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

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Attributes
ACN	241506
Time
Date	199305
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ctf
State Reference	SC
Altitude	msl bound lower : 10800 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
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
Operator	other
Make Model Name	Fighter
Flight Phase	descent 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 : 100 flight time total : 9000 flight time type : 1500
ASRS Report	241506
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation 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
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We deviated from our assigned altitude of 12000 ft because of a TCASII RA. ZJX cleared a flight of 2 to descend to 13000 ft. However, both aircraft descended through 13000 at a rapid rate converging on our track and altitude. Our TCASII directed a descent which we immediately complied with. We stopped our descent when clear of conflict at 10800 ft. ZJX asked us to stay at 11000 ft. ZJX was advised as to the reason for the descent. We missed the aircraft by 500 ft and approximately 1/2 mi. Deviation from our altitude was absolutely necessary in order to avoid a possible midair.

Original NASA ASRS Text

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

Narrative: WE DEVIATED FROM OUR ASSIGNED ALT OF 12000 FT BECAUSE OF A TCASII RA. ZJX CLRED A FLT OF 2 TO DSND TO 13000 FT. HOWEVER, BOTH ACFT DSNDED THROUGH 13000 AT A RAPID RATE CONVERGING ON OUR TRACK AND ALT. OUR TCASII DIRECTED A DSCNT WHICH WE IMMEDIATELY COMPLIED WITH. WE STOPPED OUR DSCNT WHEN CLR OF CONFLICT AT 10800 FT. ZJX ASKED US TO STAY AT 11000 FT. ZJX WAS ADVISED AS TO THE REASON FOR THE DSCNT. WE MISSED THE ACFT BY 500 FT AND APPROX 1/2 MI. DEV FROM OUR ALT WAS ABSOLUTELY NECESSARY IN ORDER TO AVOID A POSSIBLE MIDAIR.

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.