<< >> NASA ASRS Report 107084, March 1989

Large transport made an unexpected turn which resulted in the second aircraft at same altitude to overtake the large transport.

Attributes
ACN	107084
Time
Date	198903
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sat
State Reference	TX
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 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
ASRS Report	107084
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : radar
ASRS Report	106923
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Many aircraft were deviating for WX and air carrier X was given a reroute by the adjacent sector and the route was not put into the computer. I was working the sat high altitude sector at the time. When air carrier X was handed to me about 25 NM north of stv VORTAC he was being followed by air carrier Y at the same altitude at air carrier X's 7-8 O'clock position and about 8-10 mi behind. We were working 26 aircraft and turned away some others. We were not aware that air carrier X was going to turn eastbound at stv. When air carrier X made his turn, air carrier Y overtook air carrier X. Both aircraft were issued turns but not in time to prevent loss of sep. I feel this occurred due to having 2 aircraft given to me by the adjacent sector that were cleared in a way that sep would cease soon after entering my airspace and I was not informed as to the route of flight these aircraft were on.

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Original NASA ASRS Text

Title: LGT MADE AN UNEXPECTED TURN WHICH RESULTED IN THE SECOND ACFT AT SAME ALT TO OVERTAKE THE LGT.

Narrative: MANY ACFT WERE DEVIATING FOR WX AND ACR X WAS GIVEN A REROUTE BY THE ADJACENT SECTOR AND THE ROUTE WAS NOT PUT INTO THE COMPUTER. I WAS WORKING THE SAT HIGH ALT SECTOR AT THE TIME. WHEN ACR X WAS HANDED TO ME ABOUT 25 NM N OF STV VORTAC HE WAS BEING FOLLOWED BY ACR Y AT THE SAME ALT AT ACR X'S 7-8 O'CLOCK POS AND ABOUT 8-10 MI BEHIND. WE WERE WORKING 26 ACFT AND TURNED AWAY SOME OTHERS. WE WERE NOT AWARE THAT ACR X WAS GOING TO TURN EBND AT STV. WHEN ACR X MADE HIS TURN, ACR Y OVERTOOK ACR X. BOTH ACFT WERE ISSUED TURNS BUT NOT IN TIME TO PREVENT LOSS OF SEP. I FEEL THIS OCCURRED DUE TO HAVING 2 ACFT GIVEN TO ME BY THE ADJACENT SECTOR THAT WERE CLRED IN A WAY THAT SEP WOULD CEASE SOON AFTER ENTERING MY AIRSPACE AND I WAS NOT INFORMED AS TO THE ROUTE OF FLT THESE ACFT WERE ON.

Data retrieved from NASA's ASRS site as of August 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.