Air carrier Y overtake had less than standard separation from air carrier X. System error.

Attributes
ACN	313850
Time
Date	199508
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ith
State Reference	NY
Altitude	msl bound lower : 32000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
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 military : 4 controller radar : 8
ASRS Report	313850
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
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X and air carrier Y were handed off 6 mi in trail with speeds of .76 mach and not to exceed .76 mach respectively at FL330. Both aircraft were proceeding direct rka. Air carrier Z was wbound to FL310 proceeding direct dkk and requesting FL350. Z was climbed to FL350 and approximately 1 min later was turned 60 degree left for his climb to miss X. X was turned left to miss Z. When X was turned he lost speed and became traffic with Y. X was turned back direct rka and Y was descended to FL290 and turned left to 065 degrees. Separation was lost shortly afterward.

Original NASA ASRS Text

Title: ACR Y OVERTAKE HAD LTSS FROM ACR X. SYS ERROR.

Narrative: ACR X AND ACR Y WERE HANDED OFF 6 MI IN TRAIL WITH SPDS OF .76 MACH AND NOT TO EXCEED .76 MACH RESPECTIVELY AT FL330. BOTH ACFT WERE PROCEEDING DIRECT RKA. ACR Z WAS WBOUND TO FL310 PROCEEDING DIRECT DKK AND REQUESTING FL350. Z WAS CLBED TO FL350 AND APPROX 1 MIN LATER WAS TURNED 60 DEG L FOR HIS CLB TO MISS X. X WAS TURNED L TO MISS Z. WHEN X WAS TURNED HE LOST SPD AND BECAME TFC WITH Y. X WAS TURNED BACK DIRECT RKA AND Y WAS DSNDED TO FL290 AND TURNED L TO 065 DEGS. SEPARATION WAS LOST SHORTLY AFTERWARD.

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.