Narrative:

I was serving as first officer and pilot flying on a flight. The captain was in command of the flight and pilot monitoring. During descent around 30;000 ft; there was a loud 'boom' and repetitive 'bump; bump; bump' noise coming from the aircraft. Engine gauges confirmed the #2 engine was the source of the heavy vibration. The flight attendants called the cockpit with the confirmation that something was wrong and with the status of the passengers. We declared an emergency and split the cockpit duties. I trimmed the aircraft for single engine flight while the captain completed the QRH engine severe damage checklist; coordinated with the cabin and company; and made PA's. Once the engine was shutdown; the noise and vibration went away. No fire or hydraulic problems were noted during flight after securing the engine. We continued with the arrival and vectors into our destination. I transferred control of the aircraft to the captain at approximately 20;000 ft and he brought the aircraft in for a safe landing. The airport weather was VMC. The airport emergency crew was notified well ahead of time and standing by as we landed. They reported no fire or abnormalities other than the damaged engine; so we continued to the gate while they followed. The passengers were then deplaned. Exterior inspection of the right engine showed a large dent in the leading edge of the cowl and damage to the inlet area and fan blades. The flight attendant crew did a great job keeping everyone calm and also with keeping us informed as we progressed. Center; approach and tower also provided outstanding support. I am suspecting that a large chunk of ice had built up on the fuselage by the forward potable water fill; became dislodged during the descent and was ingested into the right engine. Potable water quantity at pushback had been serviced to full. Potable water content upon arrival was zero. The flight attendants also noted that there was no water available in the lavatories for the entire flight. The captain was in contact with maintenance concerning this issue and possible leak.

Related reports:

Google
 

Original NASA ASRS Text

Title: A B757 flight crew experienced heavy vibration and abnormal noises from the #2 engine in descent. They ran the QRH; shut down the engine; coordinated with Dispatch and declared an emergency. The reporter believes it is likely that ice from the potable water fill area broke off and was ingested into the engine.

Narrative: I was serving as First Officer and pilot flying on a flight. The Captain was in command of the flight and pilot monitoring. During descent around 30;000 FT; there was a loud 'boom' and repetitive 'bump; bump; bump' noise coming from the aircraft. Engine gauges confirmed the #2 engine was the source of the heavy vibration. The Flight Attendants called the cockpit with the confirmation that something was wrong and with the status of the passengers. We declared an emergency and split the cockpit duties. I trimmed the aircraft for single engine flight while the Captain completed the QRH Engine Severe Damage checklist; coordinated with the cabin and company; and made PA's. Once the engine was shutdown; the noise and vibration went away. No fire or hydraulic problems were noted during flight after securing the engine. We continued with the arrival and vectors into our destination. I transferred control of the aircraft to the Captain at approximately 20;000 FT and he brought the aircraft in for a safe landing. The airport weather was VMC. The airport emergency crew was notified well ahead of time and standing by as we landed. They reported no fire or abnormalities other than the damaged engine; so we continued to the gate while they followed. The passengers were then deplaned. Exterior inspection of the right engine showed a large dent in the leading edge of the cowl and damage to the inlet area and fan blades. The flight attendant crew did a great job keeping everyone calm and also with keeping us informed as we progressed. Center; Approach and Tower also provided outstanding support. I am suspecting that a large chunk of ice had built up on the fuselage by the forward potable water fill; became dislodged during the descent and was ingested into the right engine. Potable water quantity at pushback had been serviced to full. Potable water content upon arrival was zero. The flight attendants also noted that there was no water available in the lavatories for the entire flight. The Captain was in contact with maintenance concerning this issue and possible leak.

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.