Airborne conflict between the reporter in air carrier mdt descending to land at an airport in class B airspace and 2 other unknown aircraft descending to go into an uncontrolled airport outside of class B airspace. The first encounter was not visually observed but produced a TCASII RA as an near midair collision, and not under ATC control. The second was controled and was visually observed as it went by. Reporter took evasive action by first climbing and then descending.

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Attributes
ACN	361698
Time
Date	199702
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mem
State Reference	TN
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mem
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 9000 flight time type : 1000
ASRS Report	361698
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

While being cleared for a visual approach to mem we had just been given a frequency change to tower. Prior to checking in, we received a TCASII TA, followed by an RA to 'climb.' while climbing, we received a second RA to 'descend, descend now.' after traffic passed, we landed at mem. The first TA showed an altitude of 2300 ft and we estimate an approximately vertical separation of 300-500 ft. The second RA we actually saw the aircraft on the pushover pass overhead and off to the right at approximately 500 ft vertical separation. ATC was advised and contacted on the phone after landing. The ATC supervisor had started looking into the situation. The first RA was with an aircraft that was VFR and not being worked by ATC and was just outside the class B airspace and was going to an uncontrolled airport. The second RA/conflict was with an aircraft that was being worked by ATC and was making a visual descent into the same airport that the first aircraft was going to. ATC stated he had us in sight and was maintaining a visual clearance. The problem with this incident is that with only vertical guidance for the resolution it causes the second resolution.

Original NASA ASRS Text

Title: AIRBORNE CONFLICT BTWN THE RPTR IN ACR MDT DSNDING TO LAND AT AN ARPT IN CLASS B AIRSPACE AND 2 OTHER UNKNOWN ACFT DSNDING TO GO INTO AN UNCTLED ARPT OUTSIDE OF CLASS B AIRSPACE. THE FIRST ENCOUNTER WAS NOT VISUALLY OBSERVED BUT PRODUCED A TCASII RA AS AN NMAC, AND NOT UNDER ATC CTL. THE SECOND WAS CTLED AND WAS VISUALLY OBSERVED AS IT WENT BY. RPTR TOOK EVASIVE ACTION BY FIRST CLBING AND THEN DSNDING.

Narrative: WHILE BEING CLRED FOR A VISUAL APCH TO MEM WE HAD JUST BEEN GIVEN A FREQ CHANGE TO TWR. PRIOR TO CHKING IN, WE RECEIVED A TCASII TA, FOLLOWED BY AN RA TO 'CLB.' WHILE CLBING, WE RECEIVED A SECOND RA TO 'DSND, DSND NOW.' AFTER TFC PASSED, WE LANDED AT MEM. THE FIRST TA SHOWED AN ALT OF 2300 FT AND WE ESTIMATE AN APPROX VERT SEPARATION OF 300-500 FT. THE SECOND RA WE ACTUALLY SAW THE ACFT ON THE PUSHOVER PASS OVERHEAD AND OFF TO THE R AT APPROX 500 FT VERT SEPARATION. ATC WAS ADVISED AND CONTACTED ON THE PHONE AFTER LNDG. THE ATC SUPVR HAD STARTED LOOKING INTO THE SIT. THE FIRST RA WAS WITH AN ACFT THAT WAS VFR AND NOT BEING WORKED BY ATC AND WAS JUST OUTSIDE THE CLASS B AIRSPACE AND WAS GOING TO AN UNCTLED ARPT. THE SECOND RA/CONFLICT WAS WITH AN ACFT THAT WAS BEING WORKED BY ATC AND WAS MAKING A VISUAL DSCNT INTO THE SAME ARPT THAT THE FIRST ACFT WAS GOING TO. ATC STATED HE HAD US IN SIGHT AND WAS MAINTAINING A VISUAL CLRNC. THE PROB WITH THIS INCIDENT IS THAT WITH ONLY VERT GUIDANCE FOR THE RESOLUTION IT CAUSES THE SECOND RESOLUTION.

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.