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LA129-430041-1 – Lee Aerospace FAA-PMA Laminated Cabin Window for Beech 1900
Available now on the Airparts.aero Marketplace.
Overview
The Lee Aerospace LA129-430041-1 is a premium, FAA-PMA approved, laminated and formed cabin window engineered as a direct replacement for the Textron/Beechcraft OEM part number 129-430041-1. This flight-critical component is designed for the Beechcraft 1900 series, a pressurized, high-altitude turboprop airliner. As a primary structural element of the fuselage, this window is engineered to carry the full cabin pressurization load, provide a fail-safe barrier against decompression, and withstand the extreme thermal gradients of the flight environment.
Manufactured by Lee Aerospace, a world-renowned specialist in aircraft transparencies, this window is built to meet or exceed the performance of the original part. It features a sophisticated, multi-layer, fail-safe construction using biaxially stretched acrylic for superior strength and damage tolerance. The entire assembly is thermally formed to the precise contour of the Beech 1900 fuselage, ensuring a perfect, aerodynamically clean, and structurally sound installation. Backed by a rigorous FAA-PMA certification for primary structures, the Lee Aerospace LA129-430041-1 is the premier choice for operators seeking the ultimate in quality, safety, and value.
Key Features
FAA-PMA Certified Primary Structure: A fully certified, airworthy replacement for Textron/Beechcraft P/N 129-430041-1, backed by extensive FAA-approved testing for this critical structural application.
Manufactured by a Transparency Specialist: Produced by Lee Aerospace, an industry leader with decades of experience and state-of-the-art manufacturing capabilities in aerospace transparencies.
Fail-Safe Laminated Construction: Features a multi-pane design with a tough Polyvinyl Butyral (PVB) interlayer that provides redundancy and damage containment, preventing catastrophic failure.
High-Strength Stretched Acrylic: Fabricated from aerospace-grade, biaxially stretched acrylic (per MIL-PRF-25690), offering exceptional tensile strength, impact resistance, and long-term optical clarity.
Precision Formed and Machined: Thermally formed and CNC-machined to the exact dimensions and contour of the fuselage for a perfect, drop-in fit.
Technical Specifications
Part Number: LA129-430041-1
OEM Part Number: 129-430041-1
Component Type: Laminated Cabin Window Assembly (Primary Structure)
OEM Manufacturer: Lee Aerospace
Certification: FAA-PMA (Replaces Textron/Beechcraft P/N 129-430041-1)
Material: Multi-layer, Biaxially Stretched Acrylic (PMMA) with Polyvinyl Butyral (PVB) Interlayer.
Governing Specifications: FAA-PMA, meets or exceeds Textron Aviation specifications and MIL-PRF-25690.
Aircraft Compatibility
Beechcraft (Textron Aviation): 1900, 1900C, 1900D
Note: This compatibility list is for general reference. Applicability can vary by aircraft serial number. The Lee Aerospace eligibility list and the aircraft's specific Illustrated Parts Catalog (IPC) are the final authorities.
Applications
Primary Cabin Window: Provides a viewing portal for passengers while simultaneously acting as a critical structural and pressure-bearing part of the fuselage.
Direct OEM Replacement: A certified, direct replacement for a time-expired, crazed, delaminated, or damaged original equipment window.
Why Choose LA129-430041-1?
A cabin window failure on a pressurized aircraft at altitude is a catastrophic event. The Lee Aerospace LA129-430041-1 has undergone a rigorous FAA-PMA certification process, proving through extensive testing and analysis that it is equal to or better than the original part. Lee Aerospace's specialization in transparencies means they are at the forefront of manufacturing technology, often resulting in a product with superior optical quality and durability. For operators of the Beechcraft 1900, this window offers the uncompromising safety of a fully certified, primary structural component from a trusted industry leader, often with significant cost savings and better availability compared to the OEM.
The remarkable strength of the LA129-430041-1 window is a direct result of the material science of biaxially stretched acrylic (per MIL-PRF-25690). The manufacturing process begins with a sheet of high-quality, cross-linked cast acrylic. This sheet is heated to its softening point and then mechanically stretched in both the X and Y directions. This process physically orients and aligns the long polymer chains of the Polymethyl methacrylate (PMMA) from a random, amorphous state into a highly ordered structure. This molecular alignment dramatically increases the intermolecular attractive forces, resulting in a material that has up to double the tensile strength and an order of magnitude (>10x) greater resistance to crazing and crack propagation than the original cast acrylic. This transformation is what imbues the material with the damage tolerance and strength-to-weight ratio required to function as a transparent, load-bearing structural component of a pressurized aircraft.
Note: The LA129-430041-1 is a primary structural airframe component. Installation is a critical maintenance task that must be performed by a certified A&P/IA mechanic with structural experience, strictly in accordance with the Beechcraft 1900 Structural Repair Manual (SRM). The procedure requires the use of new, specified window seals and retaining hardware. All fasteners must be torqued to the specified values and in the correct sequence. A post-installation cabin pressurization functional test and leak check is mandatory before the aircraft is returned to service.
Documentation
Lee Aerospace Website: Full eligibility lists, technical data, and warranty information for this FAA-PMA part are available on the official Lee Aerospace website. All installation procedures are contained within the Textron Aviation Beechcraft 1900 Series Maintenance Manual and Structural Repair Manual (SRM).
