POSSIBLE PENETRATOIN OF ARSA.

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LORAN C DIRECT FLT FROM CMH TO BMG PASSING THROUGH ATA'S OF SPH AND FFO IN S WESTERLY DIRECTION. ALT VARYING BTWN 3000' MSL AND 3200' MSL DUE TO LIGHT TURB. CALLED SPH FOR ATA PASSAGE. AFTER RELEASE FROM SPH CALLED FFO AT 'X' ON CHART EXCERPT. FFO REQUESTED RPT OF ALT AND DEP FROM AREA. I RPTED 3200' MSL; LATER RPTED AT 'O' SW OF WRIGHT AFB. FFO CLOSED COM BY AUTHORIZING CHANGE OF FREQ. LORAN TRACK INDICATED BY SOLID BLACK LINE. PATH OF FLT INDICATED BY BLACK DASHED LINE ADJACENT TO IT. HAVING RPTED CLR OF THE ATA I SUDDENLY REALIZED I WAS IN IMMEDIATE DANGER OF ENTERING DAY-ARSA DUE TO ALT. I AM CONVINCED OF NOT PENETRATING THE ARSA BECAUSE AT NO TIME DID I PROCEED N OF A LINE FROM THE 'X' TO THE 2079' TWRS INSIDE THE BOX. HAVING REALIZED POSSIBLE INCURSION INTO THE ARSA; I DIVERTED LEFT AS SHOWN BY THE DASHED LINE; WELL TO THE LEFT OF THE TALL TWRS AND DSNDED TO 1800' MSL. (DSCNT FOR LESS HEADWIND AND HAVING PASSED THE DAY POPULATED AREA.) SUPPOSE I HAD BEEN ELSEWHERE IN THE FFO-ATA AND BEEN RELEASED IMMEDIATELY INTO THE DAY ARSA? GIVEN THE DIMENSIONS OF THE ARSA; WHO HAS JURISDICTION WHERE THE FFO ATA AND DAY ARSA OVERLAP? ATA GOES TO 3824' MSL; ARSA BEGINS AT 2400' MSL. ABOVE 2400' MSL; DOES FFO TWR STILL SUPERVISE THE ATA IN THE AREA OF OVERLAP? THE CTLR AND FFO COULD HAVE PERCEIVED THE POSSIBLE DANGER OF ENTRY INTO THE ARSA AND ISSUED A CAUTIONARY REMARK TO REMAIN CLR OF THE ARSA. SUCH IS THE CASE; FOR INSTANCE; ON A CONTINUAL BASIS AT LOUISVILLE BOWMAN ATC TWR. PLTS ARE CONSTANTLY INSTRUCTED TO REMAIN CLR OF THE SDF ARSA. ASIDE FROM THE FACT THAT THE PIC IS RESPONSIBLE FOR THE CONDUCT OF HIS ACFT REGARDLESS OF ATC INFLUENCE; AND MY IMMEDIATE SCENARIO NOTWITHSTANDING; THERE IS ROOM TO QUESTION WHETHER ANY CLARIFYING COMMENTS SHOULD HAVE BEEN ISSUED BY THE LCL CTLR. CERTAINLY A CAUTION ABOUT THE ALT WOULD HAVE BEEN HELPFUL TO RAISE MY AWARENESS OF THE SITUATION. I HAVE FLOWN PREVIOUSLY THE SAME ROUTE AT LESS THAN 2400' MSL WITH NO PROB. AS A FLT INSTR; I ALSO WOULD LIKE TO KNOW WHAT THE STATUS FOR OPERATION IN THE NW HEMISPHERE OF THE FFO ATA WOULD BE UNDER SIMILAR CIRCUMSTANCES. SOME SORE OF CHART NOTATION SHOULD BE DEVISED TO INDICATE BETTER THE LAYERS OF SUPERVISION IN THE CASE I HAVE DESCRIBED. SEE THE ARSA TCA NOTATION FOR MDW AND ORD. DUE TO THE POSITIVE CTL ASPECT OF THE ORD TCA; MDW ARSA HAS CEILINGS NOTATED AS THE BASE OF THE TCA RATHER THAN THE STANDARD 4000' AGL. NOWHERE HAVE I SEEN DESCRIBED OR NOTATED WHERE AN ATA STOPS AT THE BASE OF AN ARSA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: DISCUSSED WITH THE RPTR REF HIS QUESTION WHEN AN ATA LIES WITHIN THE CONFINES OF AN ARSA. GENERALLY AN AGREEMENT BTWN THE CTLING FACS WHERE THEIR JURISDICTION BEGINS AND ENDS AND IN MOST CASES THE ATA WILL END AT THE BASE OF THE ARSA. RPTR IS A FLT INSTR AND WANTED THE INFO FOR HIS CLASSES. ADVISED HE SHOULD EMPHASIZE; IF IN DOUBT; TO CALL THE FAC CTLING THE ARSA PRIOR TO PENETRATION.