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129-430041-1 – Textron Aviation OEM Laminated Cabin Window for Beech 1900
Available now on the Airparts.aero Marketplace.
Overview
The Textron Aviation 129-430041-1 is a genuine OEM, flight-critical, laminated and formed cabin window for the Beechcraft 1900 series twin-turboprop airliner. This is not a simple pane of plastic; it is a primary structural component of the fuselage, engineered to function as a transparent section of the pressure vessel. It is designed to carry the full cabin pressurization load at high altitudes, withstand extreme temperature differentials, and provide a fail-safe barrier in the event of an impact. A failure of a cabin window at altitude would be a catastrophic explosive decompression event, making the integrity of this component absolutely paramount to flight safety.
This window is constructed from multiple layers of high-strength, biaxially stretched acrylic, bonded together with a tough, transparent Polyvinyl Butyral (PVB) interlayer. The stretching process aligns the acrylic's molecular structure, dramatically increasing its strength and resistance to crazing and crack propagation. The laminated, fail-safe design ensures that if one pane were to fail, the remaining layer(s) and the interlayer would safely maintain cabin pressure, allowing the flight crew ample time to perform an emergency descent. The window is then thermally formed to the precise contour of the Beech 1900 fuselage for a perfect, low-drag, structural fit.
Key Features
Genuine Textron Aviation OEM Part: The original, factory-specified window, guaranteeing perfect fit and conformity to the Beechcraft 1900's type certificate for pressurization and structural integrity.
Fail-Safe Laminated Construction: Features a multi-pane design with a 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 service life.
Pressurization Load-Bearing: Engineered as a primary structural element designed to carry the full cabin pressure differential load with a significant margin of safety.
Thermally Formed to Fuselage Contour: Precisely shaped to match the exact curvature of the Beech 1900 fuselage, ensuring a perfect aerodynamic and structural interface.
TSO Certified: Manufactured and tested to the stringent performance and quality standards of FAA TSO for aircraft transparencies.
Technical Specifications
Part Number: 129-430041-1
PMA AVAILABLE
PMA Part Number: LA129-430041-1
Component Type: Laminated Cabin Window Assembly (Primary Structure)
OEM Manufacturer: Textron Aviation (Beechcraft)
Material: Multi-layer, Biaxially Stretched Acrylic (PMMA) with Polyvinyl Butyral (PVB) Interlayer.
Governing Specifications: Manufactured to Textron Aviation proprietary standards and meets or exceeds FAA TSO-C22 and MIL-PRF-25690.
Aircraft Compatibility
Beechcraft (Textron Aviation): 1900, 1900C, 1900D
Note: This is a flight-critical structural component. The aircraft's specific Illustrated Parts Catalog (IPC) for a given serial number is the final and absolute authority for determining part number eligibility.
Applications
Cabin Passenger Window: Provides a viewing portal for passengers while simultaneously acting as a critical structural and pressure-bearing part of the fuselage.
Pressure Vessel Integrity: A key component in maintaining the integrity of the aircraft's pressurized cabin.
Why Choose 129-430041-1?
There is absolutely no substitute for a certified OEM window on a pressurized aircraft. The engineering, materials, and quality control that go into this component are of the highest order. A non-certified window would lack the proven strength of stretched acrylic, may use an inferior interlayer, and would not have been tested to withstand the thousands of pressure cycles, extreme thermal shocks, or potential bird strike loads it will experience in its lifetime. The genuine Textron Aviation 129-430041-1 is the only part guaranteed to meet the original type design, ensuring the safety of the aircraft, its crew, and its passengers.
The remarkable strength of the 129-430041-1 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 glass transition temperature and then mechanically stretched in both the X and Y axes, often by 200% or more. This process physically orients and aligns the long polymer chains of the Polymethyl methacrylate (PMMA) from a random, amorphous state into a highly ordered, crystalline-like structure. This molecular alignment dramatically increases the intermolecular attractive forces (Van der Waals 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 129-430041-1 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
No public-facing OEM specification sheet was located for this proprietary part number. All authoritative technical data, installation procedures, and inspection criteria are contained within the official Textron Aviation Beechcraft 1900 Series Maintenance Manual and Structural Repair Manual (SRM).
