AeroShell 550043663-1QT – Fluid 41 Aircraft Hydraulic Fluid, 1 Quart
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AeroShell Fluid 41 is a mineral hydraulic oil manufactured to an exceptionally high level of cleanliness and possesses enhanced fluid properties. AeroShell Fluid 41 contains additives that provide good low-temperature fluidity, anti-wear, oxidation-corrosion inhibition, and shear stability. Additionally, metal deactivators and foam inhibitors are incorporated into this high viscosity index fluid to enhance performance in hydraulic applications. AeroShell Fluid 41 is capable of operating over a wide temperature range.
AeroShell Fluid 41 is designed as a hydraulic fluid for all modern aircraft applications that require a mineral-based hydraulic fluid. AeroShell Fluid 41 is particularly recommended where the use of a "superclean" fluid can contribute to improvements in component reliability and can be used in aircraft systems operating unpressurized between -65°F and 194°F (-54°C to 90°C) and pressurized between -65°F and 275°F (-54°C to 135°C). AeroShell Fluid 41 should be used in systems with synthetic rubber components and must not be used in systems incorporating natural rubber.
AeroShell Fluid 41 is compatible with AeroShell Fluids 4, 31, 61, and LGF. Chlorinated solvents should not be used for cleaning hydraulic components that use AeroShell Fluid 41. The residual solvent contaminates the hydraulic fluid, potentially leading to corrosion. Due to its properties, it is also used in several industrial applications.
| General Information | |
|---|---|
| Part # | 550043663-1QT |
| Manufacturer | AeroShell |
| Shipping Information | |
|---|---|
| Schedule B | 3819000000 |
| ECCN | EAR99 |
| Hazmat/Dangerous Goods | Yes |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* |
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QUESTIONS & ANSWERS
AeroShell Fluid 41 is formulated for aircraft that require a super-clean mineral hydraulic fluid with dependable low-temperature performance. It supports the reliable operation of landing gear, brake systems, flight control actuators, and other hydraulic components under demanding conditions. Its high manufacturing cleanliness helps minimize contamination-related wear and improves overall system reliability.
AeroShell Fluid 41 functions effectively across a broad temperature span, performing in unpressurized systems from -65°F to 194°F (-54°C to 90°C) and in pressurized systems up to 275°F (135°C). This versatility ensures stable hydraulic response during cold-weather starts and high-heat flight operations.
AeroShell Fluid 41 is miscible with most MIL-PRF-5606 fluids, including AeroShell Fluids 4, 31, 61, 71, and SSF/LGF. Even though it is compatible, performing a full system flush when transitioning between fluids is recommended to maintain system cleanliness. Always verify compatibility through the Aircraft Maintenance Manual (AMM).
AeroShell Fluid 41 delivers strong low-temperature fluidity, robust oxidation and corrosion protection, and stable anti-wear performance. Its super-clean production standards reduce the risk of contamination that can cause valve sticking or premature component wear. Meeting MIL-PRF-5606H specifications, it provides dependable and consistent performance in modern aircraft hydraulic systems.
When kept in sealed, unopened containers under proper storage conditions, AeroShell Fluid 41 typically maintains its performance for up to three years. Storing it in a controlled environment protects it from moisture and particulate contamination. Always check container markings for production or batch information.
Yes. AeroShell Fluid 41 is dyed red to simplify leak detection and troubleshooting within hydraulic systems. The visible coloration enables technicians to quickly identify system breaches or abnormal fluid loss.
This fluid uses a refined mineral oil base enhanced with additives that provide anti-wear protection, oxidation resistance, foam control, and corrosion inhibition. Its high viscosity index helps maintain predictable performance across a wide range of operating temperatures.
No. AeroShell Fluid 41 is not classified as a fire-resistant hydraulic fluid. Aircraft requiring greater fire protection must use fluids such as MIL-PRF-83282 or phosphate ester–based formulations like Skydrol. Confirm fluid specification requirements with the AMM before selecting a substitute.
Yes. AeroShell Fluid 41 maintains excellent fluidity down to -65°F (-54°C), supporting reliable system operation during cold-weather starts and operations. This makes it a strong choice for aircraft frequently exposed to low-temperature environments.
The fluid contains specialized inhibitors that help prevent oxidation, rust formation, varnish build-up, and component degradation. These protective qualities help extend hydraulic system life, reduce maintenance frequency, and support more reliable operation.
AeroShell Fluid 41 is generally compatible with modern synthetic rubber compounds used in most aircraft hydraulic systems. It should not be used with natural rubber seals. Always consult the AMM to confirm seal-material compatibility.
Typical applications include landing gear mechanisms, flap and flight control actuators, brake systems, steering systems, and general hydraulic accessories. Its stability under high pressure and low temperatures makes it suitable for a wide range of aviation environments.
Yes. AeroShell Fluid 41 is the improved successor to the discontinued AeroShell Fluid 4, offering better oxidation stability, cleaner formulation, and enhanced performance properties.
Store the fluid in sealed containers in a clean, dry environment, away from heat and direct sunlight. Preventing moisture and debris intrusion helps preserve its performance and cleanliness.
Replacement intervals depend on aircraft usage, contamination levels, and OEM guidance. Many operators rely on periodic fluid analysis rather than fixed schedules to determine when moisture or particulate levels warrant a fluid change.
Yes. Its viscosity stability, lubricity, and anti-wear additives allow AeroShell Fluid 41 to perform well in demanding high-pressure applications, such as landing gear and flight control systems.
