Eastman Skydrol LD-4 Type IV Fire Resistant Aviation Hydraulic Fluid, 5 Gallon, LD4-5GL
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Skydrol LD-4 is a Type IV, low density, phosphate ester based fire resistant hydraulic fluid for aircraft hydraulic systems. It contains an anti-erosion additive and an acid scavenger to prevent valve erosion and control deposits. Supplied as one 5 gallon pail.
- Introduced in 1977; Eastman states the formulation has not changed since its introduction
- Eastman lists approvals from Airbus, Boeing, Bombardier, Embraer, Gulfstream, Cessna and others (see specifications); not approved for the Airbus A350, A380 or Boeing 787
- Viscosity 10.65 to 11.65 cSt at 38 °C and 2000 cSt maximum at -54 °C
- Fire point 177 °C (350 °F) minimum and autoignition temperature 400 °C (752 °F) minimum
- Approvals change over time; confirm against the aircraft CMM or QPL before use
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