An air carrier DC9 on visual approach to runway 25L was given traffic information and sighted a C310 on right base for runway 25R. The DC9 received a TCASII RA on the C310 and executed a go around. Company management refused ATC request that their aircraft operate in the TA mode when near the airport.

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Attributes
ACN	381898
Time
Date	199709
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mke
State Reference	WI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mke tower : hel
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 15
ASRS Report	381898
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

The twin cessna was on a right base for runway 25R, aware of the DC9 on final for runway 25L. The twin cessna had the DC9 in sight. The DC9 on final for runway 25L was aware of the twin cessna for runway 25R, and had the twin cessna in sight, got an RA from TCASII, and went around. The pilot informed us that RA's must, in all circumstances, be adhered to. Company confirmed this, and when queried as to whether they might consider changing their policy and operating in the TA mode in the airport environment, responded that they would prefer to have their pilots operate in the RA mode, and trust the RA over what they observe with their own eyes. Throughout this entire scenario, I had both aircraft in sight and informed both aircraft of this. I feel the TCASII should not be used in RA mode in the vicinity of the airport. Also, I feel that strict adherence to RA's is a questionable policy when pilots see the traffic and are informed as to the details of the situation and don't feel they are in jeopardy.

Original NASA ASRS Text

Title: AN ACR DC9 ON VISUAL APCH TO RWY 25L WAS GIVEN TFC INFO AND SIGHTED A C310 ON R BASE FOR RWY 25R. THE DC9 RECEIVED A TCASII RA ON THE C310 AND EXECUTED A GAR. COMPANY MGMNT REFUSED ATC REQUEST THAT THEIR ACFT OPERATE IN THE TA MODE WHEN NEAR THE ARPT.

Narrative: THE TWIN CESSNA WAS ON A R BASE FOR RWY 25R, AWARE OF THE DC9 ON FINAL FOR RWY 25L. THE TWIN CESSNA HAD THE DC9 IN SIGHT. THE DC9 ON FINAL FOR RWY 25L WAS AWARE OF THE TWIN CESSNA FOR RWY 25R, AND HAD THE TWIN CESSNA IN SIGHT, GOT AN RA FROM TCASII, AND WENT AROUND. THE PLT INFORMED US THAT RA'S MUST, IN ALL CIRCUMSTANCES, BE ADHERED TO. COMPANY CONFIRMED THIS, AND WHEN QUERIED AS TO WHETHER THEY MIGHT CONSIDER CHANGING THEIR POLICY AND OPERATING IN THE TA MODE IN THE ARPT ENVIRONMENT, RESPONDED THAT THEY WOULD PREFER TO HAVE THEIR PLTS OPERATE IN THE RA MODE, AND TRUST THE RA OVER WHAT THEY OBSERVE WITH THEIR OWN EYES. THROUGHOUT THIS ENTIRE SCENARIO, I HAD BOTH ACFT IN SIGHT AND INFORMED BOTH ACFT OF THIS. I FEEL THE TCASII SHOULD NOT BE USED IN RA MODE IN THE VICINITY OF THE ARPT. ALSO, I FEEL THAT STRICT ADHERENCE TO RA'S IS A QUESTIONABLE POLICY WHEN PLTS SEE THE TFC AND ARE INFORMED AS TO THE DETAILS OF THE SIT AND DON'T FEEL THEY ARE IN JEOPARDY.

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.