50-921552-16 - Textron Aviation OEM Fuel Cell Assembly for King Air Aircraft

50-921552-16 – Textron Aviation OEM Right-Hand Nacelle Fuel Cell for King Air 90 Series

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Overview

The 50-921552-16 is the genuine Textron Aviation Original Equipment Manufacturer (OEM) flexible fuel cell for the right-hand engine nacelle tank of the Beechcraft King Air 90 series aircraft. This flight-critical component is engineered to the most rigorous standards to safely contain and store the aircraft's fuel supply. The -16 suffix denotes a specific, later-revision of the base 50-921552 fuel cell, as defined by Textron Aviation's engineering drawings, potentially incorporating material or design improvements 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 complex contours of the nacelle structure. As a genuine Textron Aviation part, the 50-921552-16 is the factory-specified component for specific aircraft serial number ranges, guaranteeing a perfect fit, proper placement of all integrated fittings, and the chemical resistance 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 -16 Revision: Represents a specific, controlled version of the fuel cell, ensuring installation of the latest approved design and materials.

• Right-Hand Nacelle Configuration: Precisely shaped and configured for the right-hand (RH) nacelle tank, ensuring correct placement of fuel pickups and accurate fuel quantity readings.

• 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.

Technical Specifications

• Part Number: 50-921552-16

• Base Part Number: 50-921552

• Component Type: Flexible Fuel Cell / Bladder Tank

• OEM Authority: Textron Aviation

• Location: Right-Hand (RH) Engine Nacelle Tank

• Material: Multi-layer vulcanized nitrile rubber and reinforced nylon fabric composite, per the -16 revision specification.

• Governing Specification: Textron Aviation Engineering Drawing 50-921552-16.

Aircraft Compatibility

This fuel cell is the specified OEM part for the RH 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 -16 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 right-hand nacelle fuel bay of specified Beechcraft King Air models where the 50-921552-16 is explicitly called for by the IPC.

Why Choose 50-921552-16?

Part number conformity is a cornerstone of aviation safety, especially for paired components like left-hand and right-hand fuel cells. The -16 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 50-921552-16 is the only part guaranteed to meet these specific revision requirements, ensuring the safety and integrity of the aircraft's fuel system.

The design of a flexible fuel cell assembly like the 50-921552-16 involves complex engineering beyond its material composition. The cell's shape is designed to prevent the formation of air pockets during refueling and to ensure a consistent, uninterrupted supply of fuel to the engine pickups during all normal flight attitudes. The installation relies on a system of snaps, clips, and lacing cords that suspend the bladder within the structural bay. This suspension system is critical; it prevents the cell from chafing against ribs, stringers, or fasteners, which could lead to abrasion and an eventual leak. It also allows the cell to "float" slightly, accommodating the natural flexure of the wing and nacelle structure in flight without imparting stress on the cell's seams or fittings. Proper installation and lacing are therefore as critical to the system's integrity as the cell's own construction.

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, dash number, and side (LH vs RH) 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.