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

Attributes
ACN	176196
Time
Date	199104
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : idw
State Reference	IA
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 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
Experience	controller non radar : 2 controller radar : 7
ASRS Report	176196
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 19800 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

My trnee gave a descent clearance to air carrier X before establishing 5 mi vertical sep. The trner (myself) was distracted by my supervisor. During this time I missed the trnee's clearance. There was no time to take evasive action. Air carrier Y went behind air carrier X.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ACR Y. SYSTEM ERROR.

Narrative: MY TRNEE GAVE A DSNT CLRNC TO ACR X BEFORE ESTABLISHING 5 MI VERT SEP. THE TRNER (MYSELF) WAS DISTRACTED BY MY SUPVR. DURING THIS TIME I MISSED THE TRNEE'S CLRNC. THERE WAS NO TIME TO TAKE EVASIVE ACTION. ACR Y WENT BEHIND ACR X.

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.