Air carrier X non adherence to ATC clearance. Climb from assigned altitude. Pilot deviation. Recurrent event TCASII causes excursion from assigned altitude.

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Attributes
ACN	175766
Time
Date	199104
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5300
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 9
ASRS Report	175766
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Simultaneous ILS approachs in use. Air carrier X is intercepting the final. He reports that he is climbing. I asked why. He stated he had a TCAS alert and must react to it. The only other traffic near him was on runway 14L at 4000'. This procedure is protected by turn-ONS at different altitudes. If I am vectoring at 4000' and he climbs, we lost sep with traffic on other ILS. If he descended, he leaves my airspace where departures come off palwaukee climbing to 3000'.

Original NASA ASRS Text

Title: ACR X NON ADHERENCE TO ATC CLRNC. CLIMB FROM ASSIGNED ALT. PLT DEVIATION. RECURRENT EVENT TCASII CAUSES EXCURSION FROM ASSIGNED ALT.

Narrative: SIMULTANEOUS ILS APCHS IN USE. ACR X IS INTERCEPTING THE FINAL. HE RPTS THAT HE IS CLBING. I ASKED WHY. HE STATED HE HAD A TCAS ALERT AND MUST REACT TO IT. THE ONLY OTHER TFC NEAR HIM WAS ON RWY 14L AT 4000'. THIS PROC IS PROTECTED BY TURN-ONS AT DIFFERENT ALTS. IF I AM VECTORING AT 4000' AND HE CLBS, WE LOST SEP WITH TFC ON OTHER ILS. IF HE DSNDED, HE LEAVES MY AIRSPACE WHERE DEPS COME OFF PALWAUKEE CLBING TO 3000'.

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.