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7511211 – Purolator OEM Liquid Filter Element
Available now through the AirParts Aero marketplace.
Overview Section
The 7511211 is a high-performance Purolator OEM liquid filter element designed for precision filtration in aviation hydraulic, fuel, and oil systems. Manufactured by Purolator Facet (now part of Mann+Hummel), this component is a "Pleated Media" cartridge engineered to protect sensitive downstream components—such as fuel injectors, hydraulic actuators, and precision valves—from microscopic particulate contamination.
Utilizing Purolator’s proprietary Micropleat® technology, the 7511211 features resin-impregnated cellulose or synthetic media that maximizes surface area within a compact cylindrical footprint. This design allows for high flow rates with minimal initial pressure drop, making it an essential component for maintainers of Grumman, Cessna, and Piper airframes.
Enhanced Technical Data
| Technical Metric | Specification Data |
| Filtration Rating | 10 Micron (Nominal) |
| Media Type | Pleated Paper (Resin Impregnated) |
| Max Flow Rate | 6.0 GPM (22.7 LPM) |
| Operating Temperature | $-40°F$ to $+250°F$ ($-40°C$ to $+121°C$) |
| Structural Collapse Rating | 150 PSID (Differential Pressure Minimum) |
| Outer Diameter (OD) | 1.700 in |
| Inner Diameter (ID) | 0.880 in |
| Length | 3.400 in |
| Hardware Material | Aluminum End Caps and Center Tube |
| Seals | Buna-N (NBR) O-Ring |
Advanced Engineering & Structural Application
The 7511211 is engineered for Systemic Fluid Integrity. In aviation systems, the presence of "hard" particles (silica, metal shavings) or "soft" contaminants (elastomer degradation) can lead to catastrophic component failure.
Engineering Insight: Micropleat® Depth Filtration
The 7511211 utilizes a high-density pleated design that increases the effective filtration area by over 300% compared to non-pleated mesh filters. This allows for "Depth Filtration," where contaminants are trapped within the layers of the media rather than just on the surface. The Aluminum center tube is perforated to provide structural support, ensuring the element does not collapse under the high differential pressures (transient spikes) often seen in hydraulic systems during landing gear extension or retraction.
Fluid Compatibility
The resin-impregnated media and Buna-N seals are specifically formulated for compatibility with MIL-H-5606 and MIL-PRF-83282 hydraulic fluids, as well as Jet A-1 and aviation gasolines. It is effectively "chemically inert" to these hydrocarbons, preventing media migration into the fluid stream.
Aircraft Compatibility
The 7511211 is a common filter element for several specialized platforms and assemblies:
Grumman Aircraft: Specifically utilized on the A-10 Thunderbolt II and various Grumman utility models.
Cessna & Piper Fleet: Compatible with AN6235-3A type line filter assemblies.
Standard Filter Housings: Qualified for use in MS28720 and AN6234 filter assembly housings.
The Purolator 7511211 is the definitive choice for airframe technicians seeking to maintain the highest levels of fluid purity. Engineered to meet MIL-F-5504 qualification standards, this 10-micron element provides a superior barrier against the contaminants that cause valve sticking and pump erosion. Whether you are servicing a Grumman A-10 or a standard general aviation hydraulic circuit, the 7511211 offers the flow capacity and structural rigidity required for reliable flight operations. Avoid the risks of system-wide contamination—choose the proven performance of Purolator OEM filtration.
Installation & Maintenance Addendum
Seal Orientation: The 7511211 comes with a Buna-N O-ring. Ensure the O-ring is seated squarely in the housing groove and lubricated with the system's fluid to prevent "pinching" during the reassembly of the filter bowl.
Bubble Test Integrity: Each element is 100% "Bubble Tested" at the factory. If the element is dropped or shows any signs of pleat separation, it should be discarded as the filtration integrity may be compromised.
Scheduled Replacement: This filter should be replaced at every 100-hour or Annual inspection, or whenever the system's Differential Pressure Indicator (DPI) signals a bypass condition.
