Narrative:

I was on practice ILS approach to runway 27R at sfb under clear sky and good visibility. Orl approach issued a missed approach to climb runway heading 2000 ft, and return to the approach frequency. Shortly after, I was instructed to contact tower. Sfb tower instructed a jet to 'position and hold' on runway 27R, and instructed me to execute a missed approach 1 mi from the threshold with a 'right 360.' since the terminology was '360' vice '3-6-0,' the term 'heading' was not used, and no altitude was stated, I interpreted the instruction to be a right 360 for spacing behind the departing jet. I complied at 1 mi, reported the missed, and commenced a climbing right turn. Only after the handoff back to departure did I determine that sfb tower had actually issued an amended missed approach instruction. By this time, I was more than 90 degrees right of ATC's intended heading of 3-6-0, and still turning right. My aircraft conflict with other aircraft was caused by sfb tower's failure to adhere to proper aim section 4-2-10 terminology of discrete numbers for heading instructions. For this particular heading, the slang '360' is equivalent to the common term for a normal spacing maneuver often issued by tower to aircraft in the traffic pattern. Speaking the discrete characters '3-6-0' or using the word 'heading' in the instruction would have removed all doubt and could have averted a potential traffic conflict.

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Original NASA ASRS Text

Title: PL2 PLT HAD A TRACK DEV IN SFB CLASS D AND CONFLICT DEPARTING TFC.

Narrative: I WAS ON PRACTICE ILS APCH TO RWY 27R AT SFB UNDER CLR SKY AND GOOD VISIBILITY. ORL APCH ISSUED A MISSED APCH TO CLB RWY HDG 2000 FT, AND RETURN TO THE APCH FREQ. SHORTLY AFTER, I WAS INSTRUCTED TO CONTACT TWR. SFB TWR INSTRUCTED A JET TO 'POS AND HOLD' ON RWY 27R, AND INSTRUCTED ME TO EXECUTE A MISSED APCH 1 MI FROM THE THRESHOLD WITH A 'RIGHT 360.' SINCE THE TERMINOLOGY WAS '360' VICE '3-6-0,' THE TERM 'HDG' WAS NOT USED, AND NO ALT WAS STATED, I INTERPED THE INSTRUCTION TO BE A R 360 FOR SPACING BEHIND THE DEPARTING JET. I COMPLIED AT 1 MI, RPTED THE MISSED, AND COMMENCED A CLBING R TURN. ONLY AFTER THE HDOF BACK TO DEP DID I DETERMINE THAT SFB TWR HAD ACTUALLY ISSUED AN AMENDED MISSED APCH INSTRUCTION. BY THIS TIME, I WAS MORE THAN 90 DEGS R OF ATC'S INTENDED HDG OF 3-6-0, AND STILL TURNING R. MY ACFT CONFLICT WITH OTHER ACFT WAS CAUSED BY SFB TWR'S FAILURE TO ADHERE TO PROPER AIM SECTION 4-2-10 TERMINOLOGY OF DISCRETE NUMBERS FOR HDG INSTRUCTIONS. FOR THIS PARTICULAR HDG, THE SLANG '360' IS EQUIVALENT TO THE COMMON TERM FOR A NORMAL SPACING MANEUVER OFTEN ISSUED BY TWR TO ACFT IN THE TFC PATTERN. SPEAKING THE DISCRETE CHARACTERS '3-6-0' OR USING THE WORD 'HDG' IN THE INSTRUCTION WOULD HAVE REMOVED ALL DOUBT AND COULD HAVE AVERTED A POTENTIAL TFC CONFLICT.

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.