?unique=50baf23)
5849166-1 – Textron Aviation OEM Fluid Pressure Filter
Part Number: 5849166-1
Manufacturer: Textron Aviation (Cessna/Beechcraft)
Common Synonyms: Hydraulic Pressure Filter, Inline Fluid Filter, Micron Filter Element
Overview Section
The 5849166-1 is a genuine Textron Aviation OEM high-pressure fluid filter assembly, primarily utilized in the hydraulic and power-steering systems of the Cessna Citation and Beechcraft King Air series. This filter is engineered to remove microscopic particulate matter from the hydraulic circuit before it can reach sensitive downstream components such as servo valves, landing gear actuators, or the antiskid control valves.
Constructed with a stainless steel mesh or pleated micro-glass media, the 5849166-1 is designed to maintain high flow rates while under extreme system pressures (up to 3,000 PSI). As an OEM component, it meets the exact filtration efficiency and "Beta Ratio" requirements mandated by the aircraft’s Type Certificate to prevent premature wear and hydraulic "chatter."
Enhanced Technical Data
| Technical Metric | Specification Data |
| Filtration Rating | 10–15 Microns (Absolute) |
| Max Operating Pressure | 3,000 PSI (207 bar) |
| Media Material | Pleated Stainless Steel or High-Performance Micro-Glass |
| Bypass Valve Cracking Pressure | 50–70 PSID (Differential) |
| Fluid Compatibility | MIL-PRF-5606 / MIL-PRF-83282 / Skydrol |
| End Cap Material | Anodized Aluminum / Corrosion Resistant Steel |
| Seal Material | High-Temp Fluorocarbon (Viton) or Ethylene Propylene |
| Weight | ~0.45 lbs |
Advanced Engineering & Structural Application
The 5849166-1 is engineered for Systemic Protection. In modern aircraft hydraulic systems, many valves operate with clearances measured in microns. Particulate contamination can cause these valves to stick, leading to "uncommanded" movements or the inability to extend landing gear.
Engineering Insight: Differential Pressure & Bypass
The 5849166-1 contains an internal Bypass Relief Valve. In the event of a "cold start" (where fluid is highly viscous) or a heavily contaminated element, the relief valve opens to ensure the system does not lose total fluid flow, which could lead to pump cavitation. Additionally, this filter housing is typically equipped with a Differential Pressure Indicator (DPI)—a small pop-up button that triggers when the filter element is nearing its holding capacity.
Aircraft Compatibility
The 5849166-1 is a high-utilization component within the Textron specialized jet and turboprop fleet:
Cessna Citation Series: Found in the hydraulic power pack and braking modules of the Citation 500, 525, and 560 series.
Beechcraft King Air: Utilized in the landing gear hydraulic systems and optional power steering modules.
Hawker 400XP: Integrated into the main hydraulic return and pressure manifolds.
The Textron Aviation 5849166-1 is a critical line of defense for your aircraft's hydraulic system. When operating high-performance jets and turboprops, fluid purity is synonymous with flight safety. This OEM pressure filter provides superior particulate capture and high-pressure durability that generic filters cannot match. By maintaining the 5849166-1 at the recommended Phase Inspection intervals, you protect expensive hydraulic pumps and actuators from abrasive wear and contamination-induced failures. Secure your airframe's reliability with the precision engineering of Textron OEM filtration.
Installation & Maintenance Addendum
Depressurization: Always ensure the hydraulic system is fully depressurized (check gauges and accumulators) before attempting to remove the filter housing.
Seal Inspection: When replacing the 5849166-1 element, always replace the housing O-rings. Lubricate the new seals with the system's hydraulic fluid to prevent "pinching" during re-installation.
Torque Specifications: The filter housing must be torqued to the specific value in the Aircraft Maintenance Manual (AMM). Over-tightening can crack the filter head, while under-tightening can lead to high-pressure leaks and fluid atomization.
