Eastman Skydrol LD-4 Aviation Hydraulic Fluid – 5 Gallon

Eastman Skydrol LD-4 in a 5-gallon pail is the go-to solution for professional aviation maintenance operations requiring larger volumes of fluid for routine servicing and hydraulic system overhauls. First introduced in 1977, LD-4 is the world’s leading Type IV aviation hydraulic fluid, known for delivering superior system cleanliness, valve erosion resistance, and thermal stability.

This phosphate ester-based fluid is engineered for long-term performance and trusted by aircraft OEMs across a wide range of fleets. Whether you're maintaining a regional jet or managing hangar operations, Skydrol LD-4 ensures your systems run efficiently and reliably in the most demanding environments.

Key Features & Benefits

• Proven reliability in global commercial and military aviation for over four decades

• Excellent thermal stability that helps minimize the formation of acids, sludge, and varnish

• Resists valve erosion, extending the lifespan of hydraulic components

• Advanced deposit control for cleaner system operation and lower maintenance needs

• Lightweight, low-density formulation helps reduce aircraft weight and improve fuel economy

• Fully approved by a broad range of aircraft manufacturers and OEMs

OEM Manufacturer Approvals

Skydrol LD-4 is qualified and recommended by leading aerospace manufacturers:

• Airbus (excluding A350)

• Boeing (excluding B787)

• Bombardier

• Gulfstream

• Cessna

• Embraer

• British Aerospace

• ATR

• COMAC

• Fokker

• Lockheed

• Antonov (An-148, 158)

• Beriev (Be-200)

• Ilyushin (IL-86, IL-96)

• Tupolev (Tu-204, Tu-214)

• Sukhoi Superjet 100

• Mitsubishi

Always refer to your aircraft maintenance manual (AMM) before use.

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: Compatible with most elastomers, seals, and metals used in aircraft hydraulic systems

• Shelf Life: 3 years from date of manufacture

Applications

• Commercial aviation (airliners and cargo aircraft)

• Military platforms

• Business jets and corporate aircraft

• Rotorcraft

• Hangar-based maintenance operations

• Hydraulic test stands and GSE equipment

Handling & Safety Guidelines

Safe handling practices are essential when working with phosphate ester-based fluids:

• Wear nitrile gloves and safety goggles when handling the fluid

• Avoid contact with painted surfaces or plastics, which may be damaged by Skydrol

• Clean spills immediately and dispose of waste in accordance with regulatory requirements

• Store in original sealed container in a dry, cool area, away from contaminants and moisture

• Do not reuse containers to prevent contamination

Material Safety Data Sheets (MSDS) are available upon request.

Why Choose the 5-Gallon Option?

• Ideal for high-volume users and hangar maintenance crews

• Cost-effective container size for routine service operations

• Reduced downtime with fewer refills compared to smaller containers

• Meets the strict performance demands of commercial aviation environments

Order from Pilot John International

Pilot John International is your trusted source for certified Skydrol hydraulic fluids and aviation MRO supplies. All containers are stored per manufacturer specifications and ship quickly to meet your operational needs.

Secure your 5-gallon pail of Skydrol LD-4 today and keep your fleet operating at peak performance.
For quotes, bulk orders, or technical documentation, contact our sales support team.