<< >> NASA ASRS Report 605788, December 2003

A B737 flight crew has an near midair collision and has to take evasive action to follow TCASII commands and to avoid a midair with a cessna.

Attributes
ACN	605788
Time
Date	200312
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27l other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : a80.tracon
Operator	general aviation : personal
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 2000 flight time type : 56
ASRS Report	605788
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

On final approach ILS runway 27L at 3500 ft MSL at anval fix heading 270 degrees, a localizer course, a white high wing aircraft heading 360 degrees nearly collided with us. He was heading north and we were coming from his right to left. He was climbing into us and we were level. We got, at short range, a TA at our 10 O'clock position and 2-3 NM which quickly became an RA. I disconnected the autoplt and initiated a climb to 4100 ft, cleared the conflict, and descended to 3500 ft MSL. We passed to within 400 ft vertically and 0 ft horizontally.

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Original NASA ASRS Text

Title: A B737 FLT CREW HAS AN NMAC AND HAS TO TAKE EVASIVE ACTION TO FOLLOW TCASII COMMANDS AND TO AVOID A MIDAIR WITH A CESSNA.

Narrative: ON FINAL APCH ILS RWY 27L AT 3500 FT MSL AT ANVAL FIX HDG 270 DEGS, A LOC COURSE, A WHITE HIGH WING ACFT HDG 360 DEGS NEARLY COLLIDED WITH US. HE WAS HDG N AND WE WERE COMING FROM HIS R TO L. HE WAS CLBING INTO US AND WE WERE LEVEL. WE GOT, AT SHORT RANGE, A TA AT OUR 10 O'CLOCK POS AND 2-3 NM WHICH QUICKLY BECAME AN RA. I DISCONNECTED THE AUTOPLT AND INITIATED A CLB TO 4100 FT, CLRED THE CONFLICT, AND DSNDED TO 3500 FT MSL. WE PASSED TO WITHIN 400 FT VERTLY AND 0 FT HORIZLY.

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.