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KD651510 – Donaldson FAA-PMA Fluid Pressure Filter Parts Kit
Available now on the Airparts.aero Marketplace.
The KD651510 is a comprehensive, FAA-PMA certified fluid pressure filter service kit manufactured by Donaldson Aerospace & Defense. This kit is specifically engineered for the high-pressure hydraulic and lubrication systems of turbine-powered aircraft, including those from Bombardier, Textron, and Gulfstream. As a critical maintenance assembly, the KD651510 provides all the necessary components—including the primary filter element and precision-molded seals—required to restore a pressure-side filtration unit to its original airworthy specification during a scheduled inspection or AOG (Aircraft On Ground) event.
Donaldson utilized their proprietary Synteq™ synthetic media in the filter element of the KD651510, which offers superior "dirt-holding" capacity and lower pressure drops compared to traditional cellulose filters. This ensures that even microscopic particulates (as small as 3–5 microns) are trapped before they can cause "stiction" in sensitive hydraulic servo-valves or erosion in high-speed turbine bearings.
Key Features
FAA-PMA Certified: Fully approved as a direct replacement for OEM part numbers, ensuring complete regulatory compliance with FAA and EASA airworthiness standards.
Synteq™ High-Efficiency Media: Features a glass-fiber synthetic matrix that provides consistent "Absolute Filtration" ratings, even under the high-pulse pressures of an active hydraulic system.
Complete "Single-Source" Kit: Eliminates the need to source individual O-rings and gaskets separately, reducing the risk of using mismatched or non-compatible seals.
Chemical Compatibility: The included seals are manufactured from high-grade Viton or Fluorocarbon elastomers, designed to resist degradation from Skydrol (LD-4/5) and other aggressive phosphate-ester hydraulic fluids.
Structural Integrity: The filter element features a reinforced center tube to prevent "collapse" during high-differential pressure events (e.g., cold-start bypass conditions).
Technical Specifications
Part Number: KD651510
Manufacturer: Donaldson Aerospace & Defense
Component Type: Fluid Pressure Filter Parts Kit
Filtration Rating: 5-Micron Absolute (Typical for KD65 series)
Fluid Compatibility: Hydraulic Fluid (Skydrol/MIL-H-5606) and Engine Oil
Operating Pressure: Rated for high-pressure circuits (up to 3,000 PSI systems)
Certification: FAA-PMA (Direct replacement for specific OEM assemblies)
ATA Chapter: ATA 29 (Hydraulic Power) / ATA 79 (Engine Oil)
Aircraft Compatibility
Bombardier Series: Challenger 604, 605, and Global 5000/6000 hydraulic systems.
Textron Aviation: Various Citation and King Air high-pressure fluid circuits.
Regional Jets: Embraer ERJ and CRJ series pressure-line filtration.
Note: The KD651510 is a direct-fit replacement for several OEM filter assemblies. Always verify the cross-reference against your Aircraft Maintenance Manual (AMM) or Illustrated Parts Catalog (IPC) Section 29-10 to confirm this kit matches your filter housing serial number.
Applications
The KD651510 is utilized for System Contamination Control. Its primary roles include:
High-Pressure Hydraulic Filtration: Protecting the "upstream" side of flight control actuators from pump-wear debris.
Engine Oil Scavenge/Pressure Loops: Ensuring the lubrication circuit remains free of carbon deposits and metallic "fines."
Landing Gear Actuation: Maintaining the purity of the fluid used to extend and retract heavy landing gear assemblies.
Why Choose KD651510?
Choosing the Donaldson KD651510 is an investment in Component Longevity. In modern high-pressure hydraulics, "silt" (microscopic particles) acts like a liquid sandpaper. Standard filters might stop large chunks, but the KD651510's Absolute Rating ensures that the "silt" is removed before it can bridge the fine tolerances of a flight-control valve. Furthermore, the inclusion of OEM-spec seals in the kit prevents "extrusion failure," where a sub-standard O-ring is pushed out of its groove under the 3,000 PSI operating pressure of a turbine aircraft's hydraulic bus.
The KD651510 functions on the principle of Depth Filtration and Beta Ratios ($\beta$). In fluid dynamics, the effectiveness of the KD651510 is measured by its ability to maintain a consistent Pressure Drop ($\Delta P$) across the media. The Synteq™ fibers are randomly oriented to create a tortuous path for contaminants, effectively increasing the "capture probability" without restricting flow. The physics of the internal By-pass Relief Valve (housed in the aircraft fitting) rely on the filter's integrity; if the KD651510 element is correctly maintained, it ensures that the system only enters "By-pass Mode" during genuine clogging events, rather than during normal high-flow transients.
Note: This is a maintenance-critical component. Prior to installation, ensure the hydraulic system is depressurized. Lubricate the new O-rings with the specific system fluid (e.g., Skydrol) to prevent "nibbling" during assembly. Always perform a "Leak Check" and "Bleed" procedure after filter replacement as per the AMM. Properly dispose of used filters as hazardous waste.
