CS-VLA 175 Demonstration of static longitudinal stability

• ED Decision 2003/18/RM found in: CS-VLA Amdt 1 - Very Light Aeroplanes (Mar 2009)

CS-VLA 175 Demonstration of static longitudinal stability ED Decision 2003/18/RM Static longitudinal stability must be shown as follows: (a) Climb. The stick force curve must have a stable slope, at speeds between 15% above and below the trim speed, with - (1) Flaps in the climb position; (2) Landing gear retracted; (3) At least 75% of maximum continuous power; and (4) The aeroplane trimmed for VY, except that the speed need not be less' than 1.4 VS1 or the speed used for showing compliance to the powerplant cooling requirement of [CS-VLA 1041](#_DxCrossRefBm584936649). (b) *Cruise.* The stick force curve must have a stable slope with a range of 15% of the trim speed, but not exceeding the range from 1.3 VS1 to VNE, with - (1) Flaps retracted; (2) Landing gear retracted; (3) 75% of maximum continuous power; and (4) The aeroplane trimmed for level flight. (c) *Approach and landing*. The stick force curve must have a stable slope at speeds throughout the range of speeds between 1.1 VS1 and VFE or 1.8 VS1 if there is no VFE, with - (1) Wing flaps in the landing position; (2) Landing gear extended; (3) Power idle; and (4) The aeroplane trimmed at 1.3 VS1. (See [AMC VLA 173 and AMC VLA 175](#_DxCrossRefBm584936647).)