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<p id=”ydp57c6548fp-10″ data-page=”6123″><span style=”font-size: small;”>Cracks were reportedly detected, located at stringers in the rear fuselage of a number of IS-28B2 sailplanes. The subsequent investigation attributed these cracks to induction of a pre-stress during the manufacturing process of the affected parts.</span></p>
<p id=”ydp57c6548fp-11″ data-page=”6123″><span style=”font-size: small;”>This condition, if not detected and corrected, could lead to reduced structural strength, possibly resulting in a loss of structural integrity of the sailplane.</span></p>
<p id=”ydp57c6548fp-12″ data-page=”6123″><span style=”font-size: small;”>To address this potentially unsafe condition, Aeroclubul Romaniei (AR) issued Service Bulletin (SB) SB-IS-28B2-AR-01 to provide inspection instructions. AR is currently developing modification(s) to provide a design solution for the affected sailplanes.</span></p>
<p id=”ydp57c6548fp-13″ data-page=”6123″><span style=”font-size: small;”>For the reasons described above, this [EASA] AD requires repetitive inspections of the structure of the rear fuselage and, depending on findings, accomplishment of applicable corrective action(s).</span></p>
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<h1 id=”ydpbb8f9185h-3″><span style=”font-size: small;”>SUMMARY:</span></h1>
<p id=”ydpbb8f9185p-3″ data-page=”6123″><span style=”font-size: small;”>We are adopting a new airworthiness directive (AD) for Aeroclubul Romaniei Model IS-28B2 gliders. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cracks at stringers in the rear fuselage of several Model IS-28B2 gliders. We are issuing this AD to require actions to address the unsafe condition on these products.</span></p>
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<h2 id=”ydp1775d4d3h-12″>Costs of Compliance</h2>
<p id=”ydp1775d4d3p-21″ data-page=”6123″>We estimate that this AD will affect 30 products of U.S. registry. We also estimate that it would take about 2 work-hours per product to comply with <span class=”ydp1775d4d3printed-page-wrapper ydp1775d4d3unprinted-element-wrapper”><span id=”ydp1775d4d3page-6124″ class=”ydp1775d4d3printed-page ydp1775d4d3unprinted-element ydp1775d4d3cj-fancy-tooltip ydp1775d4d3document-markup” data-page=”6124″ data-text=”Start Printed Page 6124″ data-tooltip-template=”#print-page-tooltip-template” data-tooltip-data=”{"page": 6124}”><span class=”ydp1775d4d3text”>Start Printed Page 6124</span></span></span>the basic requirements of this AD. The average labor rate is $85 per work-hour.</p>
<p id=”ydp1775d4d3p-22″ data-page=”6124″>Based on these figures, we estimate the cost of this AD on U.S. operators to be $5,100, or $170 per product.</p>
<p id=”ydp1775d4d3p-23″ data-page=”6124″>In addition, we estimate that any necessary follow-on actions would take about 15 work-hours and require parts costing $1,000, for a cost of $2,275 per product. We have no way of determining the number of products that may need these actions.</p>
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