An medium large transport responded to a TCASII command to climb. The traffic had been announced by ATC but was not seen visually.

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Attributes
ACN	222464
Time
Date	199210
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mol
State Reference	VA
Altitude	msl bound lower : 24000 msl bound upper : 24600
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 1000
ASRS Report	222464
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cruise at FL240. Autoplt engaged. ATC traffic callout -- 'traffic 1230 O'clock, 15 mi, FL230' -- noted on TCASII. No visual contact -- wbound into the sun. Momentarily, RA climb 1500 FPM. We climb to 24600 'clear of conflict.' advise ATC no visual on traffic.

Original NASA ASRS Text

Title: AN MLG RESPONDED TO A TCASII COMMAND TO CLB. THE TFC HAD BEEN ANNOUNCED BY ATC BUT WAS NOT SEEN VISUALLY.

Narrative: CRUISE AT FL240. AUTOPLT ENGAGED. ATC TFC CALLOUT -- 'TFC 1230 O'CLOCK, 15 MI, FL230' -- NOTED ON TCASII. NO VISUAL CONTACT -- WBOUND INTO THE SUN. MOMENTARILY, RA CLB 1500 FPM. WE CLB TO 24600 'CLR OF CONFLICT.' ADVISE ATC NO VISUAL ON TFC.

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.