Air carrier X TCASII RA non adherence to ATC clearance unauthorized descent from assigned altitude had less than standard separation from cpr Y. Pilot deviation.

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Attributes
ACN	248328
Time
Date	199308
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rmg
State Reference	GA
Altitude	msl bound lower : 20500 msl bound upper : 20500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 9
ASRS Report	248328
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X descending to FL210. Cpr Y level at FL200. Traffic issued to both aircraft. Cpr Y reports air carrier X in sight. Air carrier X turned for sequencing to atl. Air carrier X descended to FL205. Air carrier X advised cpr Y in sight prior to descending. Air carrier X advised they had responded to a TCASII RA. I believe TCASII caused the confliction. There was no other traffic in the vicinity. TCASII should be modified to include assigned altitude so aircraft will not take evasive action from other aircraft ATC has already provided separation from.

Original NASA ASRS Text

Title: ACR X TCASII RA NON ADHERENCE TO ATC CLRNC UNAUTH DSCNT FROM ASSIGNED ALT HAD LTSS FROM CPR Y. PLTDEV.

Narrative: ACR X DSNDING TO FL210. CPR Y LEVEL AT FL200. TFC ISSUED TO BOTH ACFT. CPR Y RPTS ACR X IN SIGHT. ACR X TURNED FOR SEQUENCING TO ATL. ACR X DSNDED TO FL205. ACR X ADVISED CPR Y IN SIGHT PRIOR TO DSNDING. ACR X ADVISED THEY HAD RESPONDED TO A TCASII RA. I BELIEVE TCASII CAUSED THE CONFLICTION. THERE WAS NO OTHER TFC IN THE VICINITY. TCASII SHOULD BE MODIFIED TO INCLUDE ASSIGNED ALT SO ACFT WILL NOT TAKE EVASIVE ACTION FROM OTHER ACFT ATC HAS ALREADY PROVIDED SEPARATION FROM.

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.