Flight crew of a wide body took evasive action in response to a TCASII RA.

Attributes
ACN	286942
Time
Date	199410
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ztl airport : atl
State Reference	GA
Altitude	msl bound lower : 13000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute airway : ztl
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 182 flight time total : 6000 flight time type : 1880
ASRS Report	286942
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 22000
ASRS Report	286524
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During climb out of atl, passing 13000 ft, TCASII provided a TA followed immediately by a RA to climb. As soon as the rate of climb was in the green band (approximately 2000 FPM) the RA changed to descend. I followed the RA guidance and turned right after the captain spotted the aircraft and called for the turn. The twin beech passed to left and slightly above. It was surprising for TCASII to call for an increased climb rate followed immediately by a descent of greater than 3000 FPM. Our airspeed was 350 KTS and closure was rapid. We suspect the beech saw us first and initiated a climb. The turn the captain commanded helped a lot, but strict adherence to the RA command would have alone prevented a collision.

Original NASA ASRS Text

Title: FLC OF A WIDE BODY TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA.

Narrative: DURING CLBOUT OF ATL, PASSING 13000 FT, TCASII PROVIDED A TA FOLLOWED IMMEDIATELY BY A RA TO CLB. AS SOON AS THE RATE OF CLB WAS IN THE GREEN BAND (APPROX 2000 FPM) THE RA CHANGED TO DSND. I FOLLOWED THE RA GUIDANCE AND TURNED R AFTER THE CAPT SPOTTED THE ACFT AND CALLED FOR THE TURN. THE TWIN BEECH PASSED TO L AND SLIGHTLY ABOVE. IT WAS SURPRISING FOR TCASII TO CALL FOR AN INCREASED CLB RATE FOLLOWED IMMEDIATELY BY A DSCNT OF GREATER THAN 3000 FPM. OUR AIRSPD WAS 350 KTS AND CLOSURE WAS RAPID. WE SUSPECT THE BEECH SAW US FIRST AND INITIATED A CLB. THE TURN THE CAPT COMMANDED HELPED A LOT, BUT STRICT ADHERENCE TO THE RA COMMAND WOULD HAVE ALONE PREVENTED A COLLISION.

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.