<< >> NASA ASRS Report 428268, February 1999

Aircraft Y was not given speed reduction and subsequently overtook aircraft X. Reporter tried to separate aircraft, but too late, separation was lost.

Attributes
ACN	428268
Time
Date	199902
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : atl.vortac
State Reference	GA
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl.tracon
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : atl.tracon
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 18 controller time certified in position1 : 9
ASRS Report	428268
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 2000
ASRS Report	428562
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated faa : reviewed incident with flight crew
Miss Distance	horizontal : 2500 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Lead aircraft X on downwind was slowed to 180 KTS by previous controller. Trailing aircraft Y was at 250 KTS. Both descending to 7000 ft on downwind leg. Conflict alert went off. I then descended leading aircraft X and turned trailing aircraft Y to a 30 degree diverging heading.

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Original NASA ASRS Text

Title: ACFT Y WAS NOT GIVEN SPD REDUCTION AND SUBSEQUENTLY OVERTOOK ACFT X. RPTR TRIED TO SEPARATE ACFT, BUT TOO LATE, SEPARATION WAS LOST.

Narrative: LEAD ACFT X ON DOWNWIND WAS SLOWED TO 180 KTS BY PREVIOUS CTLR. TRAILING ACFT Y WAS AT 250 KTS. BOTH DSNDING TO 7000 FT ON DOWNWIND LEG. CONFLICT ALERT WENT OFF. I THEN DSNDED LEADING ACFT X AND TURNED TRAILING ACFT Y TO A 30 DEG DIVERGING HDG.

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.