071-01052-0000 - Textron Aviation OEM Flux Valve KMT-112

071-01052-0000 – Honeywell KMT-112 Solid-State Magnetometer

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The Honeywell 071-01052-0000, model KMT-112, is the current production standard for the flight-critical magnetic azimuth transmitter used in numerous advanced avionics suites, including those installed on many Textron Aviation aircraft. It is essential for technicians and procurement specialists to note that while this component fulfills the role of older-style "flux valves" or "flux gates," it is a technologically superior, solid-state magnetometer. The KMT-112 uses no moving parts, representing a significant advancement in reliability and accuracy for generating magnetic heading data.

Manufactured by Honeywell Aerospace and integrated by airframe OEMs like Textron Aviation, this sensor's function is to provide precise measurements of the Earth's magnetic field to the Attitude and Heading Reference System (AHRS) or compass computer. This data is the foundation for the aircraft's entire heading reference, impacting everything from the pilot's primary display to the autopilot's navigation tracking. This part number is the direct replacement for the legacy part number 071-1052-00.

Key Features

• Solid-State AMR Technology: Employs advanced Anisotropic Magnetoresistive (AMR) sensors, completely replacing failure-prone mechanical components of legacy flux valves.

• No Moving Parts: The solid-state design eliminates wear, drift, and the potential for mechanical failure, dramatically increasing reliability and eliminating the need for periodic overhaul.

• High Accuracy and Stability: Provides precise and stable magnetic vector data, enabling the AHRS to calculate a smooth and accurate heading presentation free from the oscillations of older systems.

• Lightweight, Non-Ferrous Housing: Housed in a compact, sealed polymer enclosure that is electromagnetically transparent, ensuring the integrity of the magnetic field measurement.

• OEM System Integration: Engineered for seamless, certified integration with Honeywell Bendix/King systems, including the KCS 55A compass system and the KFC 225, KFC 275, and KFC 325 flight control systems.

Technical Specifications

• Part Number: 071-01052-0000

• Supersedes: 071-1052-00

• Component Type: Solid-State Magnetometer / Magnetic Azimuth Transmitter

• Manufacturer: Honeywell Aerospace

• Primary Airframe Integrator: Textron Aviation, among other OEMs.

• Model: KMT-112

• Sensor Technology: Anisotropic Magnetoresistive (AMR)

• Output: Provides analog sine/cosine voltage signals corresponding to the X and Y components of the local magnetic field.

• Governing Specifications: Manufactured and certified to meet the requirements of applicable FAA TSO standards for magnetic heading instruments and navigation equipment.

Aircraft Compatibility

The 071-01052-0000 is the specified magnetometer for a wide range of high-performance aircraft equipped with compatible Honeywell Bendix/King avionics. It is a common component on numerous Textron Aviation platforms, including but not limited to:

• Textron Aviation (Cessna): 210, 340, 414, 421 series, and various Citation models.

• Textron Aviation (Beechcraft): Bonanza (A36, G36), Baron (58, G58), and King Air (90, 200, 300) series.

• Other platforms from manufacturers like Piper (PA-46 series) and Pilatus (PC-12) with compatible avionics.

Crucial Note: Verification against the specific aircraft's current Illustrated Parts Catalog (IPC) and avionics equipment list is mandatory to ensure correct part number applicability.

Applications

The sole function of the KMT-112 is to serve as the primary magnetic sensing unit for the aircraft's heading reference system. It is the foundational sensor for:

• Primary Heading Indication: Drives the magnetic heading displayed to the pilot on the HSI/EHSI.

• Autopilot Control: Provides the heading reference for all autopilot modes, including HDG (Heading Hold), NAV (Navigation Track), and APR (Approach).

• Flight Director Command: Supplies heading data used by the flight director to compute steering commands.

Why Choose 071-01052-0000?

Choosing the genuine Honeywell 071-01052-0000 provides the certified reliability of modern solid-state technology. Unlike older flux valves, the KMT-112 has no moving gimbals or pendulous components to wear out or fail, ensuring long-term performance without the need for costly overhauls. As the OEM-specified component, it guarantees perfect data compatibility with the flight computer, which is essential for accurate navigation and safe, predictable autopilot performance. Installing this part ensures you are using the latest, most reliable technology certified for the aircraft.

The KMT-112's operation is based on the anisotropic magnetoresistance (AMR) effect observed in specific ferromagnetic thin films, such as permalloy (a nickel-iron alloy). The sensor's permalloy element is deposited on a silicon substrate as a resistive strip. Due to its crystalline anisotropy, the material's internal magnetization vector has a preferred "easy axis." The sensor's resistance is a function of the angle (θ) between the direction of the sensing current and this internal magnetization vector. An external magnetic field (i.e., the Earth's magnetic field) applied to the sensor causes a rotation of the magnetization vector, changing the angle θ and thus changing the sensor's bulk resistance. This minute change in resistance is measured with extreme precision by an integrated Wheatstone bridge circuit. The KMT-112 contains two such AMR sensor bridges oriented orthogonally to one another, allowing it to resolve the local magnetic field into its X and Y vector components, which are then transmitted as sine/cosine analog voltages to the AHRS for processing.

Note: This is a flight-critical navigation sensor. Its installation location, typically in a wingtip or the vertical stabilizer, is strategically chosen to be as far as possible from the aircraft's sources of magnetic interference (ferrous metals and DC electrical currents). Following installation, a full magnetic compass calibration procedure ("compass swing") must be performed by a certified avionics technician in accordance with the manufacturer's maintenance manual to correct for residual deviation and ensure heading accuracy.

Documentation

All technical data, installation procedures, and calibration requirements must be sourced from the applicable Honeywell Bendix/King system installation and maintenance manuals (e.g., KCS 55A Compass System, KFC 225 Autopilot, etc.).