Airworthiness Directives; Cessna Aircraft Company 310, T310, 320, 401, 402, 411, and 421 Series Airplanes

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This document proposes to revise an earlier proposed airworthiness directive (AD) that would have applied to certain Cessna 310, T310, 320, 401, 402, 411, and 421 series airplanes. The previous document would have superseded AD 72-14-08 R1, which currently requires repetitively inspecting the fuel and oil flexible hose lines for leakage or evidence of any damaged or deteriorated hose assembly on the above-referenced airplanes, and replacing any discrepant part. This document would retain from the previous proposed AD the requirement of replacing the fuel and oil flexible hose assemblies in the engine compartment on Cessna 401, 402, and 421 series airplanes with Cessna hose assemblies of improved design, as terminating action for the repetitive inspection requirement of AD 72-14-08-R1; and would provide for the replacement of assemblies of equivalent design to that of the Cessna parts. The proposed AD is the result of the Federal Aviation Administration's policy on commuter class aircraft, which briefly states that, when a modification exists that could eliminate or reduce the number of required critical inspections, the modification should be incorporated. The actions specified by