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Wake encounter. Controller reporter received report from pilot of an E120 saying a wake almost rolled over the aircraft. Following a B757 in prescribed in trail spacing, 5 mi, controller slowed the reporter aircraft as well as approved a higher altitude.
| Attributes | |
| ACN | 342059 |
| Time | |
| Date | 199607 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 6 controller radar : 15 controller supervisory : 2 |
| ASRS Report | 342059 |
| 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 | controller : issued new clearance flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
B757 was preceding an E120 on downwind arrival into lax. The E120 was 5+ mi in trail of the B757 when the E120 pilot was almost rolled over due to wake turbulence. The E120 pilot advised that he would like to stay above the B757's altitude, which I approved, and I also approved a slower speed to increase the distance in trail. The distance required behind B757's is obviously not enough as this dangerous situation demonstrates.
Original NASA ASRS Text
Title: WAKE ENCOUNTER. CTLR RPTR RECEIVED RPT FROM PLT OF AN E120 SAYING A WAKE ALMOST ROLLED OVER THE ACFT. FOLLOWING A B757 IN PRESCRIBED IN TRAIL SPACING, 5 MI, CTLR SLOWED THE RPTR ACFT AS WELL AS APPROVED A HIGHER ALT.
Narrative: B757 WAS PRECEDING AN E120 ON DOWNWIND ARR INTO LAX. THE E120 WAS 5+ MI IN TRAIL OF THE B757 WHEN THE E120 PLT WAS ALMOST ROLLED OVER DUE TO WAKE TURB. THE E120 PLT ADVISED THAT HE WOULD LIKE TO STAY ABOVE THE B757'S ALT, WHICH I APPROVED, AND I ALSO APPROVED A SLOWER SPD TO INCREASE THE DISTANCE IN TRAIL. THE DISTANCE REQUIRED BEHIND B757'S IS OBVIOUSLY NOT ENOUGH AS THIS DANGEROUS SIT DEMONSTRATES.
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.