This propeller configuration is commonly associated with Piper Navajo series aircraft installations, including left-engine applications where a counter-rotating propeller arrangement is used. The LH designation identifies the propeller’s direction of rotation when viewed from the pilot’s perspective, ensuring correct thrust direction and compatibility with the aircraft engine and gearbox configuration. The propeller is designed to operate with approved hydraulic governors and engine systems specified by the aircraft type certificate.

The 3AF32C508/82NFA-6 is engineered to deliver reliable aerodynamic performance while handling the demanding conditions experienced during takeoff, climb, cruise, and repeated flight cycles. Its constant-speed design allows the propeller blade angle to adjust automatically through the governor system, maintaining efficient engine RPM and improving aircraft performance across different flight conditions.

Key Features
Manufacturer: McCauley Propeller Systems
Part Number: 3AF32C508/82NFA-6
Description: LH Constant-Speed Propeller Assembly
Propeller Type: Three-blade constant-speed propeller
Hub Model: 3AF32C508
Blade Model: 82NFA-6
Rotation: Left-Hand (LH)
Construction: Aluminum alloy hub and aircraft-grade propeller blades
Control Type: Hydraulic constant-speed operation
Application: Certified twin-engine aircraft installations
Primary Function: Converts engine power into aerodynamic thrust while maintaining efficient engine operating RPM
Certification: FAA-approved propeller configuration for applicable aircraft installations

Design & Performance Features
Three-blade configuration provides smooth operation and reduced vibration compared with many two-blade designs
Constant-speed capability improves engine efficiency during takeoff, climb, and cruise conditions
Precision blade geometry provides optimized aerodynamic performance
Designed for durability under high rotational loads and repeated flight cycles
Compatible with approved propeller governor systems for automatic pitch control
Supports aircraft maintenance, overhaul, and replacement requirements
Typical Applications
Piper PA-31 Navajo series aircraft
Twin-engine aircraft requiring LH McCauley 3AF32C508 hub configuration
Aircraft equipped with approved McCauley constant-speed propeller installations
Propeller replacement and overhaul programs

Specifications
Propeller Manufacturer: McCauley Propeller Systems
Hub Model: 3AF32C508
Blade Model: 82NFA-6
Blade Count: 3
Rotation: LH
Diameter: Approximately 76 in maximum (application dependent)
Propeller Configuration: Constant-speed, hydraulic controlled
Unit of Measure: Each

Benefits
Provides reliable thrust and efficient aircraft performance
Enhances engine performance through constant-speed operation
Reduces pilot workload by automatically maintaining selected RPM
Designed for long service life in demanding aviation environments
Supports certified aircraft maintenance and overhaul requirements