The first article of this series referred to the problems and difficulties peculiar to aircraft lubrication because of the wide temperature range to which aircraft lubricants are subjected. An engine lubricant works only for a very short time at sub‐zero temperatures, and spends most of its working life at around 100°C. (212°F.). The converse is true of most airframe lubricants—they spend much of their working life at very low temperatures and only occasionally reach the higher levels. Continuous efficient lubrication at very low temperatures must therefore be provided.
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