Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model CL-600-2B19 series airplanes. This proposal would require inspection of certain installed electrical relays to determine whether they have certain manufacturing date codes, and replacement of the electrical relays with those date codes with new relays with different manufacturing date codes. This action is necessary to prevent the failure of an electrical relay due to a defective moving blade assembly, which could result in the inability to generate electrical power from the emergency system, if needed. This action is intended to address the identified unsafe condition.