Operational error between air carrier X and air carrier Z.

Attributes
ACN	291905
Time
Date	199412
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bvt
State Reference	IN
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller military : 4 controller radar : 10
ASRS Report	291905
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

In sum: air carrier X was northbound on J-89 approaching bvt on a converging course with air carrier Y wbound approaching bvt at the same altitude, FL350. Air carrier Z, also at FL350, was wbound approaching the bvt area. Air carrier X was turned to go behind air carrier Y but due to the upper winds, increased speed requiring a turn from 010 degrees to 030 degrees. Air carrier X now became potential traffic for air carrier Z and was given a left turn to 340 degrees. Air carrier Z was given an initial left turn to 220 degrees followed by a turn to 180 degrees. Air carrier X was slow in the left turn and received a TCASII alert from which evasive action was taken requiring a climb to FL370. This was reported to the controller who then assigned air carrier X FL370. An attempt was made earlier to climb air carrier Z to FL370 but the flight crew was unable to accept that altitude. Reporter believes that air carrier X should have been descended and then vectored by behind air carrier Z.

Original NASA ASRS Text

Title: OPERROR BTWN ACR X AND ACR Z.

Narrative: IN SUM: ACR X WAS NBOUND ON J-89 APCHING BVT ON A CONVERGING COURSE WITH ACR Y WBOUND APCHING BVT AT THE SAME ALT, FL350. ACR Z, ALSO AT FL350, WAS WBOUND APCHING THE BVT AREA. ACR X WAS TURNED TO GO BEHIND ACR Y BUT DUE TO THE UPPER WINDS, INCREASED SPD REQUIRING A TURN FROM 010 DEGS TO 030 DEGS. ACR X NOW BECAME POTENTIAL TFC FOR ACR Z AND WAS GIVEN A L TURN TO 340 DEGS. ACR Z WAS GIVEN AN INITIAL L TURN TO 220 DEGS FOLLOWED BY A TURN TO 180 DEGS. ACR X WAS SLOW IN THE L TURN AND RECEIVED A TCASII ALERT FROM WHICH EVASIVE ACTION WAS TAKEN REQUIRING A CLB TO FL370. THIS WAS RPTED TO THE CTLR WHO THEN ASSIGNED ACR X FL370. AN ATTEMPT WAS MADE EARLIER TO CLB ACR Z TO FL370 BUT THE FLC WAS UNABLE TO ACCEPT THAT ALT. RPTR BELIEVES THAT ACR X SHOULD HAVE BEEN DSNDED AND THEN VECTORED BY BEHIND ACR Z.

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.