An airline passenger almost got sucked out of the plane. A new report shows how it happened.

A Ryanair Boeing 737, like the one involved in the incident.

Xavier Bonilla/NurPhoto via Getty Images A Ryanair passenger was partially sucked out of a plane window last month.

The NTSB's preliminary report found that an engine fan blade broke off, shattering the window.

Pictures from the plane show substantial engine damage and a missing window.

Investigators released their first report on Thursday into how a Ryanair passenger ended up partially sucked out of a plane window.

The National Transportation Safety Board's preliminary report found that a fan blade broke off from the right engine, and engine fragments damaged the fuselage and shattered a window.

On July 10, the Boeing 737 was operating a flight from Thessaloniki, Greece, to Memmingen, Germany.

There were 149 passengers and six crew members on board.

As the plane was climbing through 16,000 feet, the pilots received a high-vibration indication for the right engine, the report said.

The crew followed the checklist, and the vibrations decreased, but then "increased significantly." The NTSB included several images from the incident in its report.

NTSB Investigators said there was a loud bang and a cabin altitude warning.

Passengers and the crew put on their oxygen masks.

The pilots started an emergency descent.

One of the flight attendants then saw that some passengers were standing up and calling for help.