Originally Posted by Mr Optimistic
There was a fair amount of discussion centred around arm '36g'. Can't say I followed it or why a piece should be rated according to a maximum inertial load as opposed to x N/mm^2. (...) Can anyone tell me the rated strength of a fastened seat belt and how that relates to the strength of the seat fixing, ...
"Arm 36 g" is named after its function, which is to support an ultimate load equal to 36 times the weight of the rudder, acting parallel to the rudder hinge line. (FAR 25.393)
Design loads for seats and belts are specified in FAR sections 25.561, 25.562 and 25.785(f)(3) which can be found here:
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
regards,
HN39