Air carrier X non adherence to ATC clearance made early turn. Pilot deviation.

Attributes
ACN	222943
Time
Date	199210
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : eug
State Reference	OK
Altitude	msl bound lower : 2400 msl bound upper : 2400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : eug tower : pit
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller non radar : 15 controller radar : 1
ASRS Report	222943
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X departed runway 16 runway heading. I instructed air carrier X to proceed direct rbg out of 5000 ft for noise abatement. I saw traffic 6-8 mi ahead of air carrier X, same direction, at 2800 ft. I knew air carrier X would 'top' the traffic since it was level and they were climbing, and normally would not issue this traffic. I did issue the traffic, however, because air carrier X was TCASII equipped, I knew they would see the traffic on TCASII and felt obligated to issue it because of that. Air carrier X advised he was turning to rbg early because of the traffic. I didn't have any traffic for him so I didn't say anything about his turn or stop him. Air carrier X passed abeam the traffic more than 1000 ft higher than the traffic. It is my understanding that aircraft are not to initiate turns because of a TCASII alert, that maneuvering is limited to climb/descend.

Original NASA ASRS Text

Title: ACR X NON ADHERENCE TO ATC CLRNC MADE EARLY TURN. PLTDEV.

Narrative: ACR X DEPARTED RWY 16 RWY HDG. I INSTRUCTED ACR X TO PROCEED DIRECT RBG OUT OF 5000 FT FOR NOISE ABATEMENT. I SAW TFC 6-8 MI AHEAD OF ACR X, SAME DIRECTION, AT 2800 FT. I KNEW ACR X WOULD 'TOP' THE TFC SINCE IT WAS LEVEL AND THEY WERE CLBING, AND NORMALLY WOULD NOT ISSUE THIS TFC. I DID ISSUE THE TFC, HOWEVER, BECAUSE ACR X WAS TCASII EQUIPPED, I KNEW THEY WOULD SEE THE TFC ON TCASII AND FELT OBLIGATED TO ISSUE IT BECAUSE OF THAT. ACR X ADVISED HE WAS TURNING TO RBG EARLY BECAUSE OF THE TFC. I DIDN'T HAVE ANY TFC FOR HIM SO I DIDN'T SAY ANYTHING ABOUT HIS TURN OR STOP HIM. ACR X PASSED ABEAM THE TFC MORE THAN 1000 FT HIGHER THAN THE TFC. IT IS MY UNDERSTANDING THAT ACFT ARE NOT TO INITIATE TURNS BECAUSE OF A TCASII ALERT, THAT MANEUVERING IS LIMITED TO CLB/DSND.

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.