Air carrier X TCASII RA descend unauthorized uncoord penetration of airspace non adherence to ATC clearance had less than standard separation from aircraft Y. Aircraft Y evasive action taken.

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Attributes
ACN	238189
Time
Date	199304
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ard
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny tower : lga
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : zny enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 12
ASRS Report	238189
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action other
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was working air carrier X into lga. Air carrier X had a clearance to cross somto intersection at 11000 ft. As air carrier X approached 11000 ft, he advised he had a TCASII resolution and was descending. I advised him the only traffic in his vicinity was below him climbing from 9000 to 10000 ft. He replied that he must abide by the resolution and descended to 9500 ft. Aircraft Y at 10000 ft had to take evasive action. Aircraft Y at 10000 ft was working ZNY. This is the 4TH TCASII incident that I have been involved in, with 2 of the 4 resulting in at least 1 aircraft taking evasive action to avoid the aircraft with the resolution. I do not believe in, nor trust, the TCASII program at this time due to the fact that I have seen it take a normal, safe situation and turn it into a potential disaster. I feel strongly that something must be done about this before a tragedy occurs.

Original NASA ASRS Text

Title: ACR X TCASII RA DSND UNAUTH UNCOORD PENETRATION OF AIRSPACE NON ADHERENCE TO ATC CLRNC HAD LTSS FROM ACFT Y. ACFT Y EVASIVE ACTION TAKEN.

Narrative: I WAS WORKING ACR X INTO LGA. ACR X HAD A CLRNC TO CROSS SOMTO INTXN AT 11000 FT. AS ACR X APCHED 11000 FT, HE ADVISED HE HAD A TCASII RESOLUTION AND WAS DSNDING. I ADVISED HIM THE ONLY TFC IN HIS VICINITY WAS BELOW HIM CLBING FROM 9000 TO 10000 FT. HE REPLIED THAT HE MUST ABIDE BY THE RESOLUTION AND DSNDED TO 9500 FT. ACFT Y AT 10000 FT HAD TO TAKE EVASIVE ACTION. ACFT Y AT 10000 FT WAS WORKING ZNY. THIS IS THE 4TH TCASII INCIDENT THAT I HAVE BEEN INVOLVED IN, WITH 2 OF THE 4 RESULTING IN AT LEAST 1 ACFT TAKING EVASIVE ACTION TO AVOID THE ACFT WITH THE RESOLUTION. I DO NOT BELIEVE IN, NOR TRUST, THE TCASII PROGRAM AT THIS TIME DUE TO THE FACT THAT I HAVE SEEN IT TAKE A NORMAL, SAFE SIT AND TURN IT INTO A POTENTIAL DISASTER. I FEEL STRONGLY THAT SOMETHING MUST BE DONE ABOUT THIS BEFORE A TRAGEDY OCCURS.

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.