Aircraft equipment TCASII gave air carrier X TCASII RA from VFR fgt in air traffic area. See and avo...

Attributes
ACN	235612
Time
Date	199303
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fsd
State Reference	SD
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : fsd
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	other other
Flight Plan	None
Person 1
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 10 controller supervisory : 5
ASRS Report	235612
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Air carrier X was large transport with TCASII on final approach, 4 mi from end of runway. Other aircraft was fgt in VFR traffic pattern to runway 21, descending from high key on a simulated flameout approach. Fgt pilot was asked if he could turn in front of the air carrier X for a low approach. Fgt pilot accepted turn and rolled out 1 mi in front of air carrier X and completed low approach. Air carrier X pilot called me on telephone and was very irate about sequencing fgt in front of his flight. He indicated that the TCASII on his aircraft was indicating an RA of an immediate climb because fgt was seen as a threat. Use of the TCASII in a VFR traffic pattern with high speed, very maneuverable aircraft will result in TCASII TA's and RA's that are incorrect and could be very disruptive to VFR traffic pattern. Not all aircraft in a traffic pattern will have their xponders turned on and TA's and RA's will not be accurate. A busy VFR traffic pattern is not the place for TCASII. Eyeballs connected to pilots and controllers making decisions will result in the most efficient and safe use of congested airspace!

Original NASA ASRS Text

Title: ACFT EQUIP TCASII GAVE ACR X TCASII RA FROM VFR FGT IN ATA. SEE AND AVOID CONCEPT.

Narrative: ACR X WAS LGT WITH TCASII ON FINAL APCH, 4 MI FROM END OF RWY. OTHER ACFT WAS FGT IN VFR TFC PATTERN TO RWY 21, DSNDING FROM HIGH KEY ON A SIMULATED FLAMEOUT APCH. FGT PLT WAS ASKED IF HE COULD TURN IN FRONT OF THE ACR X FOR A LOW APCH. FGT PLT ACCEPTED TURN AND ROLLED OUT 1 MI IN FRONT OF ACR X AND COMPLETED LOW APCH. ACR X PLT CALLED ME ON TELEPHONE AND WAS VERY IRATE ABOUT SEQUENCING FGT IN FRONT OF HIS FLT. HE INDICATED THAT THE TCASII ON HIS ACFT WAS INDICATING AN RA OF AN IMMEDIATE CLB BECAUSE FGT WAS SEEN AS A THREAT. USE OF THE TCASII IN A VFR TFC PATTERN WITH HIGH SPD, VERY MANEUVERABLE ACFT WILL RESULT IN TCASII TA'S AND RA'S THAT ARE INCORRECT AND COULD BE VERY DISRUPTIVE TO VFR TFC PATTERN. NOT ALL ACFT IN A TFC PATTERN WILL HAVE THEIR XPONDERS TURNED ON AND TA'S AND RA'S WILL NOT BE ACCURATE. A BUSY VFR TFC PATTERN IS NOT THE PLACE FOR TCASII. EYEBALLS CONNECTED TO PLTS AND CTLRS MAKING DECISIONS WILL RESULT IN THE MOST EFFICIENT AND SAFE USE OF CONGESTED AIRSPACE!

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.

Aircraft equipment TCASII gave air carrier X TCASII RA from VFR fgt in air traffic area. See and avoid concept.