Auxiliary Power Unit (A.P.U.) Bellows

Auxiliary Power Unit (A.P.U.) Bellows

Auxiliary Power Units (A.P.U.) are smaller engines that power vehicle subsystems. They are chiefly employed to start larger turbine systems on aircraft or as a cost effective alternative to running primary power systems on a diesel truck, like a sleeper cab or a trailers’ refrigeration system.

Senior Flexonics manufactures A.P.U. bellows and A.P.U. bellows assemblies for these types of applications.  We provide many customers with complete systems allowing for “drop in” assembly.


  • Aircraft
  • Diesel Trucks
  • Locomotives


  • A.P.U. Bellows