Aviation Machinist Mate (AD) Week 1 Practice Test

Oil pressure is the hydraulic force that pushes lubricant through the engine’s internal passages to reach bearing surfaces and other moving parts. This pressure ensures an oil film covers and protects components from metal-to-metal wear. It isn’t a direct measure of the oil’s temperature (that’s a separate oil temperature reading), nor is it a direct measure of viscosity (viscosity affects flow but pressure itself is about the force driving the flow). It also doesn’t indicate how much oil is being consumed. The reading mainly tells you whether there is enough pressure to force oil where it’s needed to lubricate the engine.