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The flight crew of an EMB120 encounters a sharp jolt from the wake of a preceding B757. All separation standards were met and there were no injuries or damage.
| Attributes | |
| ACN | 329184 |
| Time | |
| Date | 199602 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : fll |
| State Reference | FL |
| Altitude | agl bound lower : 500 agl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : fll |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 180 flight time total : 2500 flight time type : 1300 |
| ASRS Report | 329184 |
| 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 : exited adverse environment |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
We were issued takeoff instructions behind a B757 with the standard 5 mi in-trail and still encountered a strong wake turbulence from him at approximately 1500 ft AGL. We mentioned it to the tower and was told that we had 5 mi separation at the time. WX at fll was clear visibility 10 mi temperature 77 degrees winds 140 degrees 10 KTS. The wake did not require evasive maneuver, but was strong regardless. Callback conversation with reporter revealed the following information: the reporter said that the primary effect from hitting the wake was a sharp jolt to the airframe. His EMB120 brasilia rolled slightly to the right. He said that the spacing was correct, but the calm conditions allowed the wake to remain stable and in position waiting for him. He rated the encounter as fairly severe because of the violence of the jolt. The encounter only lasted 1 or 2 seconds. The 'jolt' occurred at about 500 or 600 ft above the surface during climb out.
Original NASA ASRS Text
Title: THE FLC OF AN EMB120 ENCOUNTERS A SHARP JOLT FROM THE WAKE OF A PRECEDING B757. ALL SEPARATION STANDARDS WERE MET AND THERE WERE NO INJURIES OR DAMAGE.
Narrative: WE WERE ISSUED TKOF INSTRUCTIONS BEHIND A B757 WITH THE STANDARD 5 MI IN-TRAIL AND STILL ENCOUNTERED A STRONG WAKE TURB FROM HIM AT APPROX 1500 FT AGL. WE MENTIONED IT TO THE TWR AND WAS TOLD THAT WE HAD 5 MI SEPARATION AT THE TIME. WX AT FLL WAS CLR VISIBILITY 10 MI TEMP 77 DEGS WINDS 140 DEGS 10 KTS. THE WAKE DID NOT REQUIRE EVASIVE MANEUVER, BUT WAS STRONG REGARDLESS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT THE PRIMARY EFFECT FROM HITTING THE WAKE WAS A SHARP JOLT TO THE AIRFRAME. HIS EMB120 BRASILIA ROLLED SLIGHTLY TO THE R. HE SAID THAT THE SPACING WAS CORRECT, BUT THE CALM CONDITIONS ALLOWED THE WAKE TO REMAIN STABLE AND IN POS WAITING FOR HIM. HE RATED THE ENCOUNTER AS FAIRLY SEVERE BECAUSE OF THE VIOLENCE OF THE JOLT. THE ENCOUNTER ONLY LASTED 1 OR 2 SECONDS. THE 'JOLT' OCCURRED AT ABOUT 500 OR 600 FT ABOVE THE SURFACE DURING CLBOUT.
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.