Wake turbulence encounter at 400 ft on approach. MD82 violent instant roll of aircraft to the right ...

Attributes
ACN	346263
Time
Date	199609
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 400 agl bound upper : 400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 1500
ASRS Report	346263
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Air Traffic Incident	other

Narrative:

Location: 1 mi ILS final runway 22R ord. Normal operation from bdl to ord. Were advised that we were following a heavy. TCASII was inoperative. Due to this and as a precaution, captain elected to fly 1 DOT above GS. Normal approach until 400 ft call. At a speed of reference plus 15 and 1 DOT above the GS and just below 400 ft, the airplane rolled unctlably right to about 60 degrees of bank. After looking at captain to insure he was flying I noted about full aileron input and felt opposite rudder input. We recovered in about 3-5 seconds I guess. We were below 300 ft, very nose high visually and executed a go around and landing on runway 14R at ord. Winds were reported as 340 degrees at 4 KTS by tower. No injuries. Another flawless performance by this captain who I know quite well. Aircraft we were following was a B767. Callback conversation with reporter revealed the following information: callback in conjunction with the special wake turbulence study. Aircraft verified as MD82. Reporter first officer related that the captain, PF, flew the aircraft very well at the time of the upset and instantly regained control. The captain was shocked and didn't feel comfortable continuing to fly in his present mental state, so he turned the aircraft over to the first officer who flew the next approach and landing to a different runway.

Original NASA ASRS Text

Title: WAKE TURB ENCOUNTER AT 400 FT ON APCH. MD82 VIOLENT INSTANT ROLL OF ACFT TO THE R UP TO 60 DEG BANK. PF, CAPT, COUNTERED THE ROLL IMMEDIATELY AND EXECUTED A GAR. WAKE WAS CAUSED BY B767 WHICH WAS TURNING OFF THE RWY AT THE TIME OF THE ENCOUNTER.

Narrative: LOCATION: 1 MI ILS FINAL RWY 22R ORD. NORMAL OP FROM BDL TO ORD. WERE ADVISED THAT WE WERE FOLLOWING A HVY. TCASII WAS INOP. DUE TO THIS AND AS A PRECAUTION, CAPT ELECTED TO FLY 1 DOT ABOVE GS. NORMAL APCH UNTIL 400 FT CALL. AT A SPD OF REF PLUS 15 AND 1 DOT ABOVE THE GS AND JUST BELOW 400 FT, THE AIRPLANE ROLLED UNCTLABLY R TO ABOUT 60 DEGS OF BANK. AFTER LOOKING AT CAPT TO INSURE HE WAS FLYING I NOTED ABOUT FULL AILERON INPUT AND FELT OPPOSITE RUDDER INPUT. WE RECOVERED IN ABOUT 3-5 SECONDS I GUESS. WE WERE BELOW 300 FT, VERY NOSE HIGH VISUALLY AND EXECUTED A GAR AND LNDG ON RWY 14R AT ORD. WINDS WERE RPTED AS 340 DEGS AT 4 KTS BY TWR. NO INJURIES. ANOTHER FLAWLESS PERFORMANCE BY THIS CAPT WHO I KNOW QUITE WELL. ACFT WE WERE FOLLOWING WAS A B767. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK IN CONJUNCTION WITH THE SPECIAL WAKE TURB STUDY. ACFT VERIFIED AS MD82. RPTR FO RELATED THAT THE CAPT, PF, FLEW THE ACFT VERY WELL AT THE TIME OF THE UPSET AND INSTANTLY REGAINED CTL. THE CAPT WAS SHOCKED AND DIDN'T FEEL COMFORTABLE CONTINUING TO FLY IN HIS PRESENT MENTAL STATE, SO HE TURNED THE ACFT OVER TO THE FO WHO FLEW THE NEXT APCH AND LNDG TO A DIFFERENT RWY.

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.

Wake turbulence encounter at 400 ft on approach. MD82 violent instant roll of aircraft to the right up to 60 degree bank. PF, captain, countered the roll immediately and executed a go around. Wake was caused by B767 which was turning off the runway at the time of the encounter.