Even though traffic was sighted, flight crew of an large transport climbed in response to a TCASII RA to assure separation of whatever was causing the TCASII warning.

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Attributes
ACN	328030
Time
Date	199602
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 7000 msl bound upper : 7200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl tower : bkf
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17000 flight time type : 7000
ASRS Report	328030
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Level at 7000 ft on vectors -- got a 'TA,' then a 'RA' to not descend. Visually saw the DC9 passing directly under us going from our 11 O'clock to 4 O'clock position. ATC (approach) advised us of aircraft just as it passed under us. First officer was flying and climbed 200 ft to 7200 ft. Even with the extra 200 ft the 'RA' continued until the DC9 had passed us.

Original NASA ASRS Text

Title: EVEN THOUGH TFC WAS SIGHTED, FLC OF AN LGT CLBED IN RESPONSE TO A TCASII RA TO ASSURE SEPARATION OF WHATEVER WAS CAUSING THE TCASII WARNING.

Narrative: LEVEL AT 7000 FT ON VECTORS -- GOT A 'TA,' THEN A 'RA' TO NOT DSND. VISUALLY SAW THE DC9 PASSING DIRECTLY UNDER US GOING FROM OUR 11 O'CLOCK TO 4 O'CLOCK POS. ATC (APCH) ADVISED US OF ACFT JUST AS IT PASSED UNDER US. FO WAS FLYING AND CLBED 200 FT TO 7200 FT. EVEN WITH THE EXTRA 200 FT THE 'RA' CONTINUED UNTIL THE DC9 HAD PASSED US.

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.