Airworthiness Directives; Hawker Beechcraft Corporation Model BH.125 Series 600A Airplanes and Model HS.125 Series 700A Airplanes Modified in Accordance With Supplemental Type Certificate (STC) SA2271SW

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We propose to adopt a new airworthiness directive (AD) for certain Hawker Beechcraft Corporation Model BH.125 series 600A airplanes and Model HS.125 series 700A airplanes. This proposed AD would require inspecting the wiring diagrams containing the cockpit blowers and comparing with the current airplane configuration, and reworking the wiring if necessary. This proposed AD results from a report indicating that a blower motor of the cockpit ventilation and avionics cooling system seized up and gave off smoke. We are proposing this AD to prevent smoke and fumes in the cockpit in the event that a blower motor seizes and overheats due to excessive current draw.