Medium large transport takes evasive action when receiving TCASII RA.

Attributes
ACN	273882
Time
Date	199406
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3700
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 15000 flight time type : 4000
ASRS Report	273882
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew faa : investigated
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During the approach phase of an ILS runway 19 at sna we got an RA on our TCASII. We were level at 3000 ft downwind for runway 19. We were given a heading change of 20 degrees to the left by approach control. At the same time, we had a TCASII RA -- we followed the TCASII commands and climbed to 3700 ft. When the RA was over, we descended back to 3000 ft and were cleared for the approach. TRACON claims we violated another IFR airplane's airspace and alarms went off. I was notified of this and informed by TRACON that an investigation would follow.

Original NASA ASRS Text

Title: MLG TAKES EVASIVE ACTION WHEN RECEIVING TCASII RA.

Narrative: DURING THE APCH PHASE OF AN ILS RWY 19 AT SNA WE GOT AN RA ON OUR TCASII. WE WERE LEVEL AT 3000 FT DOWNWIND FOR RWY 19. WE WERE GIVEN A HDG CHANGE OF 20 DEGS TO THE L BY APCH CTL. AT THE SAME TIME, WE HAD A TCASII RA -- WE FOLLOWED THE TCASII COMMANDS AND CLBED TO 3700 FT. WHEN THE RA WAS OVER, WE DSNDED BACK TO 3000 FT AND WERE CLRED FOR THE APCH. TRACON CLAIMS WE VIOLATED ANOTHER IFR AIRPLANE'S AIRSPACE AND ALARMS WENT OFF. I WAS NOTIFIED OF THIS AND INFORMED BY TRACON THAT AN INVESTIGATION WOULD FOLLOW.

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.