CS 22.561 General

• ED Decision 2008/008/R found in: Sailplane Rule Book - Part-SAO Part-SFCL CS-22 (Nov 2022)

CS 22.561 General ED Decision 2008/008/R (See [AMC 22.561](#_DxCrossRefBm2056272174)) (a) The sailplane although it may be damaged in emergency landing conditions must be designed as prescribed in this paragraph to protect each occupant under those conditions. (b) The structure must be designed to give each occupant every reasonable chance of escaping serious injury in a crash landing when proper use is made of belts and harnesses provided for in the design, in the following conditions: (1) The occupant experiences, separately, ultimate inertia forces corresponding to the accelerations shown in the following: <table border="1" cellpadding="0" cellspacing="0" width="529"><tr><td valign="top" width="255"><p>Upward </p></td><td valign="top" width="274"><p>7.5 g </p></td></tr><tr><td valign="top" width="255"><p>Forward </p></td><td valign="top" width="274"><p>15.0 g </p></td></tr><tr><td valign="top" width="255"><p>Sideward </p></td><td valign="top" width="274"><p>6.0 g </p></td></tr><tr><td valign="top" width="255"><p>Downward </p></td><td valign="top" width="274"><p>9.0 g </p></td></tr></table> (2) An ultimate load of 9 times the weight of the sailplane acting rearwards and upwards at an angle of 45° to the longitudinal axis of the sailplane and sideward at an angle of 5° acts on the forward portion of the fuselage at a suitable point not behind the pedals. (See [AMC 22.561(b)(2)](#_DxCrossRefBm2056272173)) (c) Each sailplane with a retractable landing gear must be designed to protect each occupant in a landing with wheel(s) retracted under the following conditions: (1) a downward ultimate inertia force corresponding to an acceleration of 3 g; (2) a coefficient of friction of 0.5 at the ground. (d) Except as provided in [CS 22.787](#_DxCrossRefBm2056272172), the supporting structure must be designed to restrain, under loads up to those specified in sub-paragraph (b)(1) of this paragraph each item of mass that could injure an occupant if it came loose in a crash landing. (e) For a powered sailplane with the engine located behind and above the pilot’s seat, an ultimate inertia load of 15 g in the forward direction must be assumed. [Amdt 22/1]