HYDRAUNYCOIL FH 51

Type: Hydraulic fluid

Implementation Standards: MIL-PRF-5606 H

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Use: Hydraunycoil FH 51 is used in the main hydraulic system of military aircraft (jet fighters, transport aircraft, helicopters) and civil aircraft of Russian or Ukrainian origin (Tupolev, Antonov, Mig, Sukhoi, Mil, Ilyushin).

Hydraunycoil FH 51 has an extremely wide operating temperature range (from -54°C to +135°C in air-tight circuits and -54°C to +90°C in open circuits) with a viscosity index exceeding 300. It is microfiltered and is supplied with a controlled level

1. Product Overview & Development Background

NYCO Hydraunycoil FH-51 is a specialized aviation hydraulic fluid developed by France’s NYCO for extreme low-temperature environments. As a core product in the Hydraunycoil series, it is engineered for precision hydraulic systems such as aircraft landing gear and flight control systems. It balances low-temperature fluidity, high-temperature stability, and material compatibility, making it widely applicable in civil and military aviation.

2. Key Technical Parameters & Performance

Physicochemical Properties

Parameter	Specification	Test Standard/Notes
Temperature Range	-60°C to 135°C (short-term 150°C)	MIL-PRF-5606
Low-Temperature Fluidity	Kinematic viscosity ≤2500 mm²/s at -54°C	Ensures cold-start reliability
Flash Point	≥104°C	GB/T 261 (closed cup)
Density (20°C)	~839 kg/m³	GB/T 1884
Cleanliness	ISO 4406 Class 14/12/10	Reduces system clogging risks
Acid Value	≤0.098 mgKOH/g	GB/T 7304

Core Performance Advantages

Broad Temperature Adaptability:
- Maintains fluidity at -60°C, preventing hydraulic system freeze in extreme cold.
- Short-term tolerance up to 150°C; oxidation stability >30 hours (tested at 100°C), minimizing thermal degradation.
Material Compatibility:
- Non-corrosive to metals (copper strip corrosion rating: 1a), rubber (swelling rate ≤5%), and seals, extending component lifespan.
Contamination Resistance & Oxidation Stability:
- Strict particle control (ISO 4406 Class 14/12/10) combined with antioxidant additives reduces sludge and deposits.

3. Applications & Industry Positioning

Aviation

Civil Aircraft: Landing gear and flap control systems in Boeing 737/747, Airbus A320/A380, etc.
Military Equipment: High-precision hydraulic actuators in transports (C-130) and helicopters (Black Hawk).
Replacement Advantage: Gradually replaces older fluids (e.g., MIL-H-5606E), with compatibility validated by global aircraft manufacturers.

Industrial & Specialized Equipment

High-Altitude/Extreme-Cold Machinery: Hydraulic systems in plateau construction and polar exploration equipment.
Ground Support: Low-temperature lubrication for airport equipment (e.g., jet bridge hydraulics).

4. Market Competitiveness & Comparisons

Comparison with Competing Products

Product	NYCO FH-51	MIL-H-5606E (Mineral Oil)	Shell AeroShell Fluid 41 (Synthetic Ester)
Temperature Range	-60°C~135°C	-54°C~135°C	-54°C~200°C
Eco-Friendliness	Complies with GJB 1177A-2013	Low biodegradability	Fully synthetic, low toxicity
Cost	Import-substitution pricing (~60% of competitors)	Low	High (1.5–2× FH-51)
Use Cases	Dual civil-military, mid-low temp scenarios	Legacy system maintenance	Ultra-high temp/long-duration operations

Market Positioning

Cost-Effectiveness: An upgraded MIL-PRF-5606 alternative with broad temperature performance and competitive pricing.
Limitations: Lower high-temperature tolerance vs. full synthetics (e.g., Shell Fluid 41); requires monitoring under heat stress.

5. Usage & Maintenance Guidelines

Refilling & Storage:
- Compatibility: Do not mix with mineral/silicone oils; clean systems thoroughly before refilling.
- Storage: Store sealed in cool, dark conditions (10°C–25°C); shelf life: 3 years (unopened).
Maintenance Intervals:
- Replace annually or every 2000 flight hours (shorten to 1000 hours in extreme conditions).
- Replace filters and test critical parameters (acid value, moisture content).

6. Technological Evolution & Future Trends

Synthetic Upgrades:
NYCO is developing PAO (polyalphaolefin)-based synthetic variants targeting 180°C continuous operation while retaining low-temperature fluidity.
Eco-Friendly Improvements:
Phasing out sulfur/phosphorus additives for ICAO CORSIA-compliant biodegradable formulas to reduce environmental impact.

7. Conclusion & Selection Guidance

Recommended For:

Aviation hydraulic systems requiring broad temperature adaptability (-60°C~135°C).
Cost-sensitive civil-military projects replacing imported fluids.

Not Recommended For:

Hydraulic circuits exposed to prolonged >150°C heat (opt for full synthetics).
Strong acid/alkali environments (requires custom corrosion-resistant formulas).

NYCO FH-51 holds a key position in aviation hydraulics due to its low-temperature performance, material compatibility, and cost efficiency, particularly for operations in polar or high-altitude regions. Future synthetic advancements will strengthen its competitiveness in the global market.

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