9200-38100-0101 - L3Harris GH-3900 Remote Sensing Unit With Accelerometer

9200-38100-0101 – L3Harris GH-3900 Remote Sensing Unit (RSU) with Accelerometer

Available now through the AirParts Aero marketplace.

Overview Section

The L3Harris 9200-38100-0101 is a sophisticated Remote Sensing Unit (RSU) specifically engineered for the GH-3900 ESIS (Electronic Standby Instrument System). This high-precision sensor module provides the critical inertial and aerodynamic data required for the cockpit standby displays to function independently of the aircraft's primary ADI (Attitude Direction Indicator) and Air Data computers.

Equipped with an integrated multi-axis Accelerometer and solid-state gyroscopic sensors, the 9200-38100-0101 monitors the aircraft’s pitch, roll, and acceleration forces in real-time. By mounting the RSU remotely—typically near the aircraft's center of gravity—it ensures that the standby instruments receive the most accurate motion data possible, free from the mechanical vibrations and parallax errors often found in panel-mounted legacy gyros.

Key Features Section

• Solid-State Reliability: Utilizes MEMS (Micro-Electro-Mechanical Systems) technology, eliminating the spinning mass and mechanical wear associated with traditional vacuum or electric gyros.

• Integrated Accelerometer: Features high-sensitivity G-load sensing that contributes to precise attitude calculations, particularly during high-dynamic maneuvers or turbulence.

• Dual Air Data Inputs: Includes precision ports for Pitot and Static pressure, allowing the unit to calculate Standby Airspeed, Altitude, and Vertical Speed.

• Digital ARINC 429 Interface: Streams high-speed digital data directly to the GH-3900 display unit, ensuring a low-latency, "jitter-free" pilot interface.

• Remote Mount Versatility: Its compact, ruggedized housing allows for installation in remote avionics bays, optimizing space behind the instrument panel.

• MIL-SPEC Environmental Hardening: Designed to operate across extreme temperature ranges and altitudes, fully compliant with RTCA DO-160 standards.

Technical Specifications Section

Aircraft Compatibility Section

The 9200-38100-0101 is found in the emergency avionics suites of high-performance airframes across the AirParts Aero network:

• Business Jets: Standard standby equipment for Gulfstream G-series, Bombardier Global/Challenger, and Dassault Falcon aircraft.

• Regional Transports: Utilized in ATR 42/72 and Embraer ERJ fleets for enhanced flight deck safety.

• Military Derivatives: Found on specialized surveillance and transport variants of civil airframes.

• Retrofit Glass Cockpits: A popular choice for PART 25 aircraft undergoing legacy-to-digital standby transitions.

Technical Applications & Safety

The RSU acts as the "brains" behind the standby display. In the event of a total primary power failure or an AHRS (Attitude and Heading Reference System) malfunction, the 9200-38100-0101 provides the redundant data stream that keeps the pilot oriented. Because the unit contains its own pressure transducers and accelerometers, it effectively creates a "third source" of truth on the flight deck, which is critical for solving "disagree" alerts between the Pilot and Co-pilot primary displays.

The engineering sophistication of the 9200-38100-0101 is rooted in its Inertial Correction Algorithms. Standby instruments often suffer from "precession" or "attitude lag" during sustained turns. The integrated accelerometer in this RSU works in tandem with the MEMS gyros to perform real-time Centripetal Acceleration Compensation. This ensures that the pitch and roll information remains "erect" and accurate even during long-duration orbits or steep banking maneuvers.

Furthermore, the unit features internal Heated Pressure Transducers. Unlike lower-tier sensors that can drift as cabin temperatures change, the 9200-38100-0101 maintains a stable thermal environment for its silicon sensors, ensuring that your "Standby Altitude" remains precise from sea level up to 55,000 feet. Choosing this L3Harris unit through AirParts Aero guarantees the high MTBF (Mean Time Between Failures) required for aircraft operating in RVSM (Reduced Vertical Separation Minimum) airspace.

Installation & Maintenance Addendum

1. Alignment: The RSU must be mounted perfectly level and aligned with the aircraft's longitudinal axis. Use a precision digital level during installation.

2. Pitot-Static Integrity: After installation, a full Pitot-Static leak check per FAR 91.411 must be performed to ensure the integrity of the remote pneumatic connections.

3. Software Configuration: Ensure the RSU software version is compatible with the GH-3900 display unit as specified in the L3Harris Master Drawing List.

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L3Harris GH-3900 Companion Components & Integration

To ensure the full operational capability of the 9200-38100-0101 Remote Sensing Unit (RSU), it must be integrated with the appropriate display hardware and installation accessories. Below are the primary companion items commonly managed through the AirParts Aero inventory.

1. Primary Display Unit: L3Harris DU-42

The RSU does not have a user interface; it streams processed data to the DU-42 Display Unit. This high-resolution, landscape-oriented screen is the pilot-facing component of the GH-3900RSU system.

• Part Number: 9200-38600-0201 (Standard DU-42)

• Alternative Configurations: Various dash numbers exist for NVIS (Night Vision Imaging System) compatibility or specific bezel finishes.

• Key Specs: 4.2-inch diagonal color LCD, sunlight-readable, only 1.5 inches deep.

• Interface: Receives ARINC 429 data directly from the 9200-38100-0101 RSU.

2. GH-3900.2 Installation & Mounting Kit

A secure mechanical and electrical interface is mandatory for the RSU to maintain its sensing accuracy. The installation kit provides the standardized hardware for airframe integration.

• Part Number: 9060-34000-01 (Standard Installation Kit)

• Kit Contents: * Remote Mounting Tray: Specifically designed to house the RSU in an avionics bay or near the center of gravity.

  • Backshell Assembly: Typically a straight backshell for the high-density D-sub connectors.

  • Configuration Module: A small, programmable module within the harness that stores aircraft-specific settings (V-speeds, SSEC, and orientation).

• Purpose: Ensures the RSU is electrically bonded to the airframe and isolated from excessive structural vibration.

3. GH-3900 ESIS Alternatives (Internal Sensors)

For aircraft with sufficient space behind the instrument panel, L3Harris offers "all-in-one" units that do not require a remote RSU. If your mission profile changes, these are the primary cross-referenced systems:

• 9200-34400-0401: GH-3900.2 Electronic Standby Indicator (Internal sensors, no remote RSU required).

• 9200-34600-0101: GH-3900.2 with Attitude, Air Data, and Internal Accelerometers.

Technical Integration Summary

Website Metadata & SEO Addendum

• Meta Title: L3Harris GH-3900 System Components | AirParts Aero

• Meta Description: Complete your GH-3900 ESIS installation with the DU-42 Display Unit and 9060-34000-01 Install Kit. Available through AirParts Aero.

• SEO Keywords: GH-3900 installation kit, DU-42 display unit, 9200-38600-0201, 9060-34000-01, L3Harris standby instrument parts, AirParts Aero, ESIS mounting tray.

SEO-Enhanced Addendum: System Architecture Insight

The GH-3900RSU architecture is unique because it separates the Inertial Measurement Unit (IMU) from the display. By utilizing the 9200-38100-0101 RSU, avionics engineers can place the sensors at the aircraft's Optimal Sensing Node (the point of least vibration and rotation lag). The data is then digitally packetized and sent via ARINC 429 to the DU-42 Display. This "split" design is what allows the GH-3900 to be the thinnest standby display on the market, as the bulky pressure transducers and gyros are housed in the remote RSU rather than the dashboard.