What is an example of an engine inspection technique?

The correct answer is the use of an engine borescope, which is a valuable inspection technique for assessing engine components without requiring disassembly. A borescope is an optical device that allows technicians to visually inspect the internal areas of an engine, such as the combustion chamber, valves, and piston head, through a small access point. This technique provides critical insights into the condition of engine components, helping to identify issues like wear, damage, or foreign object ingestion without the extensive labor and costs associated with a full teardown.

In contrast, while engine tear down and engine pressure testing are legitimate inspection methods, they involve more invasive procedures. An engine tear down requires disassembling the engine, which can be time-consuming and costly. Engine pressure testing, which assesses seals and structural integrity, might miss internal issues without the visual confirmation available through borescopy. A compression check measures the engine's ability to maintain pressure in the cylinders but does not provide detailed visual insights into the engine's internal conditions like a borescope would. Thus, the engine borescope stands out as a highly efficient and effective inspection technique among the options.