DC-9 EXPERIENCES WAKE TURB FOLLOWING A B-727.

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THIS LETTER IS IN RESPONSE TO CALLBACK #189 CONCERNING WAKE-TURB. I HAVE HAD 2 OCCURRENCES IN MY CAREER. THE FIRST WAS IN THE LATE 1960'S. LEAVING JFK; AT NIGHT; IFR; ENCOUNTERED TURB CLBING PIPER APACHE OUT AROUND 1500 FT. TO THIS DAY; I'M NOT SURE WHETHER WE MADE A COMPLETE ROLL. IT DID REQUIRE A RAPID RECOVERY FROM A PRETTY UNUSUAL ATTITUDE WHEN I COULD FINALLY READ THE INSTS. THE SECOND ENCOUNTER WAS AT OHR. I WAS FO ON A DC-9. INSIDE THE MM WE WERE PLACED INTO AN IMMEDIATE 90 DEG BANK TO THE R; ABOUT 100 FT ABOVE THE GND. THE CAPT APPLIED FULL PWR AND CORRECTIVE CTLS AND EXECUTED A SUCCESSFUL GAR. THE WX WAS CLR WITH A VERY LIGHT BREEZE. THE ACFT WE WERE FOLLOWING; AT NORMAL SPACING; WAS A B-727. THIS INCIDENT OCCURRED IN 1975. I HAVE TREATED ALL JET ACFT WITH RESPECT EVER SINCE; REGARDLESS OF SIZE. I AM PRESENTLY INSTRUCTING LIGHT AIRPLANE CFI AND CFII STUDENTS. MY MAIN THEME IS; IF YOU ARE IN A LIGHT ACFT; TREAT ALL AIRPLANES KING AIR SIZE OR LARGER AS IF THEY WERE ALL 747'S. YOUR LIGHT ACFT MIGHT NOT PASS THROUGH THE TURB FAST ENOUGH TO RECOVER.