Boeing 737s must check landing gear for manufacturing defects

US aviation regulators are proposing a new rule for all Boeing 737-600, -700, -800, and -900 series airplanes. This rule requires airlines to check their main landing gear cylinders for improper grinding and replace any affected parts.

This is a routine safety directive, but it highlights ongoing manufacturing quality control issues at Boeing. Airlines will now have to spend time and money inspecting and potentially replacing parts on a widely used aircraft model. This adds to the operational costs for airlines and the reputational costs for Boeing.