50-921554-12 - Textron Aviation OEM Fuel Cell for King Air Aircraft

50-921554-12 – Textron Aviation OEM LH Nacelle Fuel Cell for King Air 90 Series

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Overview

The 50-921554-12 is a specific, later-revision Original Equipment Manufacturer (OEM) flexible fuel cell for the left-hand engine nacelle tank of the Beechcraft King Air 90 series aircraft. As a flight-critical component, this fuel cell is engineered to the most rigorous standards to safely contain fuel. The -12 suffix denotes a specific version of the base 50-921554 fuel cell, as defined by Textron Aviation's engineering drawings. This revision may incorporate material improvements, design modifications, or updated manufacturing processes intended to enhance service life and reliability.

Constructed from advanced, multi-layered rubber and fabric composites, this flexible bladder tank is designed to fit perfectly within the nacelle structure. As a genuine Textron Aviation part, the 50-921554-12 is the factory-specified component for specific aircraft serial number ranges, guaranteeing a perfect fit, correct fitting placement, and the material integrity required for long-term, airworthy service.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component for the Beechcraft King Air 90 series, ensuring airworthiness.

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

• Flexible Bladder-Type Construction: The pliable, multi-ply design allows for a precise fit into the irregular shape of the nacelle fuel bay, 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.

• Integrally Bonded Fittings: All ports for fuel lines, drains, vents, and sending units are integrally bonded and vulcanized into the cell during manufacturing for a seamless, leak-proof assembly.

Technical Specifications

• Part Number: 50-921554-12

• Base Part Number: 50-921554

• Component Type: Flexible Fuel Cell / Bladder Tank

• OEM Authority: Textron Aviation

• Location: Left-Hand (LH) Engine Nacelle Tank

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

• Governing Specification: Textron Aviation Engineering Drawing 50-921554-12.

Aircraft Compatibility

This fuel cell is the specified OEM part for the LH nacelle tank on specific serial number ranges of the Beechcraft King Air 90 family.

• Aircraft Models:

  • King Air C90

  • King Air C90A

  • King Air C90GT

  • King Air E90

Note: 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. Part number supersedure must also be verified.

Applications

• Sole Application: Primary containment and storage of Jet A/A1 fuel in the left-hand nacelle fuel bay of specified Beechcraft King Air models where the 50-921554-12 is explicitly called for by the IPC.

Why Choose 50-921554-12?

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 50-921554-12 is the only part guaranteed to meet these specific revision requirements, ensuring the safety and integrity of the aircraft's fuel system.

In the lifecycle of a certified aircraft, part number revisions like the change from 50-921554 to 50-921554-12 are a critical aspect of continued airworthiness. Such changes are driven by a formal engineering change process, often prompted by in-service data, material science advancements, or evolving regulatory requirements. A suffix change can signify a move to a new rubber compound with improved resistance to microbial growth, a modification to the location or style of a fitting to improve maintainability, or a change in the manufacturing process to enhance the durability of seams and corners. For the installing mechanic, the dash number is not optional; it represents a discrete and significant engineering update. Adherence to the specific part number in the Illustrated Parts Catalog (IPC) ensures that the aircraft is being maintained to its latest, safest, and most reliable design configuration as determined by the OEM.

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 must be stored in a climate-controlled environment, typically in their original sealed packaging. 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.