Propeller Certification and Airworthiness Standards

Propellers play a critical role in aircraft performance, safety, and efficiency. The FAA provides detailed guidance on propeller design, certification, and maintenance to ensure compliance with regulatory standards. The following advisory circulars (ACs) cover key aspects of propeller certification and operational safety.

General Propeller Maintenance and Inspection

These advisory circulars provide guidelines for the safe operation, maintenance, and inspection of aircraft propellers.

AC 20-37E Ed Update - Link
This advisory circular provides updated guidelines for the installation, maintenance, and repair of aircraft propellers. It includes recommendations for routine inspections and troubleshooting techniques to maintain operational integrity.

AC 20-66B - Link
This circular covers the procedures for handling and maintaining metal propellers, including damage assessment and corrosion control. It provides detailed maintenance recommendations to enhance propeller longevity and airworthiness.

Propeller Certification Standards

These ACs establish certification requirements for propeller strength, durability, and safety.

AC 35.4-1 - Link
This document outlines the FAA’s requirements for propeller certification testing. It ensures compliance with performance and safety benchmarks, including endurance testing, material integrity, and aerodynamic performance.

AC 35.23-1 - Link
This circular provides guidance on the operational limitations and control systems of aircraft propellers. It focuses on performance evaluation, control responsiveness, and failure mitigation strategies.

AC 35.16-1 - Link
This advisory circular defines safety and reliability standards for propeller fatigue life. It ensures that propeller materials and components can withstand repetitive operational stresses over extended use without failure.