Leatherman
Any AMT or LAME worth their salt will have a Leatherman in their toolbox. If they are not flying as a flying spanner, then they are very likely to have it clipped onto their belt. The Leatherman Wave or Supertool has an excellent hacksaw. Modern day security busybodies get very nervous letting engineers fly on planes with tools these days.
If on flying duties he or she might have a lightweight toolbox stowed in the cockpit, or a larger metal line tool box loaded into the bulk cargo.
Flying spanner - Colloquial term for an aircraft engineer employed on flying duties.
I'm a flying spanner currently on B767s but I also have B777 type rating.