Multiple runway operation parallel runways air carrier X TCASII RA had less than standard separation from air carrier Y. System error.

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Attributes
ACN	268159
Time
Date	199404
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 500
ASRS Report	268159
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X being vectored for runway 9L. We were on an assigned heading of 180 degrees. I, the first officer, was flying. The captain was working the radio. The TCASII gave a command to descend. At that time I noticed traffic at 12 O'clock. I immediately followed the TCASII RA and started a descent. Also, banked left and started turning toward the airport. The traffic I was avoiding was air carrier Y on a right base leg for runway 9R mia. After losing about 500 ft in the descent, mia approach cleared us for a left turn visual approach runway 9L. I leveled off about 2000 ft heading for runway 9L now in sight and waited to join the GS and localizer and landed normally. Nothing that I know of was said by other aircraft or controller. I think the controller was very busy at that time with all the traffic and somehow the instruction may have gotten confused. I am thankful we had the TCASII working. The other traffic should also have gotten a warning equal to ours but I didn't notice any action on his part. Do some crews turn them off in air traffic area? If so, I think a bad idea.

Original NASA ASRS Text

Title: MULTIPLE RWY OP PARALLEL RWYS ACR X TCASII RA HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: ACR X BEING VECTORED FOR RWY 9L. WE WERE ON AN ASSIGNED HDG OF 180 DEGS. I, THE FO, WAS FLYING. THE CAPT WAS WORKING THE RADIO. THE TCASII GAVE A COMMAND TO DSND. AT THAT TIME I NOTICED TFC AT 12 O'CLOCK. I IMMEDIATELY FOLLOWED THE TCASII RA AND STARTED A DSCNT. ALSO, BANKED L AND STARTED TURNING TOWARD THE ARPT. THE TFC I WAS AVOIDING WAS ACR Y ON A R BASE LEG FOR RWY 9R MIA. AFTER LOSING ABOUT 500 FT IN THE DSCNT, MIA APCH CLRED US FOR A L TURN VISUAL APCH RWY 9L. I LEVELED OFF ABOUT 2000 FT HDG FOR RWY 9L NOW IN SIGHT AND WAITED TO JOIN THE GS AND LOC AND LANDED NORMALLY. NOTHING THAT I KNOW OF WAS SAID BY OTHER ACFT OR CTLR. I THINK THE CTLR WAS VERY BUSY AT THAT TIME WITH ALL THE TFC AND SOMEHOW THE INSTRUCTION MAY HAVE GOTTEN CONFUSED. I AM THANKFUL WE HAD THE TCASII WORKING. THE OTHER TFC SHOULD ALSO HAVE GOTTEN A WARNING EQUAL TO OURS BUT I DIDN'T NOTICE ANY ACTION ON HIS PART. DO SOME CREWS TURN THEM OFF IN ATA? IF SO, I THINK A BAD IDEA.

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.