Air carrier X TCASII TA non adherence to ATC instruction for radar vector around VFR small transport...

Attributes
ACN	247727
Time
Date	199307
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : maf
State Reference	TX
Altitude	msl bound lower : 10500 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : maf
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 5
ASRS Report	247727
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X was assigned heading 295 degrees for roswell, and on an intercept course with small transport Y. This potential conflict had been idented off the runway. I had turned air carrier X on course initially to see what type of climb performance there would be today. With 4 mi and 2500 ft between the 2 aircraft, I issued a 20 degree right turn to air carrier X to pass behind his traffic. The pilot responded that left turn looked good on his TCASII. He delayed taking my instructions until he had the small transport Y in sight. Then he said on frequency that the right turn was better. It has been well documented what controllers think of TCASII RA's. However, this did not even include an RA. The pilot came up with a plan based on an inadequate radar display. This would have put him in closer proximity to small transport Y. I hope that the visual acquisition of his traffic changed the way at least 2 pilots look at their TCASII.

Original NASA ASRS Text

Title: ACR X TCASII TA NON ADHERENCE TO ATC INSTRUCTION FOR RADAR VECTOR AROUND VFR SMT Y.

Narrative: ACR X WAS ASSIGNED HDG 295 DEGS FOR ROSWELL, AND ON AN INTERCEPT COURSE WITH SMT Y. THIS POTENTIAL CONFLICT HAD BEEN IDENTED OFF THE RWY. I HAD TURNED ACR X ON COURSE INITIALLY TO SEE WHAT TYPE OF CLB PERFORMANCE THERE WOULD BE TODAY. WITH 4 MI AND 2500 FT BTWN THE 2 ACFT, I ISSUED A 20 DEG R TURN TO ACR X TO PASS BEHIND HIS TFC. THE PLT RESPONDED THAT L TURN LOOKED GOOD ON HIS TCASII. HE DELAYED TAKING MY INSTRUCTIONS UNTIL HE HAD THE SMT Y IN SIGHT. THEN HE SAID ON FREQ THAT THE R TURN WAS BETTER. IT HAS BEEN WELL DOCUMENTED WHAT CTLRS THINK OF TCASII RA'S. HOWEVER, THIS DID NOT EVEN INCLUDE AN RA. THE PLT CAME UP WITH A PLAN BASED ON AN INADEQUATE RADAR DISPLAY. THIS WOULD HAVE PUT HIM IN CLOSER PROX TO SMT Y. I HOPE THAT THE VISUAL ACQUISITION OF HIS TFC CHANGED THE WAY AT LEAST 2 PLTS LOOK AT THEIR TCASII.

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.

Air carrier X TCASII TA non adherence to ATC instruction for radar vector around VFR small transport Y.