SMA OVERFLIES ACR TAXIING ON RAMP.

Narrative

ON TAXI-IN; LIGHT ACFT LIFTED OFF RWY 19L AND IMMEDIATELY TURNED L ON AN APPROX 45 DEG DEP RIGHT OVER THE RUN-UP AREA (WITH AT LEAST 1 ACFT RUNNING-UP IN PLACE) AND JUST ABOUT RIGHT OVER OUR ACFT TAXIING IN. WE ASKED GND ABOUT HIM AND WERE TOLD THAT THE LIGHT ACFT IS INSTRUCTED TO NOT CONFLICT WITH DEPARTING B737 TFC FROM PARALLEL RWY (WHICH INVOLVES A L TURN-OUT OVER THE TXWY). BUT AFTER 18 MONTHS OF OPS AT SNA; I HAVE NEVER SEEN A TURN-OUT SO SOON; SO LOW. USUALLY THEY CLB ON CTRLINE TO 100-200 FT AND THEN TURN. THIS PARTICULAR DAY THE TURN STARTED AT RWY END AND ACFT CROSSED TXWY AT APPROX 100 FT AGL (MY TAIL IS 36 FT 6 INCHES AGL). EARLY TURNS SHOULD BE OUTLAWED FROM RWY 19L. AIRLINERS ARE ALWAYS ON TXWY A TRYING TO AVOID LOW-FLYING DEPARTING ACFT. SO LET'S GET THE WORD OUT TO NOT TURN BEFORE A MINIMUM ALT AND NEVER FLY OVER A TAXIING AIRLINER (OR ANY ACFT). MOST IMPORTANTLY; THE CTLRS AT SNA ARE EXCELLENT -- VERY PROFESSIONAL UNDER VERY MARGINAL CONDITIONS. THEY ARE THE BEST TEAM TO CONSULT TO ENACT SAFETY PROCS TO PROTECT TAXIING ACFT.