B100143-1 – Textron Aviation OEM Propeller De-Ice Slip Ring Assembly
Available now on the Airparts.aero Marketplace.
Overview
The Textron Aviation B100143-1 is a flight-critical, genuine Original Equipment Manufacturer (OEM) slip ring assembly, engineered as the core component for the propeller de-ice system on Beechcraft King Air series aircraft. This is a highly specialized electromechanical device whose sole function is to transfer electrical current from a stationary source on the engine nacelle to the rotating de-ice boots mounted on the propeller blades. Its reliable operation is absolutely essential for Flight Into Known Icing (FIKI) conditions.
Mounted on the engine nose case and rotating with the propeller, the B100143-1 consists of multiple, concentric conductive rings precision-machined from a high-conductivity copper alloy. These rings are separated and insulated by a high-dielectric strength material. Stationary carbon brushes ride on these rotating rings, creating a continuous electrical circuit. A failure of this component renders the propeller de-ice system inoperative, which can lead to catastrophic ice buildup, severe propeller imbalance, and loss of thrust.
Key Features
Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct fit, material composition, and performance.
Enables Propeller De-Ice Function: A primary, flight-critical component that transmits power to the propeller's electrical heating elements.
High-Conductivity Commutator Rings: Manufactured from a specific copper alloy chosen for its excellent electrical conductivity and wear characteristics when paired with carbon brushes.
High-Dielectric Strength Insulation: The conductive rings are separated by a robust insulating material to prevent arcing and short circuits in the high-vibration, moisture-prone propeller environment.
Designed for Continuous Rotational Contact: Precision-machined with a fine surface finish to ensure constant, low-resistance contact with the carbon brushes at all propeller RPMs.
Flight-Critical for FIKI Operations: The integrity of the entire Flight Into Known Icing system is dependent on the performance of this component.
Technical Specifications
Part Number: B100143-1
Component Type: Propeller De-Ice Slip Ring Assembly
OEM Authority: Textron Aviation (Beechcraft)
Underlying Manufacturer (Typical): Goodrich / Collins Aerospace
Application: Propeller De-Ice System
Material (Rings): Per OEM specification, typically a high-purity copper alloy. (Must be confirmed by OEM documentation).
Material (Insulator): Per OEM specification, typically a high-temperature thermoset plastic or composite material.
Governing Specification: Textron Aviation Engineering Drawing B100143.
Aircraft Compatibility
This OEM slip ring assembly is the standard component for the propeller de-ice systems on the world's most popular family of turboprop aircraft.
Primary Textron Aviation Platforms:
Beechcraft King Air 200 Series (200, B200, B200GT)
Beechcraft King Air 300/350 Series
Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final authority for confirming part number eligibility.
Applications
Sole Application: To transfer electrical current from the stationary carbon brush block assembly on the engine to the rotating electrical heating elements (de-ice boots) on the propeller blades.
Why Choose B100143-1?
In-flight icing is one of the most hazardous conditions a turboprop aircraft can face. The failure of a propeller de-ice system can lead to asymmetric ice shedding, causing violent, engine-damaging vibration, or a uniform buildup that severely degrades propeller efficiency and thrust. The genuine Textron OEM B100143-1 is the only part guaranteed to have the correct material pairing for the carbon brushes, ensuring both optimal electrical conductivity and a predictable service life. A non-certified part could use an incorrect alloy, leading to high electrical resistance (overheating and poor performance) or accelerated, galling wear of the rings and brushes, resulting in premature system failure when it is needed most.
The B100143-1 is an exemplar of tribological engineering in an electromechanical system. The interface between the rotating copper alloy rings and the stationary carbon-graphite brushes is a precisely managed wear surface. The material pairing is not arbitrary; it is designed to facilitate the formation of a stable, microscopic conductive film, or patina, on the surface of the copper rings. This patina is a complex layer of graphite, copper oxides, and adsorbed atmospheric moisture that acts as a solid-film lubricant. Its formation is critical, as it drastically reduces both the coefficient of friction and the rate of mechanical wear on both the ring and the brushes. Simultaneously, this patina provides a consistent, low-resistance electrical path. The entire system is engineered to operate in a state of controlled, minimal wear, where the integrity of this patina is the key to maintaining a continuous electrical circuit to a component rotating at up to 2,200 RPM in a harsh operational environment.
Note: This is a flight-critical component for aircraft certified for Flight Into Known Icing (FIKI). It is a wear item and must be inspected at regular intervals in accordance with the aircraft maintenance manual for signs of excessive grooving, arcing, or contamination. Installation must be performed by a certified A&P mechanic. The ring surfaces must be kept perfectly clean and free of any oils or grease, as contamination will prevent the proper formation of the conductive patina and lead to rapid wear and poor electrical performance.
Documentation
All technical data, installation procedures, and wear limits for the B100143-1 slip ring are proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Illustrated Parts Catalog for the applicable Beechcraft King Air model. No public-facing documentation is available.