The Prestolite EBB131A is a Bendix-type starter drive assembly used in aircraft starter systems to transmit torque from the starter motor to the engine’s ring gear during engine start.

It operates using a mechanical overrun and engagement mechanism, where the drive gear engages the engine flywheel during cranking and automatically disengages once the engine starts and overruns the starter speed. This prevents damage to the starter motor and ensures smooth starting operation.

The unit is commonly used in general aviation starter systems (Textron / Lycoming / Continental applications depending on installation) and is designed as a direct replacement component for compatible Prestolite starter assemblies.

The Bendix mechanism uses helical splines and a spring-loaded drive pinion, allowing axial movement for engagement and automatic disengagement based on rotational speed differences between the starter and engine.

Key features include:

Prestolite part number: EBB131A
Bendix-type starter drive assembly
Mechanical engagement via helical spline system
Automatic overrun disengagement protection
Transfers torque from starter motor to engine ring gear
Designed for aircraft piston engine starting systems
Compatible with Prestolite/Textron starter assemblies
High-strength steel gear and drive components
Spring-loaded pinion engagement mechanism
Prevents back-drive damage after engine start
Used in general aviation starter systems
Precision-machined aviation-grade drive assembly