Flight crew of an medium large transport air carrier aircraft deviated from assigned altitude in response to a TCASII RA.

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Attributes
ACN	248281
Time
Date	199308
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fst
State Reference	TX
Altitude	msl bound lower : 34500 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 8000
ASRS Report	248281
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude 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	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

We were in cruise flight at FL350 and received a TCASII TA followed immediately by an RA alert giving us approximately a 2000 FPM descent rate which we immediately followed. We advised ATC and they cleared us to FL310. ATC advised there was no observed traffic within 12 mi of our location, but understood our need to follow the RA and that there was no conflict observed. We never saw any traffic which showed to be at our altitude at 6 O'clock, almost right at us.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: WE WERE IN CRUISE FLT AT FL350 AND RECEIVED A TCASII TA FOLLOWED IMMEDIATELY BY AN RA ALERT GIVING US APPROX A 2000 FPM DSCNT RATE WHICH WE IMMEDIATELY FOLLOWED. WE ADVISED ATC AND THEY CLRED US TO FL310. ATC ADVISED THERE WAS NO OBSERVED TFC WITHIN 12 MI OF OUR LOCATION, BUT UNDERSTOOD OUR NEED TO FOLLOW THE RA AND THAT THERE WAS NO CONFLICT OBSERVED. WE NEVER SAW ANY TFC WHICH SHOWED TO BE AT OUR ALT AT 6 O'CLOCK, ALMOST RIGHT AT 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.