<< >> NASA ASRS Report 535895, January 2002

While being controled by an atl approach controller, an LJ45 receives a TCASII alert and climbs to 5500 ft and conflicts with an HS25 on converging course at 6000 ft.

Attributes
ACN	535895
Time
Date	200201
Day	Tue
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	HS 125 Series 1-600
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : atl.tower
Operator	general aviation : personal
Make Model Name	Learjet 45
Flight Phase	descent : approach
Person 1
Function	controller : approach
Experience	controller radar : 27
ASRS Report	535895
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera other flight crewa other flight crewb other other : 4
Resolutory Action	flight crew : took evasive action none taken : anomaly accepted
Consequence	faa : investigated
Miss Distance	vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

The LR45 was level 5000 ft eastbound. The HS25 was level 6000 ft sbound. The LR45 climbed to 5500 ft due to his TCASII indication. The HS25 advised he had the LR45 in sight.

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Original NASA ASRS Text

Title: WHILE BEING CTLED BY AN ATL APCH CTLR, AN LJ45 RECEIVES A TCASII ALERT AND CLBS TO 5500 FT AND CONFLICTS WITH AN HS25 ON CONVERGING COURSE AT 6000 FT.

Narrative: THE LR45 WAS LEVEL 5000 FT EBOUND. THE HS25 WAS LEVEL 6000 FT SBOUND. THE LR45 CLBED TO 5500 FT DUE TO HIS TCASII INDICATION. THE HS25 ADVISED HE HAD THE LR45 IN SIGHT.

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.