ARTCC radar controller vectored and climbed an air carrier B727 into a potential conflict with an air carrier B737 on a crossing course. Controller's subsequent vectors to both aircraft were insufficient to prevent a loss of separation. The aircraft both responded to their TCASII RA's and missed by 2 pt 5 NM and 700 ft.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	375632
Time
Date	199707
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lin
State Reference	CA
Altitude	msl bound lower : 30400 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa tower : dfw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	375632
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 was on heading 050 degrees and turned to heading 065 degrees for MVA. I noticed aircraft #2 at FL310. I turned aircraft #1 back to heading 050 degrees (aircraft #1 was leaving FL304 climbing). I turned aircraft #2 15 degrees left for traffic. Aircraft #1 asked if I still wanted him climbing to FL330. I was thinking he saw aircraft #2 on TCASII and for some reason thought traffic at FL330. I stopped aircraft #1 at FL310 and turned him back on course to MVA. I turned aircraft #2 back on course to btg. I suddenly noticed both aircraft were at FL310. I turned aircraft #1 to heading 130 degrees and started his climb. I turned aircraft #2 40 degrees right. Aircraft #1 got a TCASII RA and descended to FL290. I turned aircraft #1 further right to heading 160 degrees. The aircraft's closest proximity was 2 1/2 mi and 700 ft.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR VECTORED AND CLBED AN ACR B727 INTO A POTENTIAL CONFLICT WITH AN ACR B737 ON A XING COURSE. CTLR'S SUBSEQUENT VECTORS TO BOTH ACFT WERE INSUFFICIENT TO PREVENT A LOSS OF SEPARATION. THE ACFT BOTH RESPONDED TO THEIR TCASII RA'S AND MISSED BY 2 PT 5 NM AND 700 FT.

Narrative: ACFT #1 WAS ON HDG 050 DEGS AND TURNED TO HDG 065 DEGS FOR MVA. I NOTICED ACFT #2 AT FL310. I TURNED ACFT #1 BACK TO HDG 050 DEGS (ACFT #1 WAS LEAVING FL304 CLBING). I TURNED ACFT #2 15 DEGS L FOR TFC. ACFT #1 ASKED IF I STILL WANTED HIM CLBING TO FL330. I WAS THINKING HE SAW ACFT #2 ON TCASII AND FOR SOME REASON THOUGHT TFC AT FL330. I STOPPED ACFT #1 AT FL310 AND TURNED HIM BACK ON COURSE TO MVA. I TURNED ACFT #2 BACK ON COURSE TO BTG. I SUDDENLY NOTICED BOTH ACFT WERE AT FL310. I TURNED ACFT #1 TO HDG 130 DEGS AND STARTED HIS CLB. I TURNED ACFT #2 40 DEGS R. ACFT #1 GOT A TCASII RA AND DSNDED TO FL290. I TURNED ACFT #1 FURTHER R TO HDG 160 DEGS. THE ACFT'S CLOSEST PROX WAS 2 1/2 MI AND 700 FT.

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.