071-1052-00 - Honeywell Aerospace OEM Magnetic Azimuth Transmitter Model KMT-112 Replaced by 071-01052-0000

071-1052-00 (Replaced by 071-01052-0000) – Honeywell KMT-112 Magnetic Azimuth Transmitter

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The Honeywell 071-1052-00, model KMT-112, is a flight-critical, solid-state magnetic azimuth transmitter that serves as the primary magnetic field sensor for a variety of Honeywell Bendix/King avionics systems. Note to operators and technicians: This part number 071-1052-00 has been superseded by the manufacturer to part number 071-01052-0000. The new part is a direct, form-fit-function replacement. This component is engineered to provide precise, real-time measurements of the Earth's magnetic field vector, delivering the raw data necessary for the flight computer to calculate the aircraft's magnetic heading.

Utilizing Anisotropic Magnetoresistive (AMR) sensor technology, the KMT-112 operates with no moving parts, offering an exceptional level of reliability and stability compared to legacy flux valves. The data it provides is fundamental to the aircraft's navigation and autopilot systems, directly influencing the accuracy of the Horizontal Situation Indicator (HSI) display and the performance of autopilot functions such as heading-hold and navigation tracking.

Key Features

• Solid-State AMR Sensor Technology: Employs advanced Anisotropic Magnetoresistive sensors for highly sensitive and stable detection of the terrestrial magnetic field.

• No Moving Parts: The solid-state design eliminates the wear, drift, and potential for mechanical failure inherent in traditional flux gate compass systems, dramatically increasing reliability.

• High Accuracy and Resolution: Provides precise magnetic vector data, enabling the AHRS or compass computer to calculate a smooth and accurate heading presentation.

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

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

Technical Specifications

• Part Number: 071-1052-00

• Superseded By: 071-01052-0000

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

• OEM Manufacturer: Honeywell Aerospace

• 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.

• System Integration: Provides heading reference data source for systems such as the Honeywell Bendix/King KCS 55A Compass System, KI-525A HSI, and various AHRS units.

• Housing Material: Specification should be confirmed via OEM documentation, but is a non-ferrous, sealed polymer/composite material.

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

Aircraft Compatibility

The KMT-112 transmitter (both original and superseding part numbers) is a key component in Honeywell Bendix/King avionics packages commonly installed in a wide range of high-performance general aviation aircraft. It is frequently found on, but not limited to, the following models:

• Beechcraft: Bonanza (A36, G36), Baron (58, G58) series

• Piper: PA-46 series (Malibu, Mirage, Meridian)

• Cessna: 210, 340, 414, 421 series

• Pilatus: PC-12 (certain legacy avionics configurations)

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 and installation eligibility. Always reference the latest revision of the IPC to confirm the current part number.

Applications

The sole function of this component 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?

While your maintenance documents may reference the legacy 071-1052-00 part number, ordering the current 071-01052-0000 ensures you receive the latest production revision from Honeywell. The magnetic heading is a fundamental parameter for safe navigation. Using the OEM-certified component is the only way to guarantee the precise, reliable data that its corresponding flight computers are designed to process. This ensures the calibrated performance, data integrity, and system compatibility required for safe flight operations.

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.).