<< >> NASA ASRS Report 381594, August 1997

B757 in the class B of atl has an near midair collision with a crossing small aircraft at the same altitude of 3500 ft. Both approach controller and TCASII announce the traffic and advise a climb for avoidance.

Attributes
ACN	381594
Time
Date	199708
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Viking
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 16000 flight time type : 2000
ASRS Report	381594
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac inflight encounter : vfr in imc non adherence : far other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

While on extended downwind for landing atl runway 27L at 3500 ft MSL, approach control advised traffic 11 O'clock and 4 mi. Visibility was poor. I reported 'no contact.' TCASII called 'traffic' and the altitude readout was the same as ours. Approach control called traffic at 11 O'clock and 1 mi and cleared us to climb. At the same time TCASII sounded 'climb, climb,' which we did. I observed an aircraft much like a bellanca viking pass closely beneath us (about 300 ft). We returned to our assigned altitude shortly. Approach control advised that we were in class B airspace but at its floor. I recommend that approach control vector IFR aircraft at altitudes at least a wing span above uncontrolled airspace.

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Original NASA ASRS Text

Title: B757 IN THE CLASS B OF ATL HAS AN NMAC WITH A XING SMA AT THE SAME ALT OF 3500 FT. BOTH APCH CTLR AND TCASII ANNOUNCE THE TFC AND ADVISE A CLB FOR AVOIDANCE.

Narrative: WHILE ON EXTENDED DOWNWIND FOR LNDG ATL RWY 27L AT 3500 FT MSL, APCH CTL ADVISED TFC 11 O'CLOCK AND 4 MI. VISIBILITY WAS POOR. I RPTED 'NO CONTACT.' TCASII CALLED 'TFC' AND THE ALT READOUT WAS THE SAME AS OURS. APCH CTL CALLED TFC AT 11 O'CLOCK AND 1 MI AND CLRED US TO CLB. AT THE SAME TIME TCASII SOUNDED 'CLB, CLB,' WHICH WE DID. I OBSERVED AN ACFT MUCH LIKE A BELLANCA VIKING PASS CLOSELY BENEATH US (ABOUT 300 FT). WE RETURNED TO OUR ASSIGNED ALT SHORTLY. APCH CTL ADVISED THAT WE WERE IN CLASS B AIRSPACE BUT AT ITS FLOOR. I RECOMMEND THAT APCH CTL VECTOR IFR ACFT AT ALTS AT LEAST A WING SPAN ABOVE UNCTLED AIRSPACE.

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.