Appendix L

• ED Decision 2005/006/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

## Appendix L ED Decision 2005/006/R <table border="1" cellpadding="0" cellspacing="0" width="608"><thead><tr><td rowspan="2" width="209"><p><b>Element of System</b></p></td><td colspan="2" valign="top" width="125"><p><b>Strength Value </b></p></td><td rowspan="2" width="273"><p><b>Remarks</b></p></td></tr><tr><td valign="top" width="60"><p><b>Proof </b></p></td><td valign="top" width="65"><p><b>Ultimate</b></p></td></tr></thead><tr><td valign="top" width="209"><p>Rigid pipes and ducts </p><p>Couplings </p><p>Flexible hoses </p><p>Return line elements </p></td><td valign="top" width="60"><p>1·5 P_W</p><p>1·5 P_W</p><p>2·0 P_W</p><p>– </p></td><td valign="top" width="65"><p>3·0 P_W</p><p>3·0 P_W</p><p>4·0 P_W</p><p>1·5 P_f</p></td><td valign="top" width="273"><p>P_f The maximum pressure applied during failure conditions. </p></td></tr><tr><td valign="top" width="209"><p>Components other than pipes, couplings, ducts or pressure vessels </p></td><td valign="top" width="60"><p>1·5 P_W</p></td><td valign="top" width="65"><p>2·0 P_W</p></td></tr><tr><td rowspan="2" valign="top" width="209"><p>Pressure vessels fabricated from metallic materials.</p><p>(For non-metallic materials see <a href="#_DxCrossRefBm1709821718">CS 25.1436(b)(7)</a>) </p><p>Pressure vessels connected to a line source of pressure </p><p>Pressure vessels not connected to a line source of pressure, e.g. </p><p>emergency vessels inflated from a ground source </p></td><td valign="top" width="60"><p>3·0 P_L or </p><p>1·5 P_L</p></td><td valign="top" width="65"><p>4·0 P_L or </p><p>2·0 P_L</p></td><td rowspan="2" valign="top" width="273"><p>The lower values are conditional upon justification by a fatigue endurance test from which a permissible fatigue life is declared, and upon the ultimate load test being made on the test specimen used for the fatigue life test. </p><p>The lower values are conditional upon justification by a life endurance test of a suitably factored permissible number of inflation/deflation cycles, including temperature fluctuation results in a significant pressure variation, and upon the ultimate load test being made on the test specimen used for the life endurance test.</p><p>For all pressure vessels: </p><p>(1) The minimum acceptable conditions for storage, handling and inspection are to be defined in the appropriate manual. See <a href="#_DxCrossRefBm1709821031">CS 25.1529</a>.</p><p>(2) The proof factor is to be sustained for at least three minutes.</p><p>(3) The ultimate factor is to be sustained for at least one minute. The factor having been achieved, the pressure vessel may be isolated from the pressure source for the remaining portion of the test period.</p></td></tr><tr><td valign="top" width="60"><p>2·5 P_L or </p><p>1·5 P_L</p></td><td valign="top" width="65"><p>3·0 P_Lor </p><p>2·0 P_L</p></td></tr></table> [Amdt 25/1]