Narrative:

While en-route; we were warned of possible wake-turbulence from 747 ahead of us. My first officer and I acknowledged. Up to this point we had a smooth ride. We were level at FL230 when the aircraft sharply rolled to the left. I would say somewhere in the 60 degree range. It was very intense; the autopilot never disengaged and rolled itself level again. Due to the severity of the situation; my first officer asked for an immediate deviation off course due to severe turbulence from the 747's wake. We were then given a heading and later asked if we could return on course. We asked ATC if the 747 was on the same route as we were and ATC verified that. We said unable and asked to parallel the course until we had more separation. We were granted that request and then eventually given direct as the 747 turned off course. After my first officer and I got things situated in the cockpit with our routing and ensuring that we were out of the 747's wake; I spoke with my flight attendants and made an announcement to the passengers to ensure them that everything was ok. I checked in with my flight attendants to ensure everyone was ok twice more before the flight was over. I was told that one girl had gotten coffee spilled all over her shirt. Thankfully the flight attendants were not hurt and nobody else was standing at the time of the incident. I sent and ACARS to dispatched informing them of the situation and asked them to inform the customer service agent at the gate that we may have some passengers that were shaken up by the experience and one customer with coffee stains on her shirt. Nobody was injured. Once we landed; tower gave us two numbers for ATC and informed us that we were to call them. I greeted all the passengers off the aircraft to be sure everyone was ok and spoke to the young lady that had coffee on her. She assured me she was ok; needed no medical attention and was not concerned with the coffee on her shirt.

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Original NASA ASRS Text

Title: An ERJ-170 encountered wake turbulence 9.5 MI behind and 3;300 FT lower than a B747 causing a 60 degree bank.

Narrative: While en-route; we were warned of possible wake-turbulence from 747 ahead of us. My First Officer and I acknowledged. Up to this point we had a smooth ride. We were level at FL230 when the aircraft sharply rolled to the left. I would say somewhere in the 60 degree range. It was very intense; the autopilot never disengaged and rolled itself level again. Due to the severity of the situation; my First Officer asked for an immediate deviation off course due to severe turbulence from the 747's wake. We were then given a heading and later asked if we could return on course. We asked ATC if the 747 was on the same route as we were and ATC verified that. We said unable and asked to parallel the course until we had more separation. We were granted that request and then eventually given direct as the 747 turned off course. After my First Officer and I got things situated in the cockpit with our routing and ensuring that we were out of the 747's wake; I spoke with my flight attendants and made an announcement to the passengers to ensure them that everything was ok. I checked in with my flight attendants to ensure everyone was ok twice more before the flight was over. I was told that one girl had gotten coffee spilled all over her shirt. Thankfully the flight attendants were not hurt and nobody else was standing at the time of the incident. I sent and ACARS to dispatched informing them of the situation and asked them to inform the Customer Service Agent at the gate that we may have some passengers that were shaken up by the experience and one customer with coffee stains on her shirt. Nobody was injured. Once we landed; tower gave us two numbers for ATC and informed us that we were to call them. I greeted all the passengers off the aircraft to be sure everyone was ok and spoke to the young lady that had coffee on her. She assured me she was ok; needed no medical attention and was not concerned with the coffee on her shirt.

Data retrieved from NASA's ASRS site as of April 2012 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.