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Powerplant -14 CFR Part 23 Subpart E



14 Code of Federal Regulations Part 23 Subpart E sets forth the airworthiness standards for the powerplant installation of normal category airplanes. This subpart covers the installation of the engine(s), propeller(s), and associated components, as well as the fuel system, induction system, and exhaust system.


The purpose of Subpart E is to ensure that the powerplant installation is safe and reliable. The requirements of this subpart are designed to prevent hazards that could arise from engine failure, fire, or fuel leaks.

Some of the key requirements of Subpart E include:

  • The engine(s) must be installed in such a way that they cannot be accidentally damaged during normal operation.

  • The propeller(s) must be properly balanced and must not create excessive vibration.

  • The fuel system must be designed to prevent fuel leaks and to provide adequate fuel supply for all operating conditions.

  • The induction system must be designed to prevent the ingestion of foreign objects and to provide adequate airflow to the engine(s).

  • The exhaust system must be designed to prevent the escape of hot gases and to minimize noise.

In addition to these specific requirements, Subpart E also includes general requirements for the installation of powerplant components. These requirements cover such things as the installation of controls, instruments, and markings.

The requirements of Subpart E are essential for the safe operation of normal category airplanes. By ensuring that the powerplant installation is properly designed and installed, these requirements help to prevent accidents and injuries.


The requirements of Subpart E are based on the experience of the Federal Aviation Administration (FAA) and on the recommendations of industry experts. These requirements have been developed over many years to ensure that the powerplant installation of normal category airplanes is safe and reliable.

The requirements of Subpart E are constantly being reviewed and updated to reflect new technologies and safety concerns. For example, the FAA recently updated the requirements for fuel systems to address the potential for fuel tank fires.

The requirements of Subpart E are an important part of the overall safety of normal category airplanes. By ensuring that the powerplant installation is properly designed and installed, these requirements help to prevent accidents and injuries.


In conclusion, the part 23 subpart E is critical in the overall airplane safety. At Prime Propulsion we have years of experience with powerplant integration, if you need any assistance with anything related to powerplant or fuel systems, please do not hesitate to contact us. We have DER on staff ready to assist with your PMA, STC, and TC projects.


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