What is the MIL-SPEC number for hydraulic fluid used in the F/A-18 E/F?

The correct specification for hydraulic fluid used in the F/A-18 E/F is MIL-PRF-83282. This fluid is designed to operate effectively in the high-performance environment of military aircraft, allowing for optimal hydraulic system performance under extreme conditions, such as temperature fluctuations and varying pressures. It contains additives to prevent corrosion, limit foaming, and enhance thermal stability, which are crucial for the reliability and safety of the aircraft during operations.

The other specifications listed, while relevant to other applications, do not match the requirements for the F/A-18 E/F's hydraulic system. MIL-PRF-83281 is similar but has different performance criteria; MIL-PRF-23699 is specified for turbine engine oil; and MIL-PRF-5606 is for a different type of hydraulic fluid used in various military aircraft. Understanding the exact specifications and their applications ensures that maintenance and operations align with the stringent standards required for military aviation.