50-389034-12 - Textron Aviation OEM Fuel Cell for King Air Aircraft

50-389034-12 – Textron Aviation OEM Main Wing Fuel Cell for King Air 200 Series

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Overview

The 50-389034-12 is the genuine Textron Aviation Original Equipment Manufacturer (OEM) flexible fuel cell for the main (outboard) wing fuel bays of the Beechcraft King Air B200 and B200GT model aircraft. This flight-critical component is a highly engineered bladder tank, designed to fit the precise contours of the wing's internal structure. The -12 suffix denotes a specific revision of the base part number, controlled by Textron's engineering drawings and potentially incorporating material or design improvements to enhance service life and reliability.

Constructed from advanced, multi-layered vulcanized rubber and reinforced fabric composites, this fuel cell is designed to safely and securely contain the aircraft's fuel supply under all operational conditions. As a genuine Textron Aviation part, the 50-389034-12 is the only component guaranteed to meet the aircraft's type-certified design for fit, material integrity, and long-term performance.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component for the Beechcraft King Air 200 series, ensuring airworthiness.

• Specific -12 Revision: Represents a specific, controlled version of the fuel cell, ensuring installation of the latest approved design and materials.

• Main Wing Bay Configuration: Engineered for a precise fit within the main outboard fuel bay of the King Air 200 wing, and is applicable to both Left-Hand (LH) and Right-Hand (RH) positions.

• Flexible Bladder-Type Construction: The pliable, multi-ply design allows for installation into the complex wing structure, maximizing usable fuel volume.

• Multi-Ply, Puncture-Resistant Design: Features multiple layers of reinforced fabric laminated between specialized rubber compounds to provide exceptional strength and resistance to punctures and tearing.

• Impervious to Jet Fuel and Additives: The inner liner is formulated from a nitrile rubber compound that is chemically inert to jet fuel, microbial growth inhibitors, and other fuel additives.

Technical Specifications

• Part Number: 50-389034-12

• Base Part Number: 50-389034

• Component Type: Flexible Fuel Cell / Bladder Tank

• OEM Authority: Textron Aviation

• Location: Main Wing Fuel Bay (Outboard), applicable for both Left-Hand (LH) and Right-Hand (RH) installation.

• Material: Multi-layer vulcanized nitrile rubber and reinforced nylon fabric composite, per the -12 revision specification.

• Governing Specification: Textron Aviation Engineering Drawing 50-389034-12.

Aircraft Compatibility

This fuel cell is the specified OEM part for the main wing tanks on specific serial number ranges of the Beechcraft King Air 200 family.

• Aircraft Models:

  • King Air B200

  • King Air B200GT

Note: This part is for standard wing configurations. The -12 suffix is a critical part of the part number. Applicability is strictly determined by the aircraft's specific serial number. The aircraft's current Illustrated Parts Catalog (IPC) is the final and absolute authority for confirming part number eligibility.

Applications

• Sole Application: Primary containment and storage of Jet A/A1 fuel in the main (outboard) wing fuel bays of specified Beechcraft King Air models where the 50-389034-12 is explicitly called for by the IPC.

Why Choose 50-389034-12?

Part number conformity is a cornerstone of aviation safety. The -12 revision of this fuel cell was established by Textron's engineers for specific reasons, such as material enhancements or design improvements. Using the exact part number called for in the IPC is mandatory for a compliant and airworthy installation. The genuine OEM 50-389034-12 is the only part guaranteed to meet these specific revision requirements, ensuring the safety and integrity of the aircraft's fuel system.

The successful engineering of a large wing fuel cell like the 50-389034-12 is critically dependent on its internal and external support system. During installation, the bladder is carefully suspended within the wing bay using a series of lacing cords, snaps, and clips that attach to points on both the cell and the aircraft structure. This suspension is not arbitrary; it is precisely engineered to prevent cell migration and folding during flight maneuvers, which could trap fuel away from the pickups or cause inaccurate fuel quantity readings. More importantly, this system prevents the cell's outer surface from chafing against structural elements like ribs, fasteners, or stringers. Constant, unmitigated chafing is a primary cause of fuel cell failure, as it can abrade through the outer layers and lead to a leak. A correct installation ensures the cell is properly supported, allowing it to "float" within the bay and accommodate wing flex without damage.

Note: This is a flight-critical component. Its installation is a complex and labor-intensive task that must be performed by a certified A&P mechanic, preferably with direct experience in fuel cell replacement, in strict accordance with the aircraft maintenance manual. The fuel bay must be meticulously cleaned and inspected for any foreign objects or sharp edges prior to installation. Fuel cells have a finite service life and require specific storage conditions. Always verify the exact part number and dash number against the aircraft serial number in the IPC.

Documentation

All technical data, installation procedures, and service life information are proprietary to Textron Aviation and are contained within the official Beechcraft King Air Maintenance Manual and the Component Maintenance Manual (CMM) for the fuel cell.