CTLR COMPLAINS THAT THE ADJACENT APCH CTL FACILITY DSNDS ACFT INTO THEIR AIRSPACE WITHOUT PRIOR COORD OR APPROVAL.

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AT ABOUT XX28 EST; PHL APCH CTL DSNDED AN ACR INTO ACY APCH CTL AIRSPACE WITHOUT OBTAINING APPROVAL. I CONTACTED THE APCH CTLR AT PHL WHO HAD CAUSED THE VIOLATION; INFORMED HIM THAT I HAD OBSERVED THE VIOLATION; AND TOLD HIM THAT IF HE NEEDED TO USE ANY PORTION OF ACY AIRSPACE; THAT HE WOULD HAVE TO MAKE A REQUEST TO DO SO; AND THAT APPROVAL MUST BE GIVEN BEFORE HE COULD CLR AN ACFT TO ENTER ACY AIRSPACE. PHL ARRS ARE REQUIRED TO MAINTAIN 8000 FT UNTIL 1 1/2 NM INTO PHL AIRSPACE; UNLESS APPROVAL IS OBTAINED TO DO OTHERWISE. AT XX31 EST; ACR X; LGT; WAS OBSERVED 3 NM INSIDE ACY AIRSPACE AT 6400 FT DSNDING. I IMMEDIATELY CALLED THE PHL CTLR RESPONSIBLE AND ASKED HIM WHAT ACR X WAS DOING. HE REPLIED THAT ACR X WAS 'DSNDING TO 4000.' I REITERATED THE NEED FOR PHL APCH TO OBTAIN APPROVAL PRIOR TO ENTERING ACY AIRSPACE. THE CTLR'S REPLY: 'SORRY.' AT THIS POINT; I BEGAN TO MONITOR PHL APCH FREQ 126.6 TO ALLOW ME TO HEAR THE CTL INSTRUCTIONS BEING ISSUED TO THE PHL ARRS OVER VCN VOR. AT XX46 EST; ACR Y; AN LGT; WAS 2 NM N OF VCN (STILL OVER ACY AIRSPACE); AND WAS INSTRUCTED BY PHL APCH TO 'DSND AND MAINTAIN 3000.' ACR Y ENTERED ACY AIRSPACE WITHOUT APPROVAL AND DEPARTED ACY AIRSPACE AT 7000 FT DSNDING. AT THIS TIME; PHL APCH SUPVR WAS CONTACTED AND HE SAID HE WOULD 'TAKE CARE OF IT.' THE UNSAFE PRACTICE OF PHL APCH DSNDING IFR ACFT THROUGH ACY AIRSPACE WITHOUT APPROVAL IS AN ONGOING PROB. IT IS NOT UNCOMMON FOR ACY APCH TO HAVE TFC RTED OVER VCN AREA AT 6000 FT AND 7000 FT. IF PHL APCH CONTINUES THIS PRACTICE; ACFT SEPARATION STANDARDS ARE JEOPARDIZED AND THE POTENTIAL FOR ACFT CONFLICT IS GREATLY INCREASED.