ED Decision 2003/13/RM
(a) Movable control surfaces must be installed so that there is no interference between any surfaces or their bracings when one surface is held in any position and the others are operated through their full angular movement. This requirement must be met:
(1) under limit load (positive or negative) conditions for all control surfaces through their full angular range; and
(2) under limit load on the sailplane structure other than control surfaces.
(b) If an adjustable stabilizer is used, it must have stops that will limit its range of travel to that allowing safe flight and landing.
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