Checked down to the micron: ODK engineers explained how aircraft engines are tested before release

Specialists from the United Engine Corporation (ODK) explained how aircraft engines undergo the strictest multi-level inspection before release: even a deviation of 10 micrometers — just one tenth of the thickness of a human hair — is considered critical. Such minimal inaccuracies can reduce engine efficiency by 1–2% and cause dangerous vibrations, which is why each unit undergoes detailed diagnostics at all stages of production.

The verification process is divided into three key stages.

1. Micron-level geometry control

Before assembly, each part undergoes a visual inspection for scratches, traces of corrosion, and the condition of connections. Laser scanners and coordinate measuring machines are then used to record deviations in geometry with micron-level accuracy. Without confirmation of compliance with these parameters, the engine is not allowed to proceed to further testing.

2. Non-destructive testing: "X-ray for metal"

To identify internal defects, methods invisible to the naked eye are used:

— eddy current testing — for analyzing the surface of blades;

— radiography — for detecting voids or foreign inclusions inside parts;

— ultrasonic and magnetic particle flaw detection — for finding hidden cracks.

3. Bench testing: a full flight simulation cycle.

At the test bench, the engine undergoes comprehensive validation:

— warm-up and adjustment of all systems;

— start-up and operation across the entire range of modes — from idle to takeoff thrust;

— simulation of takeoff, climb, and cruise flight;

— prolonged operation in various modes to confirm the declared service life and power;

— monitoring of vibrations, temperature fields, pressure in assemblies, fuel consumption, and fuel parameters;

— oil analysis for the presence of metal shavings as a sign of internal wear.

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ODK noted that in engine building there are no secondary parts — every element undergoes the strictest control, since flight safety depends on precision measured in microns.