Which step is essential after deburring a hole?

After deburring a hole, it is essential to check for sharp edges. Deburring is the process of removing the burrs or rough edges left on the metal after machining operations such as drilling. The primary objective is to ensure that the edges are smooth and safe to handle, as sharp edges can lead to injuries or damage to components that come into contact with them.

By checking for sharp edges, you ensure that the hole fits correctly into its intended application, and it minimizes risks of cuts and other hazards during assembly or subsequent operations. Ensuring the hole is free from sharp edges also contributes to the overall quality of the assembly, leading to safer and more reliable aircraft components.

The other steps mentioned, while possibly relevant in some contexts, are not essential immediately following the deburring process. For instance, re-drilling may not be needed unless the hole is improperly sized, applying a protective coating is generally done later in the process, and measuring the hole diameter again may be part of a different quality control step.