During turn-in to a parallel ILS approach, captain of an medium large transport air carrier aircraft drifted over to the other runway centerline in response to a TCASII RA.

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Attributes
ACN	251125
Time
Date	199309
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 4000 msl bound upper : 4500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 15000
ASRS Report	235112
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 11500 flight time type : 9500
ASRS Report	251043
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 750 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared to intercept the 30R localizer at 4500 ft assigned. We were approximately 20 mi out at this time in the right turn when we received a TCASII RA. We followed the direction (descend) to approximately 4000 ft then climbed back to 4500 ft as we told ATC of the problem. We were in a cloud deck of broken between approximately 4000 ft and 6000 ft. I did not see the subject aircraft. What bothers me the most is that the resulting avoidance maneuver was not well executed. Although the altitude did not vary that much, we did not stay in the green band and in the confusion we passed through the localizer on a parallel runway system. The RA could hardly have happened at a worse place, turning, intercepting, WX, low altitude, changing confign, and speed. I was startled by the RA and feel simulator exposure to this system is a must. Hopefully, next time I'll feel better about the experience!

Original NASA ASRS Text

Title: DURING TURN-IN TO A PARALLEL ILS APCH, CAPT OF AN MLG ACR ACFT DRIFTED OVER TO THE OTHER RWY CTRLINE IN RESPONSE TO A TCASII RA.

Narrative: WE WERE CLRED TO INTERCEPT THE 30R LOC AT 4500 FT ASSIGNED. WE WERE APPROX 20 MI OUT AT THIS TIME IN THE R TURN WHEN WE RECEIVED A TCASII RA. WE FOLLOWED THE DIRECTION (DSND) TO APPROX 4000 FT THEN CLBED BACK TO 4500 FT AS WE TOLD ATC OF THE PROB. WE WERE IN A CLOUD DECK OF BROKEN BTWN APPROX 4000 FT AND 6000 FT. I DID NOT SEE THE SUBJECT ACFT. WHAT BOTHERS ME THE MOST IS THAT THE RESULTING AVOIDANCE MANEUVER WAS NOT WELL EXECUTED. ALTHOUGH THE ALT DID NOT VARY THAT MUCH, WE DID NOT STAY IN THE GREEN BAND AND IN THE CONFUSION WE PASSED THROUGH THE LOC ON A PARALLEL RWY SYS. THE RA COULD HARDLY HAVE HAPPENED AT A WORSE PLACE, TURNING, INTERCEPTING, WX, LOW ALT, CHANGING CONFIGN, AND SPD. I WAS STARTLED BY THE RA AND FEEL SIMULATOR EXPOSURE TO THIS SYS IS A MUST. HOPEFULLY, NEXT TIME I'LL FEEL BETTER ABOUT THE EXPERIENCE!

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.