1. The problem statement, all variables and given/known data The landing gear of an aircraft is composed of a main leg OA (with a weight including the wheel is 1000N to G) and two secondary links BC and 50cm long each CD. The DC link forms an angle θ of 30 degrees with the vertical. a) Add the rotational equilibrium equation with respect to fulcrum A of forces acting (only) on the leg OA and determine the force exerted by the DC link D. Pic in attachment. 2. Relevant equations 3. The attempt at a solution sin(x)=40/80 = 30 degree Total forces X : DC *cos(30) - w*sin(30) = 0 Total forces in Y: DA+DC*sin(30)-w*cos(30)=0 Moment of force(total) = 0.80m*DC*cos(30)+0-w*sin(30) = 0 I have a problem with my Moment of force equation, I am missing something or something is wrong because my calculator gives me an error "FALSE". Took a good 2 hours to try to figure out by my own but I did not find my error. Thank you for helping.