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AE6695H0180-180 – Textron Aviation OEM High-Pressure Hose Assembly
Available now through the AirParts Aero marketplace.
Overview Section
The AE6695H0180-180 is a specialized, high-pressure Aviation Hose Assembly manufactured by Eaton Aeroquip for Textron Aviation (Cessna/Beechcraft). This assembly is engineered to handle extreme hydraulic pressures and is a critical component in flight control and landing gear actuation systems.
The AE6695 base series utilizes a high-strength Teflon (PTFE) inner tube reinforced with a stainless steel wire braid. The specific -180-180 configuration denotes the assembly's length and the clocking/orientation of its end fittings. Unlike standard rubber hoses, this PTFE-based assembly is designed for "infinite" shelf life and exceptional resistance to the aggressive chemicals found in modern hydraulic fluids.
Key Features Section
Teflon (PTFE) Inner Core: Offers near-universal chemical compatibility and an extremely low coefficient of friction, preventing "sludge" buildup and maintaining high flow rates.
Stainless Steel Wire Braid Reinforcement: Provides the structural integrity required for high-pressure systems while offering excellent protection against external abrasion.
Infinite Shelf Life: Unlike synthetic rubber hoses that degrade over time, PTFE hoses do not "age" in storage, reducing inventory waste and long-term maintenance costs.
High Temperature & Pressure Rating: Capable of operating in environments exceeding +400°F and pressures up to 3,000 PSI (depending on size).
Integrated Fire Sleeve Compatibility: Often comes factory-shipped with an integral orange fire sleeve (silicone-coated fiberglass) for protection in "fire zones" near the engine.
Precision End Fittings: Features aerospace-standard flared fittings designed for a metal-to-metal leak-proof seal without the need for thread sealant.
Technical Specifications Section
| Specification | Detail |
| Manufacturer | Eaton Aeroquip / Textron Aviation |
| Part Number | AE6695H0180-180 |
| Hose Material | PTFE (Teflon) with Stainless Braid |
| Pressure Rating | High Pressure (3,000 PSI Nominal) |
| Fitting Size | Size -4 or -6 (Check IPC for specific application) |
| Overall Length | Approximately 18.0 inches |
| Compliance | TSO-C75 (Type III High-Pressure Hose) |
Aircraft Compatibility Section
The AE6695H0180-180 is a vital component for high-performance Textron airframes:
Cessna Citation Series (525, 560, 680): Frequently used in the main hydraulic lines for landing gear extension and retraction.
Beechcraft King Air (200/300/350): Utilized in high-pressure brake lines and wing flap hydraulic actuators.
Cessna 208 Caravan: Found in the landing gear hydraulic power pack interfaces.
Hawker 800/900XP: Critical for secondary flight control hydraulic boost systems.
Technical Applications & Safety
In high-pressure hydraulic systems, the AE6695 series is preferred because it does not "balloon" or expand under pressure. This ensures that the pilot's input at the brake pedal or flap handle results in an immediate, crisp response at the actuator.
Safety Warning: Inspect for "Kinking" and "Wire Flare." Because PTFE is a rigid material, it can "kink" if bent beyond its minimum radius during installation. A kinked PTFE hose is structurally compromised and will fail under pressure. Additionally, inspect the area where the hose meets the metal fitting; any "flaring" or broken strands in the stainless steel braid indicate the hose has been over-stressed and must be replaced immediately.
Technical Engineering Insight
The engineering value of the AE6695H0180-180 lies in its Effusion Resistance. In many high-pressure systems, gaseous molecules can migrate through the walls of standard rubber hoses (effusion), leading to fluid aeration and "spongy" controls. The molecular structure of the PTFE liner in the AE6695 series is virtually impermeable to hydraulic fluids like Skydrol and MIL-PRF-83282. This keeps the hydraulic fluid pure and ensures the system remains free of air pockets, which is critical for the high-altitude performance of business jets where low atmospheric pressure can exacerbate fluid aeration.
Installation & Maintenance Addendum
Avoid Torsion: During installation, ensure the "lay line" (the printed text on the hose) is straight. If the lay line is twisted, the hose is under torsional stress, which can cause the fittings to vibrate loose or the wire braid to fatigue.
Minimum Bend Radius: Never force the AE6695H0180-180 into a curve tighter than specified by Eaton Aeroquip. A tight bend creates a "hot spot" where the PTFE liner will eventually crack.
Torque Specifications: Use a calibrated torque wrench. Over-tightening the flared fittings will deform the aluminum or steel seat, creating a permanent leak path that cannot be fixed by further tightening.
