Summary
We propose to adopt a new airworthiness directive (AD) for certain Learjet Model 45 airplanes. This proposed AD would require inspecting the baggage bay door fire barrier seal for inconel mesh in the fire barrier seal material; for certain airplanes, inspecting the fiberglass doublers for presence of red Room Temperature Vulcanizing (RTV) sealant; and doing related investigative and corrective actions if necessary. This proposed AD results from reports of incorrect external baggage door seal material and door seal sealant as well as incorrect sealant on interior baggage panels used during manufacture of the airplane. We are proposing this AD to prevent the use of door seals and sealant that do not meet flammability requirements, which could result in an uncontrollable and undetected fire within the baggage compartment.