Eastman Skydrol LD-4 Aviation Hydraulic Fluid – 1 Gallon

Skydrol LD-4 is the world’s best-selling Type IV aviation hydraulic fluid, renowned for its long-standing performance, reliability, and safety. Developed by Eastman Chemical Company and introduced in 1977, Skydrol LD-4 remains the trusted hydraulic solution for commercial, military, and business aviation fleets worldwide. Its formulation—unchanged for over 35 years—delivers proven resistance to valve erosion, thermal degradation, and sludge formation.

Whether you’re a pilot, A&P mechanic, or maintenance facility manager, Skydrol LD-4 ensures exceptional hydraulic system performance and reliability under the most demanding flight conditions.

Key Features & Benefits

• Trusted by OEMs and operators worldwide for over four decades

• Excellent thermal stability reduces sludge and acid formation

• Prevents valve erosion to extend hydraulic system life

• Superior deposit control for cleaner operation and longer maintenance intervals

• Low-density formulation helps reduce aircraft weight and improve fuel efficiency

• Long-term, field-proven reliability with no changes to formulation since release

OEM Manufacturer Approvals

Skydrol LD-4 is approved and recommended for use by major aircraft manufacturers, including:

• Airbus (excluding A350)

• Boeing (excluding B787)

• Bombardier

• Gulfstream

• Cessna

• Embraer

• British Aerospace

• COMAC

• ATR

• Fokker

• Lockheed

• Antonov (An-148, 158)

• Beriev (Be-200)

• Ilyushin (IL-86, IL-96)

• Tupolev (Tu-204, Tu-214)

• Sukhoi Superjet 100

• Mitsubishi

Refer to your aircraft maintenance manual (AMM) to confirm fluid compatibility.

Specifications

• Fluid Type: Type IV Phosphate Ester

• Density @ 25°C: 1.005 g/mL

• Viscosity @ 38°C: Approximately 10 cSt

• Pour Point: -62°C (-80°F)

• Flash Point: Approximately 160°C (320°F)

• Compatibility: Suitable with most elastomers, metals, and seals used in aircraft hydraulic systems

• Shelf Life: 3 years from the date of manufacture

Applications

• Commercial jets

• Corporate and business aircraft

• Military aviation platforms

• Rotorcraft

• Ground support and maintenance hydraulic equipment

Handling & Safety Guidelines

Skydrol LD-4 is a fire-resistant hydraulic fluid, but care should still be taken when handling:

• Use nitrile gloves and appropriate eye protection when dispensing or handling the fluid

• Avoid prolonged or repeated skin contact

• Do not allow fluid to come into contact with aircraft paint or plastic surfaces

• Clean up any spills immediately and dispose of waste in accordance with local regulations

• Store in the original, sealed container in a cool, dry environment to avoid moisture contamination

Material Safety Data Sheets (MSDS) are available upon request for detailed handling instructions.

Why Choose Skydrol LD-4?

• Industry-leading performance and trust since 1977

• Field-tested stability and erosion resistance in commercial and defense sectors

• Designed to protect systems and extend hydraulic component life

• Available in convenient 1-gallon containers for quick replenishment

Order with Confidence

Pilot John International is an authorized reseller of Eastman Skydrol products. All inventory is stored and shipped in accordance with manufacturer handling recommendations.

Get your aircraft flight-ready—order Skydrol LD-4 today.
For quotes, compliance documentation, or assistance, contact our sales team.