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Flight crew of medium large transport following an large transport on approach for landing 3 pt 5 mi in trail, flew high as aware of possible wake turbulence. 50 ft AGL encountered strong wake turbulence. Aircraft momentarily out of control, full thrust, full aileron recovery, go around.
| Attributes | |
| ACN | 188899 |
| Time | |
| Date | 199109 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 50 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : ord artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | landing : go around landing other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 120 flight time total : 18000 flight time type : 5000 |
| ASRS Report | 188899 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter other other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
As captain and PF I was vectored for parallel visual ord using 14L and 14R. Was cleared for visual. I was flying GS down. Experienced more wake turbulence from preceding aircraft than was usual. TCASII showed about 3.5 mi behind. I elected to fly about 1 DOT high and stay out of his wake and to land past his touchdown point. Air was fairly smooth at 1 DOT high. Saw my inner marker light flash and then extinguish, was now 1/2 DOT high. At approximately 50 ft AGL aircraft rolled rapidly right then violently left. Countered with full right aileron. Aircraft continued left roll. Went to maximum power then firewall power. We accelerated through wake zone. On go around tower advised of conflicting traffic that had departed 22L. We had a visual on him and TCASII never issued any advisory. I did not consider him a threat at he was in excess of 3 mi. Never in 27 yrs have I experienced such wake turbulence. Aircraft we were following was large transport. We are medium large transport. For a period of a couple seconds my aircraft was out of control due to the severity of wake. No recommendations as I said 3.5 in trail. Wind was 170 degree/7.
Original NASA ASRS Text
Title: FLC OF MLG FOLLOWING AN LGT ON APCH FOR LNDG 3 PT 5 MI IN TRAIL, FLEW HIGH AS AWARE OF POSSIBLE WAKE TURB. 50 FT AGL ENCOUNTERED STRONG WAKE TURB. ACFT MOMENTARILY OUT OF CTL, FULL THRUST, FULL AILERON RECOVERY, GAR.
Narrative: AS CAPT AND PF I WAS VECTORED FOR PARALLEL VISUAL ORD USING 14L AND 14R. WAS CLRED FOR VISUAL. I WAS FLYING GS DOWN. EXPERIENCED MORE WAKE TURB FROM PRECEDING ACFT THAN WAS USUAL. TCASII SHOWED ABOUT 3.5 MI BEHIND. I ELECTED TO FLY ABOUT 1 DOT HIGH AND STAY OUT OF HIS WAKE AND TO LAND PAST HIS TOUCHDOWN POINT. AIR WAS FAIRLY SMOOTH AT 1 DOT HIGH. SAW MY INNER MARKER LIGHT FLASH AND THEN EXTINGUISH, WAS NOW 1/2 DOT HIGH. AT APPROX 50 FT AGL ACFT ROLLED RAPIDLY R THEN VIOLENTLY L. COUNTERED WITH FULL R AILERON. ACFT CONTINUED L ROLL. WENT TO MAX PWR THEN FIREWALL PWR. WE ACCELERATED THROUGH WAKE ZONE. ON GAR TWR ADVISED OF CONFLICTING TFC THAT HAD DEPARTED 22L. WE HAD A VISUAL ON HIM AND TCASII NEVER ISSUED ANY ADVISORY. I DID NOT CONSIDER HIM A THREAT AT HE WAS IN EXCESS OF 3 MI. NEVER IN 27 YRS HAVE I EXPERIENCED SUCH WAKE TURB. ACFT WE WERE FOLLOWING WAS LGT. WE ARE MLG. FOR A PERIOD OF A COUPLE SECONDS MY ACFT WAS OUT OF CTL DUE TO THE SEVERITY OF WAKE. NO RECOMMENDATIONS AS I SAID 3.5 IN TRAIL. WIND WAS 170 DEG/7.
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.