Narrative:

While on VOR runway 13L approach jfk over cri VORTAC and cleared for visual approach to runway 13L in smooth air approximately 5 mi in- trail of air carrier B747 was caught in wake turbulence and rolled approximately 45 degrees right bank. Recovered aircraft with full aileron (left) authority/authorized rudder and elevator to climb out of roll effect. Aileron with full left application was not enough to counter roll effect. Landed without further incident. Sure wish the big guys would stay on glide path or correct altitude on non precision approachs. Callback conversation with reporter revealed the following information: reporter participated in the wake turbulence structured callback study. Reporter anticipated that wake might be encountered so he got clearance to cross cri at his discretion of altitude. He flew 400 ft higher so as to avoid wake, however, what he didn't know was the preceding aircraft crossed cri higher than normal which resulted in flying into the wake of the B747-400. The BAE4101 encountered the wake and rolled 40 degrees with hardly any other flight path displacement. The effect of stress from the event didn't happen until the flight crew was on the ground for 45 mins. Then the flight crew began to be very bothered by the encounter.

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Original NASA ASRS Text

Title: A BAE4101 ENCOUNTERS WAKE TURB FROM A B747-400 DURING APCH INTO JFK, NY. ENCOUNTER ROLLS THE BAE4101 INTO A 40 DEG BANK EVEN WITH A 6 MI SEPARATION.

Narrative: WHILE ON VOR RWY 13L APCH JFK OVER CRI VORTAC AND CLRED FOR VISUAL APCH TO RWY 13L IN SMOOTH AIR APPROX 5 MI IN- TRAIL OF ACR B747 WAS CAUGHT IN WAKE TURB AND ROLLED APPROX 45 DEGS R BANK. RECOVERED ACFT WITH FULL AILERON (L) AUTH RUDDER AND ELEVATOR TO CLB OUT OF ROLL EFFECT. AILERON WITH FULL L APPLICATION WAS NOT ENOUGH TO COUNTER ROLL EFFECT. LANDED WITHOUT FURTHER INCIDENT. SURE WISH THE BIG GUYS WOULD STAY ON GLIDE PATH OR CORRECT ALT ON NON PRECISION APCHS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE WAKE TURB STRUCTURED CALLBACK STUDY. RPTR ANTICIPATED THAT WAKE MIGHT BE ENCOUNTERED SO HE GOT CLRNC TO CROSS CRI AT HIS DISCRETION OF ALT. HE FLEW 400 FT HIGHER SO AS TO AVOID WAKE, HOWEVER, WHAT HE DIDN'T KNOW WAS THE PRECEDING ACFT CROSSED CRI HIGHER THAN NORMAL WHICH RESULTED IN FLYING INTO THE WAKE OF THE B747-400. THE BAE4101 ENCOUNTERED THE WAKE AND ROLLED 40 DEGS WITH HARDLY ANY OTHER FLT PATH DISPLACEMENT. THE EFFECT OF STRESS FROM THE EVENT DIDN'T HAPPEN UNTIL THE FLC WAS ON THE GND FOR 45 MINS. THEN THE FLC BEGAN TO BE VERY BOTHERED BY THE ENCOUNTER.

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.