ZKC controller obtains alarm indicating aircraft in conflict at FL230. When questioned, controller verifies both aircraft are at their assigned, vertically separated altitude.

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Attributes
ACN	531403
Time
Date	200111
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : emp.vortac
State Reference	KS
Altitude	msl bound lower : 23000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zkc.artcc
Operator	general aviation : corporate
Make Model Name	Falcon 20FJF/20C/20D/20E/20F
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zkc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 17
ASRS Report	531403
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Problem Areas	Navigational Facility
Primary Problem	Navigational Facility

Narrative:

FA20 checked on descending to FL240. B737 was level at FL230. Conflict alert went off and FA20 mode C indicated FL230. When asked assigned altitude, he reported level FL240.

Original NASA ASRS Text

Title: ZKC CTLR OBTAINS ALARM INDICATING ACFT IN CONFLICT AT FL230. WHEN QUESTIONED, CTLR VERIFIES BOTH ACFT ARE AT THEIR ASSIGNED, VERTLY SEPARATED ALT.

Narrative: FA20 CHKED ON DSNDING TO FL240. B737 WAS LEVEL AT FL230. CONFLICT ALERT WENT OFF AND FA20 MODE C INDICATED FL230. WHEN ASKED ASSIGNED ALT, HE RPTED LEVEL FL240.

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.