MHB2399S Armature is a replacement motor armature designed for use in compatible aircraft starter motors. As the rotating electromagnetic component of the starter motor, the armature converts electrical energy into mechanical torque required to crank the aircraft engine during the starting sequence.

Manufactured for aviation starter applications, the armature consists of a precision-machined laminated steel core, wound copper conductors, shaft, and commutator assembly. Working in conjunction with the starter field coils and brushes, it generates the rotational force necessary to engage the starter drive and rotate the engine until combustion is established.

The MHB2399S armature is commonly used in compatible MHB series aircraft starter motors installed on various general aviation aircraft and engine applications. Precision balancing and accurate machining help ensure smooth operation, efficient power transfer, and dependable starter performance while minimizing vibration and mechanical wear.

During starter overhaul or maintenance, the armature should be inspected for bearing surface wear, commutator condition, shaft straightness, insulation integrity, and winding continuity. Replacing a worn or damaged armature helps restore starter efficiency, improve engine starting reliability, and extend the service life of the complete starter assembly.

Key Features

- Part Number: MHB2399S
- Manufacturer: Kelly Aerospace Energy Systems / Hartzell Engine Technologies
- Component: Aircraft Starter Motor Armature
- Rotating electromagnetic assembly for aircraft starter motors
- Precision-balanced laminated steel core with copper windings
- Integral commutator for efficient electrical power transfer
- Designed for compatible MHB series starter motors
- Supports reliable engine starting and starter motor overhaul applications