Airworthiness Directives; Piper Aircraft Corporation PA-28 and PA-32 Series Airplanes

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This document proposes to supersede AD 76-25-06, which currently requires replacing certain engine oil hoses on Piper Model PA-28-140 airplanes, and inspecting for a minimum clearance between the oil hose assemblies and the front exhaust stacks and adjusting if proper clearance is not obtained. The proposed action would maintain the clearance inspection and hose replacement, require this inspection and replacement to be repetitive, and extend the applicability to include PA-32 series and other PA-28 series airplanes. It would also provide the option of installing an approved TSO-C53a, Type D, hose assembly as terminating action for the repetitive inspection requirement. Numerous incidents/accidents caused by oil cooler hose rupture or failure on the affected airplanes prompted the proposed action. The actions specified by the proposed AD are intended to prevent these hoses from failing or rupturing, which could result in engine stoppage and subsequent loss of control of the airplane.