Text in force at CS23-6: from CS23-5, effective 15 Aug 2017.
(a) For the purpose of this Subpart, the aeroplane powerplant installation must include each component that is necessary for propulsion, affects propulsion safety, or provides auxiliary power to the aeroplane.
(b) Each aeroplane engine, propeller and auxiliary power unit (APU) must be type certified, or meet accepted specifications.
(c) The applicant must construct and arrange each powerplant installation to account for:
(1) all likely operating conditions, including foreign object threats;
(2) sufficient clearance of moving parts to other aeroplane parts and their surroundings;
(3) likely hazards in operation, including hazards to ground personnel; and
(4) vibration and fatigue.
(d) Hazardous accumulations of fluids, vapours or gases are isolated from the aeroplane and personnel compartments and are safely contained or discharged.
(e) Installations of powerplant components that deviate from the component limitations or installation instructions must be shown to be safe.
(f) For the purposes of this Subpart, ‘energy’ means any type of energy for the powerplant, including, for example, fuels of any kind or electric current.
ED Decision 2017/013/R · Source