Wake turbulence encounter.

Attributes
ACN	317196
Time
Date	199509
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 3200 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lga
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 3000
ASRS Report	317196
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Follow approximately 3 to 3.5 mi in trail of a B727 on river visual we encountered severe wake turbulence which lasted approximately 7 to 10 second. The vortex encountered took full right aileron and approximately 15 percent right rudder travel to correct. Both our MD80 (at approximately 110000 pounds) and the leading B727 were on approach (visual) to runway 13 at approximately 3500 ft to 3200 ft descending wings level on the approach. The most severe turbulence I have experienced in 10 plus yrs airline flying. Callback conversation with reporter revealed the following information: reporter says that he has had more wake turbulence encounters in the last 6 months than in the past 2 yrs. He believes that this is a result of ATC providing less separation between aircraft. His flight crew was especially surprised at the severity of the wake encounter being caused by a narrow body aircraft (B727). This encounter was so severe that reporter says if they had not immediately used full aileron and coordination rudder, they could have easily rolled inverted. Reporter was also concerned about takeoff procedures, particularly at dfw. There, they are taking aircraft off very close together. One aircraft still on takeoff roll when next aircraft is cleared for takeoff. Reporter says in one instance, they were already at 100 KTS and other aircraft, preceding, had not yet left runway. This sets up 2 potentially dangerous sits. One, if the lead aircraft suddenly aborted and the other is wake turbulence from close proximity of lead aircraft. Reporter says it is particularly bad in calm winds below 2000 ft.

Original NASA ASRS Text

Title: WAKE TURB ENCOUNTER.

Narrative: FOLLOW APPROX 3 TO 3.5 MI IN TRAIL OF A B727 ON RIVER VISUAL WE ENCOUNTERED SEVERE WAKE TURB WHICH LASTED APPROX 7 TO 10 SEC. THE VORTEX ENCOUNTERED TOOK FULL R AILERON AND APPROX 15 PERCENT R RUDDER TRAVEL TO CORRECT. BOTH OUR MD80 (AT APPROX 110000 LBS) AND THE LEADING B727 WERE ON APCH (VISUAL) TO RWY 13 AT APPROX 3500 FT TO 3200 FT DSNDING WINGS LEVEL ON THE APCH. THE MOST SEVERE TURB I HAVE EXPERIENCED IN 10 PLUS YRS AIRLINE FLYING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAYS THAT HE HAS HAD MORE WAKE TURB ENCOUNTERS IN THE LAST 6 MONTHS THAN IN THE PAST 2 YRS. HE BELIEVES THAT THIS IS A RESULT OF ATC PROVIDING LESS SEPARATION BTWN ACFT. HIS FLC WAS ESPECIALLY SURPRISED AT THE SEVERITY OF THE WAKE ENCOUNTER BEING CAUSED BY A NARROW BODY ACFT (B727). THIS ENCOUNTER WAS SO SEVERE THAT RPTR SAYS IF THEY HAD NOT IMMEDIATELY USED FULL AILERON AND COORD RUDDER, THEY COULD HAVE EASILY ROLLED INVERTED. RPTR WAS ALSO CONCERNED ABOUT TKOF PROCS, PARTICULARLY AT DFW. THERE, THEY ARE TAKING ACFT OFF VERY CLOSE TOGETHER. ONE ACFT STILL ON TKOF ROLL WHEN NEXT ACFT IS CLRED FOR TKOF. RPTR SAYS IN ONE INSTANCE, THEY WERE ALREADY AT 100 KTS AND OTHER ACFT, PRECEDING, HAD NOT YET LEFT RWY. THIS SETS UP 2 POTENTIALLY DANGEROUS SITS. ONE, IF THE LEAD ACFT SUDDENLY ABORTED AND THE OTHER IS WAKE TURB FROM CLOSE PROX OF LEAD ACFT. RPTR SAYS IT IS PARTICULARLY BAD IN CALM WINDS BELOW 2000 FT.

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.