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F100 flight crew has wake turbulence encounter in trail of an MD11 with a 45 degree left roll. TCASII indicated 10 mi in trail. The event happened twice and reporter requested altitude change. Controller gave vector to avoid wake turbulence.
| Attributes | |
| ACN | 377022 |
| Time | |
| Date | 199708 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 1100 msl bound upper : 16000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | approach : visual arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 377022 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | inflight encounter other other anomaly other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : regained aircraft control other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Inside bonham on bonham arrival, we were following unknown traffic inside bonham intersection descending through about 15000 ft. TCASII showed us exactly 10 NM in trail. I was flying on autoplt 1. Suddenly, we encountered what seemed like pre- stall buffet with airspeed approximately 275 KIAS. Next, the aircraft rolled rapidly left to about 45 degrees. I disconnected the autoplt, rolled wings level, and leveled off. We asked the type we were following, and were told we were in trail of a company MD11. Several mins later, the event happened again. We asked for an altitude change and were told the MD11 was at 5000 ft. We were given a turn away from the MD11's flight path. Subsequently, we requested runway 17R, partly to stay away from the MD11, and also because we were late due to WX. After being assigned the visual to runway 17R, I lined up on runway 17L for a short period of time, then completed an uneventful approach and landing on runway 17R. I'm sure the concern over the MD11, the added workload of switching runways, and trying to get the folks to their destinations all contributed to my error. In closing I was surprised by the effect the wake turbulence had on my F100. Both times, I thought we were experiencing pre-stall buffet. There were no stick shaker or other warnings present, however.
Original NASA ASRS Text
Title: F100 FLC HAS WAKE TURB ENCOUNTER IN TRAIL OF AN MD11 WITH A 45 DEG L ROLL. TCASII INDICATED 10 MI IN TRAIL. THE EVENT HAPPENED TWICE AND RPTR REQUESTED ALT CHANGE. CTLR GAVE VECTOR TO AVOID WAKE TURB.
Narrative: INSIDE BONHAM ON BONHAM ARR, WE WERE FOLLOWING UNKNOWN TFC INSIDE BONHAM INTXN DSNDING THROUGH ABOUT 15000 FT. TCASII SHOWED US EXACTLY 10 NM IN TRAIL. I WAS FLYING ON AUTOPLT 1. SUDDENLY, WE ENCOUNTERED WHAT SEEMED LIKE PRE- STALL BUFFET WITH AIRSPD APPROX 275 KIAS. NEXT, THE ACFT ROLLED RAPIDLY L TO ABOUT 45 DEGS. I DISCONNECTED THE AUTOPLT, ROLLED WINGS LEVEL, AND LEVELED OFF. WE ASKED THE TYPE WE WERE FOLLOWING, AND WERE TOLD WE WERE IN TRAIL OF A COMPANY MD11. SEVERAL MINS LATER, THE EVENT HAPPENED AGAIN. WE ASKED FOR AN ALT CHANGE AND WERE TOLD THE MD11 WAS AT 5000 FT. WE WERE GIVEN A TURN AWAY FROM THE MD11'S FLT PATH. SUBSEQUENTLY, WE REQUESTED RWY 17R, PARTLY TO STAY AWAY FROM THE MD11, AND ALSO BECAUSE WE WERE LATE DUE TO WX. AFTER BEING ASSIGNED THE VISUAL TO RWY 17R, I LINED UP ON RWY 17L FOR A SHORT PERIOD OF TIME, THEN COMPLETED AN UNEVENTFUL APCH AND LNDG ON RWY 17R. I'M SURE THE CONCERN OVER THE MD11, THE ADDED WORKLOAD OF SWITCHING RWYS, AND TRYING TO GET THE FOLKS TO THEIR DESTS ALL CONTRIBUTED TO MY ERROR. IN CLOSING I WAS SURPRISED BY THE EFFECT THE WAKE TURB HAD ON MY F100. BOTH TIMES, I THOUGHT WE WERE EXPERIENCING PRE-STALL BUFFET. THERE WERE NO STICK SHAKER OR OTHER WARNINGS PRESENT, HOWEVER.
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.