Narrative:

While attempting to intercept runway 27R localizer from the north we encountered wake turbulence from the preceding heavy aircraft. The encounter was severe enough to raise concern over the safety of the aircraft so a full prescribed recovery was initiated. However, in the attempt to maintain control of the aircraft, we flew through the localizer. With this putting us more in line with approachs to runway 27L, ATC advised us to fly a 330 degree heading for the intercept. We advised approach of the event and proceeded with a normal approach and landing. The use of rudder as demonstrated in our training I really feel made a big difference in our roll recovery rate. Callback conversation with reporter revealed the following information: reporter states that he just completed the unusual attitude training and believes that helped him to recover so well and handle the situation quickly with minimal problems. He feels that ATC could help by bringing the heavier aircraft in at a lower altitude than the lighter acrs such as his F100. He feels the quartering tailwind was the problem causing the wake to remain.

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Original NASA ASRS Text

Title: FLC OF F100 ENCOUNTERS WAKE TURB WHILE INTERCEPTING THE ILS INTO ORD. IMMEDIATE CORRECTIVE ACTION, BUT THEY SLIDE OVER INTO THE APCH PATH FOR THE PARALLEL RWY.

Narrative: WHILE ATTEMPTING TO INTERCEPT RWY 27R LOC FROM THE N WE ENCOUNTERED WAKE TURB FROM THE PRECEDING HVY ACFT. THE ENCOUNTER WAS SEVERE ENOUGH TO RAISE CONCERN OVER THE SAFETY OF THE ACFT SO A FULL PRESCRIBED RECOVERY WAS INITIATED. HOWEVER, IN THE ATTEMPT TO MAINTAIN CTL OF THE ACFT, WE FLEW THROUGH THE LOC. WITH THIS PUTTING US MORE IN LINE WITH APCHS TO RWY 27L, ATC ADVISED US TO FLY A 330 DEG HDG FOR THE INTERCEPT. WE ADVISED APCH OF THE EVENT AND PROCEEDED WITH A NORMAL APCH AND LNDG. THE USE OF RUDDER AS DEMONSTRATED IN OUR TRAINING I REALLY FEEL MADE A BIG DIFFERENCE IN OUR ROLL RECOVERY RATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE JUST COMPLETED THE UNUSUAL ATTITUDE TRAINING AND BELIEVES THAT HELPED HIM TO RECOVER SO WELL AND HANDLE THE SIT QUICKLY WITH MINIMAL PROBS. HE FEELS THAT ATC COULD HELP BY BRINGING THE HEAVIER ACFT IN AT A LOWER ALT THAN THE LIGHTER ACRS SUCH AS HIS F100. HE FEELS THE QUARTERING TAILWIND WAS THE PROB CAUSING THE WAKE TO REMAIN.

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.