Narrative:

Roc-lga. Established on lga lda-a approach runway 22. At 3000 ft (level) approximately D15 from lga (outside casle intersection) aircraft was at approximately 220 KIAS and reducing speed (clean confign, autothrottles off). I was flying aircraft manually when left wing abruptly dropped. Captain and I both fought movement of aircraft as right wing abruptly dropped. Aircraft rolled approximately 30 degrees left, then 30 degrees right, then stabilized. No further event took place. Aircraft was landed normally. Approach control, when asked, advised us we were following a B727 5 mi ahead, and this was verified by TCASII. Nose did not pitch up or down, and air was calm. Callback conversation with reporter revealed the following information: the reporter was hand flying a B737-200 during this event. She said that she had both feet on the rudder pedals and her right hand was on the control wheel and her left hand was on the thrust levers. Both of the flight crew saw the preceding B727-200 ahead and off to their right (lined up runway 22 instead of with the lda course). The roll and yaw came without any warning. The reporter said that the movements were very sharp. The initial roll was to the left and then to the right. More concerning to her were the yaw moments. Initially to the left then to the right and then back and forth for a total of 6 oscillations of between 5-10 degrees. The rolls were to about 30 degrees initially. The reporter said that she felt that they had no control over the aircraft during the 9-10 seconds that these oscillations lasted. The reporter was adamant that these maneuvers may not be caused by turbulence. She said that the manufacturer's representatives pulled the fdr and the cvr and investigated the incident, but she has not been appraised of any findings.

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Original NASA ASRS Text

Title: THIS ACR FLC EXPERIENCED A SERIES OF SHARP ROLLS AND YAWS FIRST TO THE L AND THEN TO THE R WITH THE BANK ANGLES UP TO 30 DEGS AND THE YAWS TO BTWN 5-10 DEGS. THE RPTR WAS BEHIND A B727-200, BUT IS UNSURE IF IT WAS THE CAUSE OF THIS EVENT.

Narrative: ROC-LGA. ESTABLISHED ON LGA LDA-A APCH RWY 22. AT 3000 FT (LEVEL) APPROX D15 FROM LGA (OUTSIDE CASLE INTXN) ACFT WAS AT APPROX 220 KIAS AND REDUCING SPD (CLEAN CONFIGN, AUTOTHROTTLES OFF). I WAS FLYING ACFT MANUALLY WHEN L WING ABRUPTLY DROPPED. CAPT AND I BOTH FOUGHT MOVEMENT OF ACFT AS R WING ABRUPTLY DROPPED. ACFT ROLLED APPROX 30 DEGS L, THEN 30 DEGS R, THEN STABILIZED. NO FURTHER EVENT TOOK PLACE. ACFT WAS LANDED NORMALLY. APCH CTL, WHEN ASKED, ADVISED US WE WERE FOLLOWING A B727 5 MI AHEAD, AND THIS WAS VERIFIED BY TCASII. NOSE DID NOT PITCH UP OR DOWN, AND AIR WAS CALM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS HAND FLYING A B737-200 DURING THIS EVENT. SHE SAID THAT SHE HAD BOTH FEET ON THE RUDDER PEDALS AND HER R HAND WAS ON THE CTL WHEEL AND HER L HAND WAS ON THE THRUST LEVERS. BOTH OF THE FLC SAW THE PRECEDING B727-200 AHEAD AND OFF TO THEIR R (LINED UP RWY 22 INSTEAD OF WITH THE LDA COURSE). THE ROLL AND YAW CAME WITHOUT ANY WARNING. THE RPTR SAID THAT THE MOVEMENTS WERE VERY SHARP. THE INITIAL ROLL WAS TO THE L AND THEN TO THE R. MORE CONCERNING TO HER WERE THE YAW MOMENTS. INITIALLY TO THE L THEN TO THE R AND THEN BACK AND FORTH FOR A TOTAL OF 6 OSCILLATIONS OF BTWN 5-10 DEGS. THE ROLLS WERE TO ABOUT 30 DEGS INITIALLY. THE RPTR SAID THAT SHE FELT THAT THEY HAD NO CTL OVER THE ACFT DURING THE 9-10 SECONDS THAT THESE OSCILLATIONS LASTED. THE RPTR WAS ADAMANT THAT THESE MANEUVERS MAY NOT BE CAUSED BY TURB. SHE SAID THAT THE MANUFACTURER'S REPRESENTATIVES PULLED THE FDR AND THE CVR AND INVESTIGATED THE INCIDENT, BUT SHE HAS NOT BEEN APPRAISED OF ANY FINDINGS.

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.