Potential conflict with T-34 in proximity of approach route on ILS course during a visual approach.

Attributes
ACN	268619
Time
Date	199404
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : aus
State Reference	TX
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : aus tower : hpn
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Mentor (T-34)
Operating Under FAR Part	other : other
Flight Phase	cruise other cruise other
Route In Use	enroute : direct
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : atp pilot : instrument
Experience	flight time last 90 days : 155 flight time total : 90000 flight time type : 1410
ASRS Report	268619
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Aircraft on downwind began right base for visual landing 31L austin. Turning final, switched to tower frequency. Tower cleared us to land and advised traffic at 10 O'clock. We did not have traffic at that time. When established on final inbound, issue marker at 2500 ft, a navy T-34 flew directly across the localizer at 2000 ft, causing a RA on our TCASII. We remained on final and cleared traffic, but this was not adequate separation. Even though the T-34 had us in sight, I consider it totally unsafe for any aircraft to be flying VFR across the localizer within 3 mi of the runway, especially with another aircraft on final. We only missed by 600 ft vertically and estimated 3000 ft horizontally.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT WITH T-34 IN PROX OF APCH RTE ON ILS COURSE DURING A VISUAL APCH.

Narrative: ACFT ON DOWNWIND BEGAN R BASE FOR VISUAL LNDG 31L AUSTIN. TURNING FINAL, SWITCHED TO TWR FREQ. TWR CLRED US TO LAND AND ADVISED TFC AT 10 O'CLOCK. WE DID NOT HAVE TFC AT THAT TIME. WHEN ESTABLISHED ON FINAL INBOUND, ISSUE MARKER AT 2500 FT, A NAVY T-34 FLEW DIRECTLY ACROSS THE LOC AT 2000 FT, CAUSING A RA ON OUR TCASII. WE REMAINED ON FINAL AND CLRED TFC, BUT THIS WAS NOT ADEQUATE SEPARATION. EVEN THOUGH THE T-34 HAD US IN SIGHT, I CONSIDER IT TOTALLY UNSAFE FOR ANY ACFT TO BE FLYING VFR ACROSS THE LOC WITHIN 3 MI OF THE RWY, ESPECIALLY WITH ANOTHER ACFT ON FINAL. WE ONLY MISSED BY 600 FT VERTICALLY AND ESTIMATED 3000 FT HORIZONTALLY.

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.