Air carrier X TCASII TA from Y non adherence to ATC clearance left assigned altitude. Pilot deviatio...

Attributes
ACN	252035
Time
Date	199309
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : hvn
State Reference	CT
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : direct
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	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 12500 flight time type : 4800
ASRS Report	252035
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X descending to 6000 ft on deana arrival to hvn. We noticed a target on TCASII level at 6000 ft, on route (magenta line on ehsi) about 10-12 mi. When we leveled at 6000 ft we inquired to ZBW about traffic Y. He turned us over to new york approach. Now the traffic Y was 12 O'clock and approximately 6 mi. We checked in with new york approach and again asked about traffic. He gave us left turn to 090 degrees followed by a more urgent immediate turn to 060 degrees. On autoplt I commanded a 30 degree bank to left turn just as controller issued first turn. We concurrently received a TA from TCASII. I also climbed 200 ft to 6200 ft just in case. While in a turn it is difficult to judge distance from targets on TCASII, but I estimate we came 2-3 mi laterally. After the event we asked the controller for an explanation. He said something about a late handoff and newark arrival traffic.

Original NASA ASRS Text

Title: ACR X TCASII TA FROM Y NON ADHERENCE TO ATC CLRNC LEFT ASSIGNED ALT. PLTDEV.

Narrative: ACR X DSNDING TO 6000 FT ON DEANA ARR TO HVN. WE NOTICED A TARGET ON TCASII LEVEL AT 6000 FT, ON RTE (MAGENTA LINE ON EHSI) ABOUT 10-12 MI. WHEN WE LEVELED AT 6000 FT WE INQUIRED TO ZBW ABOUT TFC Y. HE TURNED US OVER TO NEW YORK APCH. NOW THE TFC Y WAS 12 O'CLOCK AND APPROX 6 MI. WE CHKED IN WITH NEW YORK APCH AND AGAIN ASKED ABOUT TFC. HE GAVE US L TURN TO 090 DEGS FOLLOWED BY A MORE URGENT IMMEDIATE TURN TO 060 DEGS. ON AUTOPLT I COMMANDED A 30 DEG BANK TO L TURN JUST AS CTLR ISSUED FIRST TURN. WE CONCURRENTLY RECEIVED A TA FROM TCASII. I ALSO CLBED 200 FT TO 6200 FT JUST IN CASE. WHILE IN A TURN IT IS DIFFICULT TO JUDGE DISTANCE FROM TARGETS ON TCASII, BUT I ESTIMATE WE CAME 2-3 MI LATERALLY. AFTER THE EVENT WE ASKED THE CTLR FOR AN EXPLANATION. HE SAID SOMETHING ABOUT A LATE HDOF AND NEWARK ARR TFC.

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 from Y non adherence to ATC clearance left assigned altitude. Pilot deviation.