can anybody tell me where is the documentation or mil-std or
airworthiness directive for determining helicopter main rotor and tail
rotor vibartion limits.

i have a bearingless main rotor and hingeless tail rotor aircraft. i
want to know what are the limits of tail rotor vibrations for a
hingeless tail rotor helicopter ? is it different from articulated
rotors? how about the mail rotor lateral and vertical vibration limits.

i searched mil-std-810f, mil-std-810d as wee as aeronautical design
standard ADS-27A -SP.

The information i got was not clear.

thank u.