Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: * * * * * This assessment showed that the electrical harness of the Fuel Quantity Gauging System (FQGS) is installed in the same routing as the 28 Volts AC, 28 Volts DC, and 115 Volts AC electrical harnesses. A chafing condition between these electrical harnesses and the FQGS harness could increase the surface temperatures of fuel quantity probes and high level sensors inside the fuel tank, resulting in potential ignition source[s] and consequent fuel tank explosion. * * * * * We are issuing this AD to require actions to correct the unsafe condition on these products.