<< >> NASA ASRS Report 440743, June 1999

Reporter states that his aircraft X had a close encounter with unknown aircraft Y after takeoff from atl. Aircraft Y was not in contact with ATC.

Attributes
ACN	440743
Time
Date	199906
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : atl.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : multi engine pilot : private pilot : commercial pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 100
ASRS Report	440743
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : atp
Experience	flight time last 90 days : 375 flight time total : 12000 flight time type : 5000
ASRS Report	440740
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 3000 vertical : 200
Supplementary
Problem Areas	Aircraft Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Normal takeoff runway 8R climbing through approximately 3000 ft, just breaking out of the clouds, we received a TCASII TA. TCASII display showed traffic 200 ft below us at 12 O'clock position, only a mile (or less) away. No RA was received. We asked departure control if they had traffic in the area. They said a target had just 'popped up.' they did not know the identify/type aircraft of the target. They tried to establish contact with target, no success. We continued a normal climb and separation increased. No visual contact was ever made. We estimate that target was in the clouds when the TA was received. (ATC said his altitude readout showed 2800 ft when his target appeared on their radar.)

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Original NASA ASRS Text

Title: RPTR STATES THAT HIS ACFT X HAD A CLOSE ENCOUNTER WITH UNKNOWN ACFT Y AFTER TKOF FROM ATL. ACFT Y WAS NOT IN CONTACT WITH ATC.

Narrative: NORMAL TKOF RWY 8R CLBING THROUGH APPROX 3000 FT, JUST BREAKING OUT OF THE CLOUDS, WE RECEIVED A TCASII TA. TCASII DISPLAY SHOWED TFC 200 FT BELOW US AT 12 O'CLOCK POS, ONLY A MILE (OR LESS) AWAY. NO RA WAS RECEIVED. WE ASKED DEP CTL IF THEY HAD TFC IN THE AREA. THEY SAID A TARGET HAD JUST 'POPPED UP.' THEY DID NOT KNOW THE IDENT/TYPE ACFT OF THE TARGET. THEY TRIED TO ESTABLISH CONTACT WITH TARGET, NO SUCCESS. WE CONTINUED A NORMAL CLB AND SEPARATION INCREASED. NO VISUAL CONTACT WAS EVER MADE. WE ESTIMATE THAT TARGET WAS IN THE CLOUDS WHEN THE TA WAS RECEIVED. (ATC SAID HIS ALT READOUT SHOWED 2800 FT WHEN HIS TARGET APPEARED ON THEIR RADAR.)

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.