R581559 - Textron Aviation OEM Seal 12 Foot 3 Meter Section

R581559 – Textron Aviation OEM Seal 12 Foot 3 Meter Section

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Overview

The Textron Aviation R581559 is a genuine OEM, flight-critical inflatable cabin door seal, sold in a 12-foot section and engineered for the main entry door of the Beechcraft King Air series. This is not a simple weatherstrip; it is a sophisticated, fabric-reinforced, extruded silicone seal that is a key component of the aircraft's pressurization and environmental systems. The R581559 is designed to be inflated using regulated engine bleed air once the door is closed and locked, creating a perfect, airtight seal around the entire door frame. Its integrity is fundamental to the aircraft's ability to maintain a safe and comfortable cabin pressure at high altitudes.

This seal's advanced design provides a superior barrier against pressure loss, water ingress, and acoustic noise, ensuring a quiet cabin environment. As a genuine Textron OEM part, it guarantees the correct material composition, profile, and durability required for this critical application.

Key Features

• Pneumatically Inflated Design: The seal is designed as a hollow, flexible tube that is inflated by low-pressure engine bleed air after the door is secured. This inflation cycle causes the seal to expand and press firmly against both the door and the fuselage frame, creating a perfect, uniform pressure seal.

• High-Performance Silicone Rubber: Extruded from a high-grade, temperature-resistant silicone rubber compound. This material is chosen for its exceptional flexibility at very low temperatures (preventing it from becoming brittle at high altitudes), its long service life, and its resistance to ozone and UV degradation.

• Fabric Reinforcement: The silicone is reinforced with an internal fabric layer. This provides high tensile strength and resistance to tearing and rupture, allowing the seal to withstand thousands of pressurization and inflation/deflation cycles without failure.

• Superior Acoustic & Environmental Sealing: When inflated, the seal provides an exceptional barrier to acoustic noise, dramatically reducing wind and engine noise inside the cabin. It also creates a robust seal against rain and moisture on the ground.

• Genuine Textron OEM Part: As a genuine factory component, it guarantees the exact extrusion profile, material durometer (hardness), and bleed air compatibility required for the King Air's pressurization system, ensuring a fully certified and airworthy installation.

Technical Specifications

• Part Number: R581559

  
  

  
  

• Component Type: Inflatable Cabin Door Seal

• Material: Fabric-Reinforced, High-Temperature Silicone Rubber

• Length: Sold in 12 Foot (3.66 Meter) sections.

• Inflation Source: Regulated Engine Bleed Air

• Primary Function: Provides primary pressurization and acoustic seal for the main cabin door.

• Certification: FAA Production Approval

Aircraft Compatibility

The R581559 is the specified OEM inflatable door seal 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, 300/350 Series

Applications

The R581559 is a flight-critical component for the safety and comfort of the aircraft:

• Cabin Pressurization: The primary seal that allows the aircraft to maintain a safe and comfortable cabin altitude during high-altitude flight.

• Scheduled Maintenance: Door seals are a wear item and are inspected regularly for chafing, cracking, tears, or leaks. A leaking seal can cause the pressurization system to work harder or fail to maintain the desired cabin altitude.

• Airframe Refurbishment: An essential component to replace during any major interior or airframe refurbishment to ensure a quiet, draft-free cabin.

Why Choose R581559?

The integrity of the cabin pressure vessel is a primary safety-of-flight concern. A failure of the main door seal can lead to a gradual or even rapid depressurization event. The Textron Aviation R581559 is the only seal certified by the manufacturer for this application. Using a genuine OEM part ensures the seal is made from the correct, certified materials that will not become brittle at altitude and has the precise shape needed to create a safe, reliable seal every time the door is closed.

The R581559 inflatable door seal is a highly effective solution for sealing large, complex doors on pressurized aircraft. A simple compression seal would require the door to be forced shut with immense pressure to create an airtight seal, making it very difficult to operate. The inflatable seal solves this. The door is designed to close and latch easily with the seal in its deflated state. Once the door is secure, a sensor activates a valve that routes regulated bleed air into the hollow seal. The seal inflates with a low pressure (e.g., 15-20 PSI), expanding to fill the entire gap between the door and the fuselage. This creates a powerful and uniform "pneumatic clamp" that provides a perfect seal. Before the door can be opened, the seal is automatically deflated, allowing for easy operation. This system provides a superior seal with much lower mechanical stress on the door's locking mechanisms.

Note: This is a flight-critical pressurization system component. Installation must be performed by a certified A&P mechanic with experience in King Air systems, in strict accordance with the current Textron Aviation (Beechcraft) maintenance manual. The seal must be cut to the precise length and the ends vulcanized or bonded together to form a continuous loop. Proper installation and leak checks are mandatory for an airworthy repair.