23093-1307 - Textron Aviation OEM Starter Generator Brush

23093-1307 – Textron Aviation OEM Starter-Generator Brush (Safran 23091-009)

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Overview

The 23093-1307 is the genuine Textron Aviation Original Equipment Manufacturer (OEM) brush for the Safran Power Systems model 23091-009 starter-generator. This is a flight-critical component primarily used on the Williams and Pratt & Whitney Canada turbofan engines that power the Cessna Citation family of business jets. The brush serves a demanding dual function: in starter mode, it conducts the extremely high amperage required to motor the engine's high-pressure spool for starting, and in generator mode, it collects the generated DC electrical power from the armature to supply the aircraft bus.

This component is an advanced metal-graphite composite, specifically formulated to handle the unique electrical loads and operating environment of a jet engine starter-generator. As the OEM-certified part, the 23093-1307 guarantees the correct material composition, dimensions, and performance characteristics required to ensure reliable engine starts, stable power generation, and to protect the expensive commutator from premature wear or damage.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring airworthiness and correct performance for the Citation fleet.

• High-Conductivity Metal-Graphite: Fabricated from a specialized composite of carbon, graphite, and copper powder, designed to handle the extreme current densities of turbofan engine starting.

• For Safran 23091-009 Starter-Generators: Engineered specifically as the correct replacement brush for this widely used starter-generator model found on numerous business jets.

• Integral Copper Shunt Wire: Features a securely embedded braided copper "pigtail" to provide a low-resistance path for current, protecting the brush springs from overheating and loss of tension.

• Critical Wear Component: Designed as a consumable part that wears predictably over time, acting as a sacrificial element to protect the far more expensive commutator surface.

• Optimized for Jet Applications: The material compound is formulated for the specific rotational speeds, temperatures, and current profiles of turbofan engine starter-generators.

Technical Specifications

• Part Number: 23093-1307

• Component Type: Starter-Generator Brush

• OEM Authority: Textron Aviation

• Underlying Manufacturer: Safran Power Systems

• For Use In: Safran Power Systems Starter-Generator P/N 23091-009 and other specified models.

• Engine Application (Typical): Williams International FJ44 series; Pratt & Whitney Canada PW500 series.

• Material: Metal-Graphite Composite

• Governing Specification: Textron Aviation / Safran Power Systems Engineering Drawings.

Aircraft Compatibility

This brush is the specified component for the starter-generators installed on a wide range of Cessna Citation business jets.

• Primary Textron Aviation Platforms:

  • Cessna CitationJet (CJ, CJ1, CJ2, CJ3, CJ4)

  • Cessna Citation V, Ultra, Encore

  • Cessna Citation Bravo

  • Cessna Citation M2

Note: Verification of applicability is the absolute responsibility of the installer. The aircraft or engine's current Illustrated Parts Catalog (IPC) is the final authority for confirming part number eligibility.

Applications

• Engine Starting: Conducts high DC current to the armature to motorize the engine's high-pressure spool (N2) for ground and in-flight starts.

• Power Generation: Collects DC current from the armature to supply the aircraft's 28VDC electrical bus after engine start.

Why Choose 23093-1307?

The brush in a starter-generator is a precisely engineered component, not a generic block of carbon. Its material compound is matched to the specific alloy of the commutator, the brush spring pressure, and the extreme electrical loads of its application. Using the genuine OEM 23093-1307 brush is the only way to ensure reliable performance and prevent destructive arcing that can severely damage the commutator bars, leading to costly overhaul or replacement of the entire starter-generator. This OEM part is a critical investment in the health and reliability of an essential engine component.

The electro-mechanical function of the 23093-1307 brush is critical to the process of commutation in a DC machine. As the armature rotates, the brushes must slide from one copper commutator segment to the next, reversing the direction of current flow in the corresponding armature winding at the precise moment it passes through the magnetic neutral plane. The width and material of the brush are engineered to briefly short-circuit the two segments during this transition. A brush made of an incorrect compound can have the wrong resistance, leading to a destructive, high-current arc as the short is broken. This plasma arc vaporizes the copper of the commutator bars, leading to pitting, scoring, and eventual failure. The specified 23093-1307 brush has the exact resistivity, shape, and low-friction characteristics to ensure this transition occurs smoothly (or "sparklessly"), preserving the commutator surface and ensuring the efficient conversion of electrical to mechanical energy (and vice-versa).

Note: This is a flight-critical, on-condition, or time-limited wear item. Brushes should always be replaced as a complete set. Installation must be performed by a certified A&P mechanic in strict accordance with the starter-generator's Component Maintenance Manual (CMM). During replacement, the commutator must be inspected for wear and cleanliness, and the brush holder assembly must be checked for proper function. Brush seating procedures may be required to ensure proper fitment.

Documentation

All technical data, installation procedures, and service limits for this component are proprietary to Safran Power Systems and Textron Aviation. This information is contained within the official Component Maintenance Manual (CMM) for the 23091-009 starter-generator.