Wake turbulence encounter. Intrail B737-200 of an L1011, 15 DME, B737 hit turbulence causing rapid r...

Attributes
ACN	341923
Time
Date	199607
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rbv
State Reference	NJ
Altitude	msl bound lower : 19800 msl bound upper : 19800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 198 flight time total : 8400 flight time type : 2400
ASRS Report	341923
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : exited adverse environment
Consequence	other
Supplementary
Air Traffic Incident	other

Narrative:

FYI. I had what is being classified as a wake turbulence encounter on may/fri/96 and your office called me for the 30 min question and answer interview. I'm sending you another one for you to put in your study to send to the FAA so (maybe) they won't reduce spacing on aircraft. Step climbing on airway behind L1011. Had L1011 visually and on TCASII the whole route. When we hit his wake, he was 15 mi ahead, and 2000 ft higher. We were doing economy climb, through FL198 for FL200. Having been in severe wake before, I knew that that's what it was. Aircraft rolled abruptly left, then right, and eventually stabilized. No gain or loss of altitude. Correction: told ATC that we were going to fly a parallel course on the upwind (west) wide. He soon after cleared us direct to a fix up the road, with a change in course. Luckily, no one was hurt (one of our flight attendants was pregnant, too). Next time, I'll stay slightly upwind of course! Callback conversation with reporter revealed the following information: callback was in conjunction with wake turbulence incident callback questionnaire. The encounter caused reporter aircraft to roll 25 degrees both left and right before flight crew was able to regain control. The violent encounter threw flight attendants around the aircraft, but none were injured, though it created a lot of discomfort and stress.

Original NASA ASRS Text

Title: WAKE TURB ENCOUNTER. INTRAIL B737-200 OF AN L1011, 15 DME, B737 HIT TURB CAUSING RAPID ROLLS L AND R WITH FLT ATTENDANTS THROWN AROUND IN ACFT. NO INJURIES, BUT MUCH STRESS.

Narrative: FYI. I HAD WHAT IS BEING CLASSIFIED AS A WAKE TURB ENCOUNTER ON MAY/FRI/96 AND YOUR OFFICE CALLED ME FOR THE 30 MIN QUESTION AND ANSWER INTERVIEW. I'M SENDING YOU ANOTHER ONE FOR YOU TO PUT IN YOUR STUDY TO SEND TO THE FAA SO (MAYBE) THEY WON'T REDUCE SPACING ON ACFT. STEP CLBING ON AIRWAY BEHIND L1011. HAD L1011 VISUALLY AND ON TCASII THE WHOLE RTE. WHEN WE HIT HIS WAKE, HE WAS 15 MI AHEAD, AND 2000 FT HIGHER. WE WERE DOING ECONOMY CLB, THROUGH FL198 FOR FL200. HAVING BEEN IN SEVERE WAKE BEFORE, I KNEW THAT THAT'S WHAT IT WAS. ACFT ROLLED ABRUPTLY L, THEN R, AND EVENTUALLY STABILIZED. NO GAIN OR LOSS OF ALT. CORRECTION: TOLD ATC THAT WE WERE GOING TO FLY A PARALLEL COURSE ON THE UPWIND (W) WIDE. HE SOON AFTER CLRED US DIRECT TO A FIX UP THE ROAD, WITH A CHANGE IN COURSE. LUCKILY, NO ONE WAS HURT (ONE OF OUR FLT ATTENDANTS WAS PREGNANT, TOO). NEXT TIME, I'LL STAY SLIGHTLY UPWIND OF COURSE! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK WAS IN CONJUNCTION WITH WAKE TURB INCIDENT CALLBACK QUESTIONNAIRE. THE ENCOUNTER CAUSED RPTR ACFT TO ROLL 25 DEGS BOTH L AND R BEFORE FLC WAS ABLE TO REGAIN CTL. THE VIOLENT ENCOUNTER THREW FLT ATTENDANTS AROUND THE ACFT, BUT NONE WERE INJURED, THOUGH IT CREATED A LOT OF DISCOMFORT AND STRESS.

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.

Wake turbulence encounter. Intrail B737-200 of an L1011, 15 DME, B737 hit turbulence causing rapid rolls left and right with flight attendants thrown around in aircraft. No injuries, but much stress.