Eastman Skydrol LD4 Hydraulic Fluid

Eastman Skydrol LD4 Hydraulic Fluid

Eastman Skydrol LD4 is a widely used Type IV Class I fire-resistant phosphate ester aviation hydraulic fluid designed for high-performance commercial and military aircraft systems. Introduced in 1977, it has become the industry benchmark Type IV hydraulic fluid and is trusted by operators worldwide.

Skydrol LD4 meets BAMS 564-003 Type IV Class I Grade A, BMS 3-11P Type IV Class I and NSA 307110 Type IV LD Rev N specifications. It offers low density for weight savings, superior thermal stability, valve erosion protection, and excellent deposit control, helping extend system life and reduce maintenance costs.

Key Features & Benefits

• Fire-resistant phosphate ester aviation hydraulic fluid
• Meets BMS 3-11P Type IV Class I and BAMS 564-003 Type IV Class I Grade A
• Low density formulation to help reduce aircraft weight
• Excellent thermal stability and deposit control
• Valve erosion protection for longer system component life
• Proven long-term use by airlines and OEMs worldwide

Typical Applications

• Commercial and military aircraft hydraulic systems
• Primary and secondary flight control hydraulics
• Maintenance environments requiring Type IV performance and long fluid life