Bombardier planes must check for swapped parts in a critical flight control

US aviation regulators are proposing a new rule for all Bombardier BD-100-1A10 airplanes. This rule requires operators to verify the serial numbers of horizontal stabilizer trim actuators, which control the plane's pitch, and replace them if they contain incorrect parts.

This proposed rule means that every operator of a specific Bombardier jet must now perform a detailed inspection of a critical flight control component. It addresses a manufacturing oversight where incorrect parts were reinstalled during overhauls, which could lead to control issues. This kind of directive highlights the continuous, granular oversight required to maintain aviation safety, often driven by specific, small failures.