Airworthiness Directives; Bombardier Model DHC-8-100, DHC-8-200, and DHC-8-300 Series Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-100, DHC-8-200, and DHC-8-300 series airplanes. This AD requires repetitive inspections of the fluorescent light tube assemblies of the cabin, lavatory, and sidewall, and corrective actions if necessary. This AD also provides for optional terminating action for the repetitive inspections. This AD results from reports of overheating due to arcing between the fluorescent tube pins and the lamp holder contacts. The tubes had not been properly seated during installation. We are issuing this AD to prevent fumes, traces of visible smoke, and fire at the fluorescent light tube assembly.