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When climbing behind an advanced large transport, an medium large transport aircraft experiences rolls 25 degrees left and right of wings level.
| Attributes | |
| ACN | 256700 |
| Time | |
| Date | 199311 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 2200 msl bound upper : 2200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 6000 flight time type : 3000 |
| ASRS Report | 256700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | inflight encounter other other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
After departure in the quiet EPR phase of flight, we encountered the wake of an large transport with no warning. We encountered a violent roll left 25 degrees and then a violent roll back to right into a 25 degree bank. Controllers in msp and dtw were giving us the same departure path as the large transport. We need to make controllers and pilots aware of the wake hazards of large transport to medium large transport size aircraft. We need to have wake separations and/or be given separate departure paths. Let's not use crisis management on this issue -- we have a problem! Callback conversation with reporter revealed the following information: reporter asked for a callback. He just wanted to reiterate his concern about the wake turbulence problems caused by the advanced large transport.
Original NASA ASRS Text
Title: WHEN CLBING BEHIND AN ADVANCED LGT, AN MLG ACFT EXPERIENCES ROLLS 25 DEGS L AND R OF WINGS LEVEL.
Narrative: AFTER DEP IN THE QUIET EPR PHASE OF FLT, WE ENCOUNTERED THE WAKE OF AN LGT WITH NO WARNING. WE ENCOUNTERED A VIOLENT ROLL L 25 DEGS AND THEN A VIOLENT ROLL BACK TO R INTO A 25 DEG BANK. CTLRS IN MSP AND DTW WERE GIVING US THE SAME DEP PATH AS THE LGT. WE NEED TO MAKE CTLRS AND PLTS AWARE OF THE WAKE HAZARDS OF LGT TO MLG SIZE ACFT. WE NEED TO HAVE WAKE SEPARATIONS AND/OR BE GIVEN SEPARATE DEP PATHS. LET'S NOT USE CRISIS MGMNT ON THIS ISSUE -- WE HAVE A PROB! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ASKED FOR A CALLBACK. HE JUST WANTED TO REITERATE HIS CONCERN ABOUT THE WAKE TURB PROBS CAUSED BY THE ADVANCED LGT.
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.