Atx X TCASII RA evasive action taken had less than standard separation from air carrier Y TCASII RA.

Attributes
ACN	212762
Time
Date	199206
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : anc
State Reference	AK
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : anc tower : stl
Operator	common carrier : air taxi
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	212762
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Atx X departed anc international airport runway 32 SID heading 300 degrees climbing to 5000 MSL. Alphanumeric sector identifier appeared (tagged) on scope as an 'south,' rather than an 'north' due to incorrect computer confign, an ATC human error. Atx X was idented and turned west maintaining 5000 MSL. Inbound air carrier Y descending for approach to runway 06R from the northwest cleared to 2000 ft MSL and on south radar frequency heading approximately 150 was on converging course in north radar sector airspace. Atx X was heading 260. North radar transferred communication with atx X to south controller. South controller was on 2 frequencys, working south departure sector combined with final radar, sequencing 6 or more aircraft, all types and speeds, to runway 06R final. Time of day required that the sectors be decombined. A poor decision to combine sectors was made by a non-area rated area manager. The conflict occurred in north radar airspace. South controller missed traffic pointout to air carrier Y he was working into the final sequence. When atx X first came on south departure frequency he advised he had just deviated from assigned altitude for a TCASII advisory. Air carrier Y pilot later called on telephone and said he received a TCASII alert but did not respond as he had visual contact with atx X. Visual separation was not applied by ATC. When south controller heard atx X transmission, he observed both aircraft less than 3 mi/1000 ft vertical separation, flight paths crossed.

Original NASA ASRS Text

Title: ATX X TCASII RA EVASIVE ACTION TAKEN HAD LTSS FROM ACR Y TCASII RA.

Narrative: ATX X DEPARTED ANC INTL ARPT RWY 32 SID HDG 300 DEGS CLBING TO 5000 MSL. ALPHANUMERIC SECTOR IDENTIFIER APPEARED (TAGGED) ON SCOPE AS AN 'S,' RATHER THAN AN 'N' DUE TO INCORRECT COMPUTER CONFIGN, AN ATC HUMAN ERROR. ATX X WAS IDENTED AND TURNED W MAINTAINING 5000 MSL. INBOUND ACR Y DSNDING FOR APCH TO RWY 06R FROM THE NW CLRED TO 2000 FT MSL AND ON S RADAR FREQ HDG APPROX 150 WAS ON CONVERGING COURSE IN N RADAR SECTOR AIRSPACE. ATX X WAS HDG 260. N RADAR TRANSFERRED COM WITH ATX X TO S CTLR. S CTLR WAS ON 2 FREQS, WORKING S DEP SECTOR COMBINED WITH FINAL RADAR, SEQUENCING 6 OR MORE ACFT, ALL TYPES AND SPDS, TO RWY 06R FINAL. TIME OF DAY REQUIRED THAT THE SECTORS BE DECOMBINED. A POOR DECISION TO COMBINE SECTORS WAS MADE BY A NON-AREA RATED AREA MGR. THE CONFLICT OCCURRED IN N RADAR AIRSPACE. S CTLR MISSED TFC POINTOUT TO ACR Y HE WAS WORKING INTO THE FINAL SEQUENCE. WHEN ATX X FIRST CAME ON S DEP FREQ HE ADVISED HE HAD JUST DEVIATED FROM ASSIGNED ALT FOR A TCASII ADVISORY. ACR Y PLT LATER CALLED ON TELEPHONE AND SAID HE RECEIVED A TCASII ALERT BUT DID NOT RESPOND AS HE HAD VISUAL CONTACT WITH ATX X. VISUAL SEPARATION WAS NOT APPLIED BY ATC. WHEN S CTLR HEARD ATX X XMISSION, HE OBSERVED BOTH ACFT LESS THAN 3 MI/1000 FT VERT SEPARATION, FLT PATHS CROSSED.

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.