MIL-H-83282C, MILITARY SPECIFICATION: HYDRAULIC FLUID, FIRE RESISTANT, SYNTHETIC HYDROCARBON BASE, METRIC, NATO CODE NUMBER H-537 (25 MAR 1986) (S/S BY MIL-PRF-83282D)., This specification covers the requirements for a synthetic hydrocarbon-basehydraulic fluid for use in the temperature range of -40掳 to +205掳C. This hydraulic fluid isidentified by NATO Code Number H-537 (see 6.6).