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

Attributes
ACN	186005
Time
Date	199108
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dxo
State Reference	OH
Altitude	msl bound lower : 13000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
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
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 radar : 6
ASRS Report	186045
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	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X became a conflict after detroit approach handoff on 1300 ft air carrier Y south of their boundary. Receiving controller planned to point out traffic and issue higher altitude to clear up conflict but got distraction by aircraft on wrong frequency, and did not follow through with plan thereby causing conflict. Main factor affecting quality of human performance was controller used sick leave 2 days before and still wasn't feeling well. Controller asked to go home on leave because not feeling well. Incident occurred 1 hour after request. Leave was approved at time of request in 1 hour.

Original NASA ASRS Text

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

Narrative: ACR X BECAME A CONFLICT AFTER DETROIT APCH HDOF ON 1300 FT ACR Y S OF THEIR BOUNDARY. RECEIVING CTLR PLANNED TO POINT OUT TFC AND ISSUE HIGHER ALT TO CLR UP CONFLICT BUT GOT DISTR BY ACFT ON WRONG FREQ, AND DID NOT FOLLOW THROUGH WITH PLAN THEREBY CAUSING CONFLICT. MAIN FACTOR AFFECTING QUALITY OF HUMAN PERFORMANCE WAS CTLR USED SICK LEAVE 2 DAYS BEFORE AND STILL WASN'T FEELING WELL. CTLR ASKED TO GO HOME ON LEAVE BECAUSE NOT FEELING WELL. INCIDENT OCCURRED 1 HR AFTER REQUEST. LEAVE WAS APPROVED AT TIME OF REQUEST IN 1 HR.

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.