Airworthiness Directives; Raytheon Aircraft Company, Model 390, Premier 1 Airplanes

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The FAA proposes to adopt a new airworthiness directive (AD) for certain Raytheon Aircraft Company, Model 390, Premier 1 airplanes. This proposed AD would require you to inspect the routing and security of the left and right main landing gear (MLG) squat switch wire harness installations for damage, repair any damage or replace components, and reinstall the squat switch wire harness. This proposed AD results from reports of damage to the left and/or right MLG wire harness assemblies, which resulted in various system failures/anomalies due to erroneous air/ground status signals. We are issuing this proposed AD to prevent damage to the wire harnesses, which could result in loss of lift dump, loss of pressurization, loss of transponder responses to interrogations, and failure of other systems utilizing air/ground status signals. This failure could lead to loss of control of the airplane.