B737-300 crew executed a TCASII maneuver with an unidented aircraft in jax class east airspace.

Attributes
ACN	566569
Time
Date	200211
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : jax.airport
State Reference	FL
Altitude	msl single value : 5500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : jax.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 8200 flight time type : 5600
ASRS Report	566569
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 3900 flight time type : 900
ASRS Report	566570
Events
Anomaly	conflict : airborne critical aircraft equipment problem : critical
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew other
Miss Distance	horizontal : 12000 vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

While being vectored by jax approach for runway 7 at jax, we were instructed to descend to 4000 ft. At approximately 10-15 NM nnw of the airport as we passed 5800 ft, we got a TA at 11 O'clock position, 3 NM, at an altitude of 5500 ft MSL. This was the first contact on TCASII. We slowed the descent rate and at 2 NM got an RA commanding a climb. The first officer (PF) climbed as directed. We acquired the aircraft visually a moment later at 5500 ft on a converging heading. Our evasive climb caused drink trays to be upset in the cabin, but did not cause any injuries. ATC was informed of our TCASII climb. The other aircraft passed below us at 5500 ft and continued on course. We passed approximately 800 ft overhead the other aircraft.

Original NASA ASRS Text

Title: B737-300 CREW EXECUTED A TCASII MANEUVER WITH AN UNIDENTED ACFT IN JAX CLASS E AIRSPACE.

Narrative: WHILE BEING VECTORED BY JAX APCH FOR RWY 7 AT JAX, WE WERE INSTRUCTED TO DSND TO 4000 FT. AT APPROX 10-15 NM NNW OF THE ARPT AS WE PASSED 5800 FT, WE GOT A TA AT 11 O'CLOCK POS, 3 NM, AT AN ALT OF 5500 FT MSL. THIS WAS THE FIRST CONTACT ON TCASII. WE SLOWED THE DSCNT RATE AND AT 2 NM GOT AN RA COMMANDING A CLB. THE FO (PF) CLBED AS DIRECTED. WE ACQUIRED THE ACFT VISUALLY A MOMENT LATER AT 5500 FT ON A CONVERGING HDG. OUR EVASIVE CLB CAUSED DRINK TRAYS TO BE UPSET IN THE CABIN, BUT DID NOT CAUSE ANY INJURIES. ATC WAS INFORMED OF OUR TCASII CLB. THE OTHER ACFT PASSED BELOW US AT 5500 FT AND CONTINUED ON COURSE. WE PASSED APPROX 800 FT OVERHEAD THE OTHER ACFT.

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.