Cutaway of a <a href="https://en.wikipedia.org/wiki/Pratt_%26_Whitney_JT9D" class="extiw" title="en:Pratt &amp; Whitney JT9D">Pratt &amp; Whitney JT9 -D7</a> turbofan engine as seen from the rear. The combustion chamber is visible immediately right, and the fan is seen in the background.
Previous to its installation at the <a href="https://en.wikipedia.org/wiki/Deutsches_Museum" class="extiw" title="en:Deutsches Museum">Deutsches Museum</a>, this engine was installed on a Lufthansa <a href="https://en.wikipedia.org/wiki/Boeing_747" class="extiw" title="en:Boeing 747">Boeing 747-200</a>.
<a href="//commons.wikimedia.org/wiki/User:Ariadacapo" title="User:Ariadacapo">Olivier Cleynen</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>