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Flight crew of medium large transport on landing flare behind a 2-ENGINE large transport that had previously landed encountered vortex roll.
| Attributes | |
| ACN | 177135 |
| Time | |
| Date | 199104 |
| Day | Sun |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 700 |
| Environment | |
| Flight Conditions | Mixed |
| Aircraft 1 | |
| Controlling Facilities | tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other landing other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other ground other : taxi landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 250 flight time total : 17000 flight time type : 2600 |
| ASRS Report | 177135 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Events | |
| Anomaly | inflight encounter other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
As we were in the final phases of our landing (in the flare at about 100' above the threshold) we encountered turbulence that rolled us into about a 25-30 degree right bank. The aircraft was rolled abruptly and began to slip into the right-hand side of the runway and the T/D was made with the right wing protruding over the runway lights. The T/D was reasonably smooth with no further problems. The cause of the turbulence was a 2-ENG large transport that had landed just ahead of us and was well clear of the runway when our incident occurred. The point of this report is that the large transport was not a heavy and was not of particular concern for us because of the type of aircraft it was. I believe that some sort of comment should be made about the possibility of this type of vortex turbulence behind an aircraft that was not designated a heavy.
Original NASA ASRS Text
Title: FLT CREW OF MLG ON LNDG FLARE BEHIND A 2-ENGINE LGT THAT HAD PREVIOUSLY LANDED ENCOUNTERED VORTEX ROLL.
Narrative: AS WE WERE IN THE FINAL PHASES OF OUR LNDG (IN THE FLARE AT ABOUT 100' ABOVE THE THRESHOLD) WE ENCOUNTERED TURB THAT ROLLED US INTO ABOUT A 25-30 DEG RIGHT BANK. THE ACFT WAS ROLLED ABRUPTLY AND BEGAN TO SLIP INTO THE RIGHT-HAND SIDE OF THE RWY AND THE T/D WAS MADE WITH THE RIGHT WING PROTRUDING OVER THE RWY LIGHTS. THE T/D WAS REASONABLY SMOOTH WITH NO FURTHER PROBS. THE CAUSE OF THE TURB WAS A 2-ENG LGT THAT HAD LANDED JUST AHEAD OF US AND WAS WELL CLR OF THE RWY WHEN OUR INCIDENT OCCURRED. THE POINT OF THIS RPT IS THAT THE LGT WAS NOT A HVY AND WAS NOT OF PARTICULAR CONCERN FOR US BECAUSE OF THE TYPE OF ACFT IT WAS. I BELIEVE THAT SOME SORT OF COMMENT SHOULD BE MADE ABOUT THE POSSIBILITY OF THIS TYPE OF VORTEX TURB BEHIND AN ACFT THAT WAS NOT DESIGNATED A HVY.
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.