Light transport air carrier makes a go around after receiving a TCASII RA on final approach.

Attributes
ACN	274041
Time
Date	199406
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : myr
State Reference	SC
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : myr tower : jfk
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach landing : go around
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 6000 flight time type : 1500
ASRS Report	274041
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 4500 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On final at myr, got TA on TCASII descending through 1200 ft MSL. Traffic was 200 ft below us, then 100 ft. We initiated go around, told tower. They had us do visual pattern back to land and said it may have been a boat on intracoastal waterway, but I've personally never seen a boat at 1000 ft. As soon as we were established on downwind leg after the go around there was a cessna on short final. Apparently he was #2 to land at myr and the controllers never realized he was immediately below us on final (according to TCASII about 3/4 mi to the right and 100 ft below us). Since we could not see the aircraft, the go around was initiated and the TCASII possibly saved us again. I called the myr approach controller after landing and explained what had happened.

Original NASA ASRS Text

Title: LTT ACR MAKES A GAR AFTER RECEIVING A TCASII RA ON FINAL APCH.

Narrative: ON FINAL AT MYR, GOT TA ON TCASII DSNDING THROUGH 1200 FT MSL. TFC WAS 200 FT BELOW US, THEN 100 FT. WE INITIATED GAR, TOLD TWR. THEY HAD US DO VISUAL PATTERN BACK TO LAND AND SAID IT MAY HAVE BEEN A BOAT ON INTRACOASTAL WATERWAY, BUT I'VE PERSONALLY NEVER SEEN A BOAT AT 1000 FT. AS SOON AS WE WERE ESTABLISHED ON DOWNWIND LEG AFTER THE GAR THERE WAS A CESSNA ON SHORT FINAL. APPARENTLY HE WAS #2 TO LAND AT MYR AND THE CTLRS NEVER REALIZED HE WAS IMMEDIATELY BELOW US ON FINAL (ACCORDING TO TCASII ABOUT 3/4 MI TO THE R AND 100 FT BELOW US). SINCE WE COULD NOT SEE THE ACFT, THE GAR WAS INITIATED AND THE TCASII POSSIBLY SAVED US AGAIN. I CALLED THE MYR APCH CTLR AFTER LNDG AND EXPLAINED WHAT HAD HAPPENED.

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.