Evasive action in a climb maneuver by an ATR72 PIC when receiving a TCASII RA from a climbing B757/B767 10 mi southwest of atl, GA.

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Attributes
ACN	611499
Time
Date	200403
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl bound lower : 11000 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon tower : eidw.tower
Operator	common carrier : air carrier
Make Model Name	ATR 72
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : la grange
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	Boeing Company Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 3500 flight time type : 3000
ASRS Report	611499
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 12000 vertical : 1000
Supplementary
Problem Areas	Aircraft ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

At stated time and place, the following occurred nearly simultaneously: I saw a B757/767 at our 10 O'clock position, climbing left to right. The first officer saw the traffic. ATC called out the traffic. The TCASII went right to an RA of 'climb, climb.' due to the simultaneous nature of all these indications, I elected to comply with the RA. Just as ATC finished their TA that the traffic was leveling at 10000 ft, the RA stopped. We leveled off at 11500 ft and I instructed the first officer to inform ATC of our actions. As per ATC instructions, we descended back down to 11000 ft and continued the STAR. My experience tells me the B767/757 was light and had favorable winds, resulting in better than expected climb performance, which is why ATC did not alert us earlier.

Original NASA ASRS Text

Title: EVASIVE ACTION IN A CLB MANEUVER BY AN ATR72 PIC WHEN RECEIVING A TCASII RA FROM A CLBING B757/B767 10 MI SW OF ATL, GA.

Narrative: AT STATED TIME AND PLACE, THE FOLLOWING OCCURRED NEARLY SIMULTANEOUSLY: I SAW A B757/767 AT OUR 10 O'CLOCK POS, CLBING L TO R. THE FO SAW THE TFC. ATC CALLED OUT THE TFC. THE TCASII WENT RIGHT TO AN RA OF 'CLB, CLB.' DUE TO THE SIMULTANEOUS NATURE OF ALL THESE INDICATIONS, I ELECTED TO COMPLY WITH THE RA. JUST AS ATC FINISHED THEIR TA THAT THE TFC WAS LEVELING AT 10000 FT, THE RA STOPPED. WE LEVELED OFF AT 11500 FT AND I INSTRUCTED THE FO TO INFORM ATC OF OUR ACTIONS. AS PER ATC INSTRUCTIONS, WE DSNDED BACK DOWN TO 11000 FT AND CONTINUED THE STAR. MY EXPERIENCE TELLS ME THE B767/757 WAS LIGHT AND HAD FAVORABLE WINDS, RESULTING IN BETTER THAN EXPECTED CLB PERFORMANCE, WHICH IS WHY ATC DID NOT ALERT US EARLIER.

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.