<< >> NASA ASRS Report 448713, September 1999

2 ZFW controllers involved in an operational error when neither controller recognized an incorrect readback, which resulted in 1 aircraft descended into the flight path of another.

Attributes
ACN	448713
Time
Date	199909
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : jen.vortac
State Reference	TX
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute other
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change cruise : descent
Route In Use	enroute other
Flight Plan	IFR
Person 1
Function	controller : radar
Experience	controller radar : 9
ASRS Report	448713
Person 2
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Experience	controller radar : 7 controller time certified in position1 : 0.75
ASRS Report	448712
Events
Anomaly	non adherence : required legal separation non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	atc equipment : conflict alert other controllera other controllerb
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 19500 vertical : 800
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X assigned 070. Air carrier Y read back the clearance resulting in a loss of separation with air carrier X.

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Original NASA ASRS Text

Title: 2 ZFW CTLRS INVOLVED IN AN OPERROR WHEN NEITHER CTLR RECOGNIZED AN INCORRECT READBACK, WHICH RESULTED IN 1 ACFT DSNDED INTO THE FLT PATH OF ANOTHER.

Narrative: ACR X ASSIGNED 070. ACR Y READ BACK THE CLRNC RESULTING IN A LOSS OF SEPARATION WITH 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.