RESPONDED TO TCASII RA.

Narrative: CRUISING AT FL350 TCASII GAVE A 'TFC, TFC' ALERT. TCASII RETURN SHOWED TARGET ON SCOPE ABOUT 10 MI AHEAD AT OUR ALT. RETURN CHANGED TO RED SQUARE AND ALERT CHANGED TO 'DSND, DSND NOW.' DSCNT CARRIED OUT IN GREEN ARC AND ATC ADVISED. AT ABOUT FL340 ATC CLRED US TO FL240. RA RETURN DISAPPEARED BUT NO 'CLR OF CONFLICT' SIGNAL. REQUESTED AND GOT CLRNC TO MAINTAIN FL310.

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.