<< >> NASA ASRS Report 547834, May 2002

ZID ARTCC radar controller unable to provide separation between 2 cargo aircraft descending into sdf and mem.

Attributes
ACN	547834
Time
Date	200205
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : pxv.vortac
State Reference	IN
Altitude	msl single value : 31000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid.artcc tower : pdx.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Route In Use	arrival star : wlder 4
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller time certified in position1 : 11 controller time certified in position2 : 10
ASRS Report	547834
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 1200
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier Y was on wlder 4 arrival to mem at FL310. Air carrier X was descending into sdf. Air carrier X was not issued the LOA altitude and I tried to descend him through air carrier Y's altitude with a higher rate of descent.

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Original NASA ASRS Text

Title: ZID ARTCC RADAR CTLR UNABLE TO PROVIDE SEPARATION BTWN 2 CARGO ACFT DSNDING INTO SDF AND MEM.

Narrative: ACR Y WAS ON WLDER 4 ARR TO MEM AT FL310. ACR X WAS DSNDING INTO SDF. ACR X WAS NOT ISSUED THE LOA ALT AND I TRIED TO DSND HIM THROUGH ACR Y'S ALT WITH A HIGHER RATE OF DSCNT.

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.