NH1000897-40 - Textron Aviation OEM Overboard Clamp

NH1000897-40 – Textron Aviation OEM Overboard Clamp

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Overview

The Textron Aviation NH1000897-40 is a genuine OEM, flight-critical overboard clamp, a primary structural component engineered for securing drain and vent lines on the Beechcraft King Air series of aircraft. This is not a standard hardware clamp; it is a precision-machined, multi-port structural fairing and clamp assembly designed to securely hold multiple drain lines as they exit the fuselage. Fabricated from a high-strength aluminum alloy, the NH1000897-40 provides a robust, aerodynamic, and corrosion-resistant interface between the aircraft's fluid lines and the external airframe, ensuring the safe and proper venting of fluids and fumes overboard.

This component's integrity is essential for preventing the ingress of water and contaminants into the fuselage and for protecting the delicate drain lines from aerodynamic loads and vibration. As a genuine Textron OEM part, it guarantees the precise fit and material strength required for this critical structural application.

Key Features

• Primary Structural Support: Serves as the main structural anchor point for multiple drain and vent lines, including those for the fuel system and environmental controls. It is designed to withstand the aerodynamic forces exerted on the protruding lines during flight.

• Aerodynamic Fairing: The clamp is shaped to act as a fairing, providing a smooth, aerodynamic transition between the drain lines and the aircraft's skin. This minimizes parasitic drag and prevents the generation of aerodynamic noise.

• High-Strength Aluminum Alloy: Machined from a solid billet of high-grade, aerospace aluminum alloy. This provides the necessary strength to secure the lines without fatiguing, while remaining lightweight and offering excellent corrosion resistance.

• Multi-Port Design: Features multiple, precisely located and sized holes to accommodate the various drain masts and vent tubes that must exit the aircraft in a specific, controlled area.

• Corrosion Protection: The finished part is treated with a chemical conversion coating (Alodine) and/or a high-performance primer. This provides a robust, multi-layer defense against corrosion, ensuring the long-term structural integrity of the clamp and the surrounding fuselage.

Technical Specifications

• Part Number: NH1000897-40

• Component Type: Overboard Drain & Vent Line Clamp / Fairing

• Material: High-Strength Aluminum Alloy

• Finish: Primed and/or Chemical Conversion Coated

• Primary Function: Secures and provides an aerodynamic fairing for multiple overboard drain lines.

• Inspection: Subject to Non-Destructive Testing (NDT) requirements for structural integrity.

• Certification: FAA Production Approval

Aircraft Compatibility

The NH1000897-40 is the specified OEM overboard clamp for a wide range of the legendary Beechcraft King Air family. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.

• Primary Aircraft Models:

  • Beechcraft King Air: 90, 100, 200 Series

Applications

The NH1000897-40 is a flight-critical component essential for the integrity of multiple aircraft systems:

• Fluid System Venting: Provides a secure exit point for fuel tank vents, battery vents, and other system drain lines.

• Airframe Structural Repair: The specified replacement part when the original clamp is found to be cracked, corroded, or damaged.

• Maintaining Aerodynamic Cleanliness: Essential for reducing drag and ensuring the smooth flow of air over the fuselage.

Why Choose NH1000897-40?

The failure of an overboard clamp can lead to serious consequences. A loose or detached drain line can vibrate under aerodynamic loads, leading to fatigue failure and a potential fuel leak. It can also allow water and de-icing fluids to be forced into the fuselage, leading to hidden corrosion. Using a genuine Textron Aviation NH1000897-40 is the only way to ensure the part has the certified material strength and precise dimensions for a stress-free, airworthy fit. For a component this critical to both systems and structural integrity, there is no substitute.SEO-Enhanced Addendum

The NH1000897-40 is an engineered solution that addresses both structural and aerodynamic requirements. Structurally, it acts as a load-distributing plate. The fasteners that secure it to the fuselage skin spread the aerodynamic loads from the protruding drain masts over a wide area, preventing stress concentrations on the skin. Aerodynamically, the area where a tube protrudes from a flat surface creates significant interference drag. The NH1000897-40's faired shape is designed to guide the airflow smoothly around the base of the tubes, minimizing the formation of turbulent vortices. This small but carefully designed feature helps to reduce the aircraft's overall parasitic drag, contributing to its fuel efficiency and performance.

Note: This is a primary airframe structural component. Installation must be performed by a certified A&P mechanic with experience in airframe structures, in strict accordance with the current Textron Aviation (Beechcraft) maintenance and structural repair manuals. Proper sealing of the clamp to the fuselage skin is essential to prevent moisture intrusion.