AMC 22.173(b) Static longitudinal stability

• ED Decision 2003/13/RM found in: Sailplane Rule Book - Part-SAO Part-SFCL CS-22 (Nov 2022)

AMC 22.173(b) Static longitudinal stability ED Decision 2003/13/RM (1) In flight demonstration, the sailplane should be trimmed in steady flight and the speed should be increased by approximately 20% by moving the control column. The force on the column should then be relaxed very slowly, so as to avoid speed oscillation, and the speed at which the sailplane settles should be noted. The test should be repeated with the speed being decreased by approximately 20%. (2) Suitable minimum and maximum trimmed speeds are: (a) Wing-flaps neutral (see [AMC 22.335](#_DxCrossRefBm2056272075))*:* 1.3 VS1 and the maximum trim speed but not exceeding 0.84 VNE. (b) Wing-flaps in the landing position: 1.3 VS0 and the minimum trim speed, but not exceeding 0.84 VFE. (3) Where no in-flight trimming device is fitted, the test should be made at the trimmed speed. In such case, the speed at which the force on the column is relaxed need not exceed VNE or VFE as appropriate, and need not be less than the minimum speed for steady unstalled flight.