S80 encounters wake turbulence on very short final at ord.

Attributes
ACN	457680
Time
Date	199912
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	agl single value : 30
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 22l
Flight Phase	descent : approach descent other
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial ground : takeoff roll
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	457680
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : turbulence inflight encounter : wake turbulence inflight encounter other other anomaly other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment flight crew : regained aircraft control
Supplementary
Problem Areas	Weather Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Ord tower, runway 22L threshold. A non heavy aircraft had departed runway 22L about 45 seconds before our landing. First officer was PF. Smooth air down to about 40 ft, then we were rocked back and forth for about 2 seconds strong. I told the first officer to add power. He added some and then we touched down firm, but not hard. I am mostly sure that this was thrust wake from runway 22L, not runway 27L because the roll was both left and right -- not just to the left as it would have been if from runway 27L on my right. While I made a PA during taxi in to explain this to the passenger, it was unusual because at ord we rarely land on a departure runway. This is submitted for trend analysis.

Original NASA ASRS Text

Title: S80 ENCOUNTERS WAKE TURB ON VERY SHORT FINAL AT ORD.

Narrative: ORD TWR, RWY 22L THRESHOLD. A NON HVY ACFT HAD DEPARTED RWY 22L ABOUT 45 SECONDS BEFORE OUR LNDG. FO WAS PF. SMOOTH AIR DOWN TO ABOUT 40 FT, THEN WE WERE ROCKED BACK AND FORTH FOR ABOUT 2 SECONDS STRONG. I TOLD THE FO TO ADD PWR. HE ADDED SOME AND THEN WE TOUCHED DOWN FIRM, BUT NOT HARD. I AM MOSTLY SURE THAT THIS WAS THRUST WAKE FROM RWY 22L, NOT RWY 27L BECAUSE THE ROLL WAS BOTH L AND R -- NOT JUST TO THE L AS IT WOULD HAVE BEEN IF FROM RWY 27L ON MY R. WHILE I MADE A PA DURING TAXI IN TO EXPLAIN THIS TO THE PAX, IT WAS UNUSUAL BECAUSE AT ORD WE RARELY LAND ON A DEP RWY. THIS IS SUBMITTED FOR TREND ANALYSIS.

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.